Abstract: The present invention provides a nonaqueous electrolyte secondary cell having a positive electrode comprising mainly of a positive electrode active material, a negative electrode, and a nonaqueous electrolyte. The positive electrode active material is a lithium-containing transition metal composite oxide of a hexagonal crystal system that includes a compound represented by the general formula LiCo1-xMxO2, where M is at least one species selected from the group consisting of V, Cr, Fe, Mn, Ni, Al, and Ti, and x is a decimal number in a range 0<x<1, magnesium, and halogen. In a nonaqueous electrolyte secondary cell having such a construction, the high-temperature characteristics are improved without reducing the cell capacity.

Abstract: A rechargeable battery having an anode comprising a powdery composite material said powdery composite material comprising a plurality of powdery composites having a structure comprising a core whose surface is covered by a coat layer, said core comprising an alloy particle of an alloy capable of reversibly storing and releasing hydrogen as a main component, said alloy containing at least one kind of a metal element selected from the group consisting of Zr, Ti and V as a main constituent element, and said coat layer comprising a hydrous oxide (including a hydroxide) of a metal element having an affinity with oxygen which is greater than that of any of said metal elements as the main constituent element of said alloy.

Abstract: The present invention provides a positive electrode active material containing a composite oxide having a composition represented by a structural formula (1) given below: Lix(Ni1-yMe1y)(O2-zXz)+A??(1)

Abstract: A crystal which can be employed as the active material of a lithium-based battery has an empirical formula of Lix1A2Ni1-y-zCoyBzOa, wherein “x1” is greater than about 0.1 and equal to or less than about 1.3, “x2,” “y” and “z” each is greater than about 0.0 and equal to or less than about 0.2, “a” is greater than about 1.5 and less than about 2.1, “A” is at least one element selected from the group consisting of barium, magnesium, calcium and strontium and “B” is at least one element selected from the group consisting of boron, aluminum, gallium, manganese, titanium, vanadium and zirconium.

Abstract: Active metal anodes can be protected from deleterious reaction and voltage delay in an active metal anode-solid cathode battery cell can be significantly reduced or completely alleviated by coating the active metal anode (e.g., Li) surface with a thin layer of a chemical protective layer incorporating aliovalent (multivalent) anions on the lithium metal surface. Such an aliovalent surface layer is conductive to Li-ions but can protect lithium metal from reacting with oxygen, nitrogen or moisture in ambient atmosphere thereby allowing the lithium material to be handled outside of a controlled atmosphere, such as a dry room. Particularly, preferred examples of such protective layers include mixtures or solid solutions of lithium phosphate, lithium metaphosphate, and/or lithium sulphate. These protective layers can be formed on the Li surface by treatment with diluted solutions of the following acids: H3PO4, HPO3 and H2SO4 or their acidic salts in a dry organic solvent compatible with Li by various techniques.

Abstract: Voltage delay in an active metal anode/liquid cathode battery cell can be significantly reduced or completely alleviated by coating the active metal anode (e.g., Li) surface with a thin layer of an inorganic compound with Li-ion conductivity using chemical treatment of Li surface. Particularly, preferred examples of such compounds include lithium phosphate, lithium metaphosphate, and/or their mixtures or solid solutions with lithium sulphate. These compounds can be formed on the Li surface by treatment with diluted solutions of the following individual acids: H3PO4, HPO3 and H2SO4, their acidic salts, or their binary or ternary mixtures in a dry organic solvent compatible with Li, for instance in 1,2-DME; by various deposition techniques. Such chemical protection of the Li or other active metal electrode significantly reduces the voltage delay due to protected anode's improved stability toward the electrolyte.

Abstract: The present invention relates to metal oxides containing multiple dopants.

Abstract: The invention presents an air battery comprising a battery container having a surface in which air pores are formed, an electrode group provided in the battery container and including an air positive electrode, and a laminated sheet including a barrier film which is provided between the surface and the air positive electrode, and of which oxygen permeation coefficient is 1×10−14 mol·m/m2·sec·Pa or less, and a gap holding member which is laminated on the barrier film and is opposite to the air positive electrode, and the gap holding member comprising at least one selected from the group consisting of a porous film, a nonwoven fabric, and a woven fabric, wherein the air pores of the battery container are closed by the laminated sheet.

