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 nonaqueous electrolyte battery that includes a unit cell and a battery case that encloses the unit cell. The battery case includes a laminate film that encloses the unit cells by heat welding at least a portion of the laminate film. Upon heat welding, the unit cell further includes a number of electrode terminal leads in which a portion of the electrical terminal leads extend from the battery case. A sealant layer is further applied to at least a portion of the electrode terminal leads so as to contact the battery case upon heat welding in order to further seal the case and to further prevent short circuiting of the nonaqueous-electrolyte battery.

Abstract: In an electric double-layer capacitor, a solution of a quaternary ammonium borofluoride compound in propylene carbonate is used as an electrolyte. The electrode includes alkali-activated carbon made using meso-phase pitch as a starting material, and a conductive filler having a rest potential smaller than that of the alkali-activated carbon in the electrolyte. The amount Fc of conductive filler incorporated in the electrode is set in a range of 10% by weight≦Fc≦40% by weight. Such electric double-layer capacitor has a large electrostatic capacity and excellent durability.

Abstract: Disclosed is a nonaqueous electrolyte comprising a nonaqueous solvent which contains ethylene carbonate (EC), propylene carbonate (PC), &ggr;-butyrolactone (BL), and a fourth component, which is a solvent other than the EC, PC and BL, and the mixing ratio x (% by volume) of EC based on the total amount of the nonaqueous solvent falls within a range of between 15 and 50, the mixing ratio y (% by volume) of PC based on the total amount of the nonaqueous solvent falls within a range of between 2 and 35, the mixing ratio z (% by volume) of BL based on the total amount of the nonaqueous solvent falls within a range of between 30 and 85, and the mixing ratio p (% by volume) of the fourth component based on the total amount of the nonaqueous solvent is larger than 0 and is not larger than 5.

Abstract: An electrolyte for a battery comprises LiBOB salt in gamma butyrolactone and a low viscosity solvent. The low viscosity solvent may comprise a nitrile, an ether, a linear carbonate, or a linear ester. This electrolyte is suitable for use in lithium ion batteries having graphite negative electrodes. Batteries using this electrolyte have high conductivity, low polarization, and high discharge capacity.

Abstract: Carbon fiber having cross sectional shape which satisfies area replenishment rate of 0.8 or more is used as anode material for non-aqueous electrolyte secondary battery. Alternatively, since value of fractal dimension of cross section high order structure of the random radial type carbon fiber can be utilized as material parameter for evaluating the cross sectional structure, carbon fiber in which the value of the fractal dimension is caused to fall within the range from 1.1 to 1.8 and the crystallinity has been controlled such that it falls within reasonable range is used as anode material for non-aqueous electrolyte secondary battery. Further, carbon fiber having cross section high order structure such that the central portion is radial type structure and the surface layer portion is random radial type structure is used as anode material for non-aqueous electrolyte secondary battery. Furthermore, it is also effective to use carbon fiber having notch structure at the cross section.

Abstract: A negative electrode for a rechargeable battery including: a current collector, a first layer containing a conductive material to occlude and release lithium ion, the first layer formed on the current collector, a second layer containing a metal selected from lithium and lithium alloy, the second layer formed on the first layer, and a third layer containing a lithium ion conductive material, the third layer formed on the second layer. The third layer prevents the lithium and/or the lithium alloy in the second layer from being in contact with the electrolyte and smoothly feeds the lithium to the second layer to improve the efficiency of the negative electrode. The first layer can occlude and release the part of the lithium to be occluded and released, thereby reducing the volume change of the second layer. Such a structure of the negative electrode enables us to enhance cycling efficiency, and to attain long cycle life and good safety.

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: The present invention discloses a composite material for anode of lithium secondary battery, comprising: a porous particle nucleus formed by bonding of at least silicon-containing particles and carbon-containing particles, and a carbon-made covering layer formed thereon; and a process for producing such a composite material. The composite material has an average particle diameter of preferably 0.1 to 50 &mgr;m and a specific surface area of preferably 5 m2/g or less. In the composite material, the silicon content in the porous particle nucleus is 10 to 90% by mass.

Abstract: The present invention is a secondary battery having a high specific capacity and good cycleability, and that can be used safely. The secondary battery is manufactured to include an anode formed from a host material capable of absorbing and desorbing lithium in an electrochemical system such as a carbonaceous material, and lithium metal dispersed in the host material. The freshly prepared anodes of the invention are combined with a positive electrode including an active material, a separator that a separates the positive electrode and the negative electrode, and an electrolyte in communication with the positive electrode and the negative electrode. The present invention also includes a method of preparing a freshly prepared anode and a method of operating a secondary battery including the anode of the invention.