Abstract: A method for producing a negative electrode material for a non-aqueous electrolyte secondary battery is disclosed: which includes a step of applying a shearing force to an intermetallic compound under the presence of nitrogen. The intermetallic compound contains element(A) which reacts with nitrogen and forms a nitride, but does not react with lithium, and element(B) which does not react with nitrogen, but reacts with lithium, thereby forming a mixture containing a nitride of element(A) and a substance of element(B).

Abstract: A battery with a high battery voltage at charging and improved energy density is provided. A cathode (12) and an anode (14) are laminated with a separator (15) sandwiched therebetween which is impregnated with an electrolyte. The cathode (12) has a cathode active material including a lithium composite oxide which contains lithium, at least either cobalt or nickel, and oxygen. The battery voltage at charging is 4.25 V or more. The total amount of lithium carbonate and lithium sulphate in the cathode (12) to the cathode active material is 1.0 wt % or less, a concentration of protic impurities in the electrolyte, which is converted to a mass ratio of protons to the electrolyte, is 20 ppm or less, or moisture content in the electrolyte is 20 ppm mass ratio or less to the electrolyte. This inhibits metal eluting from the lithium composite oxide even at high voltages.

Abstract: A positive electrode active material for lithium-ion rechargeable batteries of general formula Li1+xNi&agr;Mn&bgr;A&ggr;O2 and further wherein A is Mg, Zn, Al, Co, Ga, B, Zr, or Ti and 0<x<0.2, 0.1≦&agr;≦0.5, 0.4≦&bgr;≦0.6, 0≦&ggr;≦0.1 and a method of manufacturing the same. Such an active material is manufactured by employing either a solid state reaction method or an aqueous solution method or a sol-gel method which is followed by a rapid quenching from high temperatures into liquid nitrogen or liquid helium.

Abstract: Provided are a cathode material capable of improving battery characteristics by improving its structural stability, a method of manufacturing the cathode material, and a battery using the cathode material. A cathode comprises a complex oxide represented by LiaMnbCrcAl1−b−cOd or Li1+e(MnfCrgM1−f−g)1−eOh. The values of a through h are within a range of 1.0<a<1.6, 0.5<b+c<1, 1.8<d<2.5, 0<e<0.4, 0.2<f<0.5, 0.3<g<1, f+g<1 and 1.8<h<2.5, and M is at least one kind selected from the group consisting of Ti, Mg and Al. The crystalline structure can be stabilized by Ti, Mg or Al, and charge-discharge cycle characteristics can be improved. Moreover, the charge capacity can be improved by an excessive amount of lithium, and even after charge, a certain amount of lithium remains in the crystalline structure, so the stability of the crystalline structure can be further improved.

Abstract: A hydrogen storage material has a magnesium-containing intermetallic compound which can form a hydride with hydrogen. The intermetallic compound has an alloy of magnesium and a trivalent metal selected from the group of Sc, Y, La and the rare earth elements. The hydrogen storage material can further have a catalytically active material.

Abstract: Disclosed is a positive electrode active material for a nonaqueous electrolyte secondary battery having at least a lithium-transition metal composite oxide of a layer structure, in which an existence ratio of at least one selected from the group consisting of elements which may become tetravalent and magnesium is 20% or more on a surface of the lithium-transition metal composite oxide. By use of this positive electrode active material, a nonaqueous electrolyte secondary battery having excellent battery characteristics, specifically, having excellent high rate characteristics, cycle characteristics, low-temperature characteristics, thermal stability, and the like, under the even more harsh environment for use can be realized.

Abstract: The present invention provides a 12CaO.7Al2O3 compound containing an O2− ion radical and/or an O− ion radical in a high concentration of 1020 cm−3 or more. This compound can be used as an oxidization catalyst, antibacterial agent, ion conductor, or electrode material for solid-oxide fuel cells.

Abstract: Electrode active materials comprising lithium or other alkali metals, a transition metal, and a phosphate or similar moiety, of the formula: Aa+xMbP1−xSixO4 wherein (a) A is selected from the group consisting of Li, Na, K, and mixtures thereof, and 0<a<1.0 and 0≦x≦1; (b) M comprises one or more metals, comprising at least one metal which is capable of undergoing oxidation to a higher valence state, where 0<b≦2; and wherein M, a, b, and x are selected so as to maintain electroneutrality of the compound. In a preferred embodiment, M comprises at least one transition metal selected from Groups 4 to 11 of the Periodic Table. In another preferred embodiment, M comprises M′cM″d, where M′ is at least one transition metal from Groups 4 to 11 of the Periodic Table; and M″ is at least one element from Groups 2, 3, 12, 13, or 14 of the Periodic Table, and c+d=b. Preferably, 0.1≦a≦0.8.

Abstract: A method for producing a cathode active material having superior cell characteristics through single-phase synthesis of a composite material composed of a compound represented by the general formula LixFe1-yMyPO4 and a carbon material positively and a method for producing a non-aqueous electrolyte cell employing the so produced cathode active material. To this end, the cathode active material is prepared by a step of mixing the starting materials for synthesis of the compound represented by the general formula LixFe1-yMyPO4, a step of milling a mixture obtained by the mixing step, a step of compressing the mixture obtained by the mixing step to a preset density and a step of sintering the mixture obtained by the compressing step. A carbon material is added in any one of the above steps prior to the sintering step. The density of the mixture in the compressing step is set to not less than 1.71 g/cm3 and not larger than 2.45 g/cm3.

Abstract: The present invention provides a positive electrode, which has a large volume capacity density, high safety, and is excellent in the coating uniformity, the charge and discharge cyclic durability and the low-temperature properties.

Abstract: A cathode active material for a non-aqueous electrolyte secondary cell having a c-axis length of lattice constant of 14.080 to 14.160 Å, an average particle size of 0.1 to 5.

Abstract: A non-aqueous electrolyte cell having improved cyclic characteristics at elevated temperatures. The non-aqueous electrolyte cell includes a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode contains, as a positive electrode active material, a lithium transition metal composite oxide represented by the general formula LiCoxAyBzO2 where A denotes at least one selected from the group consisting of Al, Cr, V, Mn and Fe, B denotes at least one selected from the group consisting of Mg and Ca and x, y and z are such that 0.9≦x<1, 0.001≦y≦0.05 and 0.001≦z≦0.05.

Abstract: A cathode active material for a lithium-ion secondary battery includes a spinel lithium manganese composite oxide expressed by the general formula: Lia(NixMn2−x−q−rQqRr)O4, wherein 0.4≦x≦0.6, 0<q, 0≦r, x+q+r<2, 0<a<1.2, Q is at least one element selected from the group consisting of Na, K and Ca, and R is at least one element selected from the group consisting of Li, Be, B, Mg and Al.

Abstract: A lithium ion secondary battery having high energy density and of excellent safety, and a cathode active material used therefor are provided. The cathode active material is a Li-containing composite oxide comprising a plurality of transition metal elements selected from Cr, Mn, Fe, Co, Ni and Cu, in which the composition of the transition metal elements is in a range not inclined to particular transition metal elements. The composite oxide having a crystal structure in which the range of an angle &bgr; formed between a axis and b axis of the crystallographic structure is controlled as: 90° <&bgr;≦110°. The composite oxide is used as the cathode active material of a lithium ion secondary battery.

Abstract: The invention concerns a process for producing a spinel compound of formula Li4Ti5O12, comprising a step of preparing a mixture of an organo-lithium compound selected from lithium alcoholates with an organo-titanium compound selected from titanic acid esters, in a liquid medium, and a step of hydrolyzing the mixture of said compounds. The invention also concerns a Li4Ti5O12 particulate material which may be produced according to the previous cited process and which has a BET surface area of at least 10 m2/g. The material is particularly useful in the manufacture of Lithium Ion batteries.

Abstract: This invention relates to electrolytes containing ethyl methyl carbonate as a solvent for use in lithium cells or batteries containing metal phosphate cathodes. The invention further relates to electrolytes comprising ethyl methyl carbonate, ethylene carbonate, diethyl carbonate and propylene carbonate for use in lithium cells or batteries with metal phosphate cathodes, and to batteries employing such electrolytes. The electrolytes of the present invention are an improvement over other electrolytes used in lithium cells or batteries with metal phosphate cathodes in that the electrolytes are less prone to gassing and therefore have better shelf stability.