Abstract: A non-aqueous electrolytic solution capable of depressing deterioration of battery properties in a high temperature environment is provided. A secondary battery is also provided. The non-aqueous electrolytic solution containing at least an organic solvent and a lithium salt further contains a particular pyridine compound.

Abstract: A negative electrode for a lithium rechargeable battery includes a carbon material in which lithium intercalation occurs, and at least one metallic oxide selected from yttrium oxide, cerium oxide, and titanium oxide.

Abstract: A rechargeable lithium battery using an Li alloying metal as the active material of at least one of its positive and negative electrodes. The metal active material is covered with a thin film which is nonreactive with Li ions, permits passage of Li ions but does not have an Li ion conductivity.

Abstract: A lithium secondary battery-use active matter containing a material capable of electrochemically desorbing and inserting Li, and having a metallic iron grade in the material of less than 5 ppm; and a lithium secondary battery having this active matter. An iron grade in the material of less than 5 ppm can keep a capacity maintaining factor within a high-value range after specified cycles to improve the performance of a lithium secondary battery.

Abstract: A lithium ion battery includes an anode, a cathode, and an electrolyte between the two. When the battery is in its initial charged state, as it is upon exiting the manufacturing process, the anode is composed of a first portion of lithium-deficient electrode material, and a second portion of lithium-rich or lithium-intercalated material coated on at least a part of the surface of the first portion. And the cathode is composed of lithium-deficient material adapted to react reversibly with lithium ions from the lithium-rich second portion of the anode during subsequent discharge of the battery from its initial charged state as the second portion becomes fully consumed.

Abstract: A method for manufacturing a lithium secondary cell comprising a positive electrode containing a lithium titanate as an active material, a negative electrode containing a carbonaceous material as an active material, and an electrolytic solution comprising a solution of a lithium salt in an organic solvent. The lithium titanate preferably has a composition of the formula: LixTiyO4 (0.8≦x≦1.4 and 1.6≦y≦2.2). The lithium secondary cell has a high capacity suitable for use as a power source for a wristwatch and good charge-discharge properties, at a nominal voltage of 1.5 V.

Abstract: A lithium ion electrochemical cell having high charge/discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one carbonate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture including ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate. The preferred additive is either a linear or cyclic carbonate containing covalent O—X and O—Y bonds on opposite sides of a carbonyl group wherein at least one of the O—X and the O—Y bonds has a dissociation energy less than about 80 kcal/mole.

Abstract: Disclosure is a non-aqueous electrolyte solution secondary battery having an improved negative electrode material. The negative electrode material contains a carbonaceous material that has a Lc value of 0.70 to 2.20 nm calculated from X-ray diffraction analysis, and a degree of graphitization R value (ID/IG) is 0.90 to 1.20, the degree of graphitization being obtained by the ratio of the peak height (ID) representing a vibration mode based on a non-crystalline disorder structure within the range of from 1300 to 1400 cm−1 that is measured by Raman spectrum to the peak height (IG) representing a vibration mode based on a graphite crystalline structure within the range of 1580 to 1620 cm−1.

Abstract: A lithium polymer secondary battery comprising: a negative electrode including a carbonaceous material, as an active material, obtainable by attaching or covering an amorphous carbon on the surface of graphite particle; an electrolyte layer; and a positive electrode having at least a metal oxide containing lithium as an active material, wherein the electrolyte layer comprising: a polymer containing a unit derived from vinylene carbonate; an organic solvent; and lithium salt.

Abstract: Artificial graphite particles, having a secondary particle structure in which a plurality of primary particles composed of graphite are clustered or bonded together, and having a layer structure in which the edge portion of the primary particles is bent in a polyhedral shape.

Abstract: An alkali metal secondary electrochemical cell, and preferably a lithium ion cell, activated with an equilibrated quaternary solvent system, is described. The solvent system comprises a mixture of dialkyl carbonates and cyclic carbonates, and preferably a quaternary mixture of dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate and ethylene carbonate with dimethyl carbonate, diethyl carbonate and ethylmethyl carbonate in an equilibrated molar mixture. Lithium ion cells activated with this electrolyte have good room temperature cycling characteristics and excellent low temperature discharge behavior.

Abstract: This invention relates to electrolyte solution compositions useful in lithium-ion batteries. These electrolytes feature lower volatility than solutions known in the art while retaining excellent battery performance using graphite based negative electrode active materials.

Abstract: A non-aqueous electrolyte for stabilizing the active surface of a lithium anode and a lithium battery using the non-aqueous electrolyte are provided.