Abstract: Electrode active materials comprising two or more groups of particles having differing chemical compositions, wherein each group of particles comprises a material selected from:

Abstract: An active material for positive electrode for a non-aqueous electrolyte secondary battery comprises a lithium-metal composite oxide that is expressed by the general formula of Lix(Ni1-yCoy)1-zMzO2 (where 0.98≦x≦1.10, 0.05≦y≦0.4, 001≦z≦0.2, and where M is at least one metal element selected from the group of Al, Mg, Mn, Ti, Fe, Cu. Zn and Ga), and where the SO4 ion content is in the range from 0.4 weight % to 2.5 weight %, and the occupancy rate of lithium found from the X-ray diffraction chart and using Rietveld analysis is 98% or greater, and the carbon amount measured by way of the high frequency heating-infrared adsorption method is 0.12 weight % or less, and that the Karl Fischer water content due to heating at 180° C. be 0.2 weight % or less.

Abstract: As a positive electrode active material, a lithium transition metal complex oxide having a layered rock-salt structure containing lithium (Li) and containing magnesium atoms (Mg) substituted for part of lithium atoms (Li) is used. The lithium transition metal complex oxide is formed by chemical or electrochemical substitution of Mg atoms for part of Li atoms in LiCoO2, LiMnO2, LiFeO2, LiNiO2, or the like. A cell is prepared in which a negative electrode 2 and a positive electrode 1 including the lithium transition metal complex oxide (positive electrode active material) are disposed in a non-aqueous electrolyte 5 including a lithium salt, and part of Li in the lithium transition metal complex oxide is extracted by discharging the cell. Then, the electrolyte including Li is replaced with an electrolyte including Mg; and the cell is discharged, so that Mg atoms are substituted for the part of Li atoms in the lithium transition metal complex oxide.

Abstract: A cathode active material for a secondary battery including a lithium-manganese composite oxide having a spinel structure and represented by the following general formula (I), Lia(MxMn2-x-y-zYyAz)(O4-wZw) (I), wherein 0.5≦x≦1.2, 0≦y, 0≦z, x+y+z<2, 0≦a≦1.2 and 0≦w≦1; M contains at least Co and may further contains at least one element selected from the group consisting of Ni, Fe, Cr and Cu; Y is at least one element selected lo from the group consisting of Li, Be, B, Na, Mg, Al, K and Ca; A is at least one of Ti and Si; and Z is at least one of F and Cl. When the cathode active material for the secondary battery is used as the cathode for the a secondary battery, a higher operating can be realized while suppressing the reliability reduction such as the capacity decrease after the cycles and the deterioration of the crystalline structure at a higher temperature.

Abstract: The present invention relates to metal oxides containing multiple dopants.

Abstract: Disclosed is a positive active material for a rechargeable lithium battery.

Abstract: A method of manufacturing a non-aqueous electrolyte secondary battery is provided wherein the positive electrode is made from a lithium-metal composite oxide represented by the general formula Lix(Ni1-y, Coy)1-zMzO2 (0.98≦x≦1.10, 0.05≦y≦0.4, 0.01≦z≦0.2, in which M represents at least one element selected from the group consisting of Al, Mg, Mn, Ti, Fe, Cu, Zn and Ga), and having an average particle diameter of 5 &mgr;m to 10 &mgr;m a C-amount of 0.14 wt % or less measured by way of the high-frequency heating-IR absorption method, and a Karl Fischer moisture content of 0.2 wt % or less when heated to 180° C. and the method comprising the steps of applying a paste of active material for positive electrode to electrode plate to make an electrode, then drying the electrode, and pressing and then installing the electrode in a battery, in a work atmosphere having an absolute moisture content of 10 g/m3 or less.

Abstract: A positive electrode material for a lithium secondary battery includes a lithium manganese oxide having a spinel structure, expressed by one of the general formulae; LixMnyO4 (where 1≦x≦1.33 and 3−x<y≦3.1−x); and LixMnyMzO4 (where M is a metallic element other than Li and Mn, 1≦x≦1.33, 3−x−z<y≦3.1−x−z, and o<z≦1.0). The metallic element M may be at least one selected from the group consisting of Mg, Al, Cr and Ni. A lithium secondary battery includes at least a positive electrode of the positive electrode material.

Abstract: A nonaqueous electrolyte battery which comprises a positive electrode including carbon fluoride or sulfur as an active material, a negative electrode including calcium as an active material, and an electrolyte including an imide salt of calcium or a sulfonic acid salt of calcium.

Abstract: Disclosed is a positive active material for a rechargeable lithium battery. The positive active material includes a core including at least one compound represented by Formula 1 and an active metal oxide shell formed on the core. Formula 1 LiA1−x−yBxCyO2 where 0≦x≦0.3, 0≦y≦0.01, and A is an element selected from the group consisting of Co and Mn; B is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al; and C is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al.