Abstract: Graphite material capable of absorbing and desorbing lithium is used in the negative electrode material of a non-aqueous electrolyte secondary battery. The negative electrode material is bound by at least one type of material selected from the group consisting of ethylene-propylene-acrylic acid copolymers, ethylene-propylene-acrylate copolymers, ethylene-propylene-methyl acrylic acid copolymers, ethylene-propylene-methacrylic acid copolymers, ethylene-propylene-methacrylate copolymers, and ethylene-propylene-methyl methacrylic acid copolymers, in which the ethylene-propylene content of the binder is the range of 70-95%. A non-aqueous electrolyte secondary battery with a high anti-peeling strength of the electrode mix, superiority in the ease of handling, a high reliability in mass production, a superior low-temperature discharge characteristic and cycle characteristic is provided by using the negative electrode in combination with a rechargeable positive electrode and a non-aqueous liquid electrolyte.

Abstract: A new sandwich negative electrode design for a secondary cell is provided comprising a “sacrificial” alkali metal along with a carbonaceous anode material. In the case of a hard carbon anode material, the sacrificial alkali metal is preferably lithium and is sized to compensate for the initial irreversible capacity of this anode material. Upon activating the cells, the lithium metal automatically intercalates into the hard carbon anode material. That way, the sacrificial lithium is consumed and compensates for the generally unacceptable irreversible capacity of hard carbon. The superior cycling longevity of hard carbon now provides a secondary cell of extended use beyond that know for conventional secondary cells having only graphitic anode materials.

Abstract: Disclosed is a carbonaceous material comprising a graphite particle having a 002 plane interval d002 of less than 0.337 nm as measured by the X-ray wide angle diffraction method; a complex particle disposed and distributed in the vicinity of the surface of the graphite particle, the complex particle comprising silicon and carbon and having a particle size smaller than that of the graphite particle; and an amorphous carbon layer with a plane interval d002 of more than 0.37 nm, the amorphous carbon layer being a polymer layer and being coated on the graphite particle and the complex particle, wherein the complex particle comprises a Si particulate, a conductive carbon material disposed and distributed in the vicinity of the surface of the Si particulate, and a rigid carbon material layer coated on the Si particulate and the conductive carbon material, the Si particulate being composed of a crystalline Si phase.

Abstract: The present invention provides anode material consisting of anode active material having a great charge-discharge capacity, a high charge-discharge efficiency, a flat discharge curve and good charge-discharge cycle properties, and provides the anode material for a lithium secondary battery consisting of being coated with an amorphous metal compound formed by a metal capable of alloying with lithium on at least one part of the surface of a carbon material capable of absorbing and releasing lithium ion.

Abstract: The high rate discharge performance and cyclability are improved. A battery having a hich capacity density and excellent cyclability and safety performance can be produced. A composite active material provided with a polymer on the surface of a carbon-based active material in an amount of from 0.01% to 5% by weight is used. Further, a composite active material provided with a polymer on the surface of a carbon-based active material in an amount of from 0.04 to 4% by weight is used. In particular, the former composite active material is used as a positive active material while the latter composite active material is used as a negative active material to obtain a non-aqueous electrolyte battery.

Abstract: In a non-aqueous electrolyte secondary battery, a cyclic carboxylic acid ester having a high conductivity in a low-temperature environment is used as an electrolyte, and, furthermore, a cyclic carbonic acid ester having at least one carbon-carbon unsaturated bond is added thereto for the inhibition of reductive decomposition of the cyclic carboxylic acid ester.

Abstract: A non-aqueous-electrolyte based secondary battery includes a mixture of lithium manganate and lithium nickelate as a cathode active material, and includes at least one element selected from Bi, Pb, Sb and Sn.

Abstract: Carbon fiber having cross sectional shape which satisfies area replenishment rate of 0.8 or more is used as anode material for non-aqueous electrolyte secondary battery. Alternatively, since value of fractal dimension of cross section high order structure of the random radial type carbon fiber can be utilized as material parameter for evaluating the cross sectional structure, carbon fiber in which the value of the fractal dimension is caused to fall within the range from 1.1 to 1.8 and the crystallinity has been controlled such that it falls within reasonable range is used as anode material for non-aqueous electrolyte secondary battery. Further, carbon fiber having cross section high order structure such that the central portion is radial type structure and the surface layer portion is random radial type structure is used as anode material for non-aqueous electrolyte secondary battery. Furthermore, it is also effective to use carbon fiber having notch structure at the cross section.

Abstract: A battery that can achieve both of a large capacity and excellent charge/discharge cycle characteristics is provided. A negative electrode in a disk shape housed in an outer cup is stacked on a positive electrode in a disk shape housed in an outer can through a separator. The negative electrode is formed to include a porous body composed of a pure substance, an alloy, or a compound of a metallic element or a semimetallic element that can be alloyed with lithium, and having holes in a continuous solid body. Since the porous body is unlikely to break down in absorbing and desorbing lithium, excellent charge/discharge cycle characteristics can be provided.