Abstract: A lithium-nickel complex oxide material for active material for positive electrode of a lithium secondary battery is provided and expressed by the general formula Lix(Ni1-yCoy)1-zMzO2 (where, 0.98≦x≦1.10, 0.05≦y≦0.4, 0.01≦z≦0.2, M=at least one element selected from the group of Al, Zn, Ti and Mg), wherein according to Rietveld analysis, the Li site occupancy rate for the Li site in the crystal is 98% or greater, and the average particle size of the spherical secondary particles is 5 &mgr;m to 15 &mgr;m, and wherein the difference in specific surface area between before and after the washing process is 1.0 m2/g or less.

Abstract: A positive electrode active material for a lithium ion secondary battery is a lithium-containing composite oxide represented by the chemical formula: Lia(Co1-x-yMgxAly)bMzOc, where M is at least one element selected from the group consisting of Na and K, and the values a, b, c, x, y and z respectively satisfy 0≦a≦1.05, 0.005≦x≦0.15, 0.0001≦y≦0.01, 0.0002≦z≦0.008, 0.85≦b≦1.1 and 1.8≦c≦2.1.

Abstract: The present invention relates to a lithium secondary battery comprising an overdischarge-preventing agent. Particularly, the present invention provides a lithium secondary battery comprising an overdischarge-preventing agent having superior effects for an overdischarge test and showing 90% or more capacity recovery after the test, by introducing lithium nickel oxide into a cathode for a lithium secondary battery comprising a lithium transition metal oxide capable of occluding and releasing lithium ions as an overdischarge-preventing agent to supply lithium ions such that irreversible capacity of an anode can be compensated or better, thereby lowering voltage of a cathode first to prevent voltage increase of an anode during the overdischarge test.

Abstract: Primary and secondary Li-ion and lithium-metal based electrochemical cell systems. Suppression of gas generation is achieved in the cell through the addition of an additive or additives to the electrolyte system of the respective cell, or to the cell whether it be a liquid, a solid- or plastized polymer electrolyte system. The gas suppression additives are preferably based on unsaturated hydrocarbons.

Abstract: A battery pack comprising a lithium ion secondary battery and a current interrupting device for protecting the secondary battery, the secondary battery comprising positive and negative electrodes, a separator interposed between the positive and negative electrodes and a non-aqueous electrolyte, the current interrupting device comprising a recoverable device and a non-recoverable device, the recoverable and non-recoverable devices being connected in series with each other, and the non-recoverable device having an operating temperature of not less than 90° C. and less than 150° C.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery, comprising a lithium-containing composite oxide, wherein the composite oxide is represented by the general formula: LizCo1-x-yMgxMyO2, the element M included in the general formula is at least one selected from the group consisting of Al, Ti, Sr, Mn, Ni and Ca, the values x, y and z included in the general formula satisfy: (i) 0≦z≦1.03; (ii) 0.005≦x≦0.1; and (iii) 0.001≦y≦0.03, the composite oxide has a crystal structure attributed to a hexagonal system in an overcharged state having a potential over 4.25 V relative to metallic Li, and a maximum value of an oxygen generation peak in a gas chromatograph mass spectrometry measurement of the composite oxide in the overcharged state is in the range of 330 to 370° C.

Abstract: The invention provides an electrochemical cell which includes a first electrode and a second electrode which is a counter electrode to said first electrode, and an electrolyte material interposed there between. The first electrode includes an alkali metal phosphorous compound doped with an element having a valence state greater than that of the alkali metal.

Abstract: Primary and secondary Li-ion and lithium-metal based electrochemical cell The suppression of gas generation is achieved through the addition of an or additives to the electrolyte system of respective cell, or to the cell itself it be a liquid, a solid- or plastized polymer electrolyte system. The gas ion additives are primarily based on unsaturated hydrocarbons.

Abstract: A non-aqueous electrolyte rechargeable battery including: (a) a positive electrode capable of charging and discharging lithium; (b) a negative electrode capable of charging and discharging lithium; (c) a separator or a lithium ion conductive layer interposed between the positive electrode and the negative electrode; and (d) a lithium ion conductive non-aqueous electrolyte, wherein the positive electrode contains a mixture of a first positive electrode active material and a second positive electrode active material, the first positive electrode active material includes lithium oxide containing manganese, the lithium oxide further contains aluminum and/or magnesium, and the second positive electrode active material includes LixCo1−y−zMgyAlzO2 where 1≦x≦1.03, 0.005≦y≦0.1 and 0.001≦z<0.02.

Abstract: Disclosed is a positive active material for a rechargeable lithium battery. The active material includes a cobalt-based compound selected from the group consisting of the compounds represented by the formulas 1 to 4. The active material has a structure of secondary particles with a size of 10 to 30 &mgr;m and the secondary particle is gathered with primary particles with a size of 1 to 5 &mgr;m. The active material includes a metallic oxide coated on the cobalt-based compound. LiCoA2  (1) LiCoO2-xBx  (2) LiCo1-xMxA2  (3) LiCo1-xMxO2-yBy  (4) where A is selected from the group consisting of O, S, F and P, B is selected from the group consisting of S, F and P, M is a transition metal selected from Al, Mg, Cr or Mn; Sr; or lanthanide metal selected from La or Ce; 0<x<1 and 0<y<1.

Abstract: This invention relates to crosslinked polymers useful as electrolytes in rechargeable batteries, to electrolytes containing such crosslinked polymers, to methods for making such polymer electrolytes, to electrodes incorporating such crosslinked polymers, to rechargeable batteries employing such crosslinked polymers as the electrolyte and to methods for producing such batteries.

Abstract: Disclosed is a positive active material for a lithium secondary battery having high capacity and long durability properties and particularly to a powder of LiaNi1-x-yC OxMyO2, LiaNi1-x-yC OxMyO2-zFz or LiaNi1-x-yC OxMyO2-zSz (where M is a metal selected from the group consisting of Al, Mg, Sr, La, Ce, V, and Ti and wherein 0≦0.99, 0.01≦y≦0.1, 0.01≦z≦0.1, and 1.00≦a≦1.1) is surface-treated by a metal alkoxide solution whereby the durability, capacity and structural safety of said positive active material is increased.

Abstract: A lithium-containing complex oxide represented by General Formula: Li1+x+&agr;Ni(1−x−y+&dgr;)/2Mn(1−x−y−&dgr;)/2MyO2 (where 0≦x≦0.15, −0.05≦x+&agr;≦0.2, 0≦y≦0.4; −0.1≦&dgr;≦0.1 (when 0≦y≦0.2) or −0.24≦&dgr;≦0.24 (when 0.2<y≦0.4); and M is at least one element selected from the group consisting of Mg, Ti, Cr, Fe, Co, Cu, Zn, Al, Ge, Zr and Sn) is provided. The lithium-containing complex oxide contains secondary particles formed of flocculated primary particles. The primary particles have a mean particle diameter of 0.3 to 3 &mgr;m, and the secondary particles have a mean particle diameter of 5 to 20 &mgr;m. By using this lithium-containing complex oxide as a positive active material, a non-aqueous secondary battery having a high capacity, excellent cycle durability and excellent storage characteristics at a high temperature is achieved.

Abstract: A positive electrode material for a lithium secondary battery which is high in safety, high in capacity, excellent in rate performance and high temperature storage performance and high in charge/discharge efficiency is provided. The positive electrode material for a lithium secondary battery is obtained by adding Al to a Li—Ni—Co—Ba—O system raw material or preferably by adding Al and an amorphous phase of an oxide thereto.

Abstract: In a non-aqueous electrolyte secondary battery provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte solution, a positive electrode active material is a mixture of lithium-manganese composite oxide and at least one of lithium-nickel composite oxide represented by a general formula LiNiaM11−aO2 and lithium-cobalt composite oxide represented by the general formula LiCobM21−bO2, and said non-aqueous electrolyte solution contains at least a saturated cyclic carbonic acid ester and an unsaturated cyclic carbonic acid ester having double bond of carbon where content by amount of said unsaturated cyclic carbonic acid ester having double bond of carbon is in a range of 1.0×10−8 to 2.4×10−4 g per positive electrode capacity 1 mAh.

Abstract: A positive electrode material for a lithium secondary battery, which is high in safety, high in capacity, excellent in cycle performance, and high in charge/discharge efficiency, is provided. The positive electrode material for a lithium secondary battery is a powder containing a Li—Ni—Co—O or Li—Ni—Co—Ba—O system component as a main component and having an amorphous phase of an oxide mixed in each of particles or formed at the surface of the particle.