Abstract: The invention relates to the use of cyano-substituted thiophenes as electrolyte additives for protecting nonaqueous, rechargeable lithium batteries from overcharging, and lithium batteries comprising these additives.

Abstract: The gist of the instant invention is the use of lithium carbide in the cathode of a rechargeable lithium ion battery. Lithium carbide is used to electrochemically release electrons and lithium ions from the cathode. A preferred cathode of the instant invention is graphite intercalated with a mixture of lithium carbide and a lithium salt such as lithium tetrafluoroborate.

Abstract: The present invention is a secondary battery having a high specific capacity and good cycleability, and that can be used safely. The secondary battery is manufactured to include an anode formed from a host material capable of absorbing and desorbing lithium in an electrochemical system such as a carbonaceous material, and lithium metal dispersed in the host material. The freshly prepared anodes of the invention are combined with a positive electrode including an active material, a separator that a separates the positive electrode and the negative electrode, and an electrolyte in communication with the positive electrode and the negative electrode. The present invention also includes a method of preparing a freshly prepared anode and a method of operating a secondary battery including the anode of the invention.

Abstract: A lithium polymer secondary battery which comprises a negative electrode, a positive electrode, and polymer electrolyte layers united respectively with the two electrodes and differing in viscoelastic behavior. In this battery, conformation to the expansion and shrinkage accompanying charge/discharge is easy and the interfacial resistance between each electrode and the polymer electrolyte is kept low.

Abstract: Disclosed is a battery which is improved in cyclic characteristics at the same time as the battery capacity is increased. On an anode substrate 8, there is formed, by a thin film forming technique, a layer of the active material 10, containing a metal that may be alloyed with lithium as an anode active material. The battery includes an anode 5 containing one or more of a metal not alloyed with lithium, an alloy or a compound containing the metal, and a carbonaceous material capable of doping/undoping lithium ions, as well as the metal that may be alloyed with lithium, a cathode 6 and a non-aqueous liquid electrolyte 4. The metal contained in the anode 5 as an anode active material and which may be alloyed with lithium acts to raise the battery capacity, while the metal not alloyed with lithium, alloys or compounds of this metal or the carbonaceous material suppresses deterioration of the anode 5 attendant on the charging/discharging to improve cyclic characteristics.

Abstract: Disclosed is a negative active material slurry composition for a rechargeable lithium battery. The negative active material slurry composition includes a negative active material, a compound and an organic solvent. The compound includes transition metals, alkaline metals, alkaline earth metals and semi-metals. The negative active material slurry composition has long cycle life owing to the compound.

Abstract: The present invention provides a technology of inhibiting the decomposition of the solvent of the electrolyte solution for the secondary battery. Further, the present invention provides a technology of prohibiting the resistance increase of the secondary battery and improving the storage properties such as improving the capacity retention ratio. The electrolyte solution 15 comprising non-proton solvent and cyclic sulfonic ester including at least two sulfonyl groups may be used.

Abstract: A lithium secondary battery which comprises a negative electrode, a positive electrode, and disposed therebetween a polymer electrolyte comprising an ionically conductive polymer. The polymer electrolyte has a two-layer structure composed of a positive-electrode-side layer and a negative-electrode-side layer. The polymer electrolyte on the positive-electrode side contains a nonaqueous electrolytic solution containing a lithium salt in a higher concentration than that in the polymer electrolyte on the negative-electrode side. The battery is improved in charge/discharge cycling characteristics and high-load discharge characteristics.

Abstract: A lithium secondary cell with a small decrease in discharge capacity during high-load discharge and little self-discharge. The electrolytic layers of the cell consist of positive-side and negative-side polymer electrolytic layers integrated with their respective electrodes, wherein the positive-side electrolytic layer is lower than the negative-side electrolytic layer indirect current resistance.

Abstract: A non-aqueous electrolyte secondary battery having a large discharge capacity and improved charge/discharge cycle characteristics is disclosed. The battery has a negative electrode which comprises a negative electrode active material composed of an element or a compound of the element capable of reacting with lithium, and a negative electrode current collector, where the negative electrode active material contains at least carbon black.

Abstract: A lithium polymer secondary cell having a negative electrode, a positive electrode and, arranged between the electrodes, a polymer electrolyte layer, characterized in that the cell has been subjected to a heat treatment at a temperature of 40 to 60° C. after the assembly thereof. The polymer cell is freed of or is reduced in the adverse effect of a residual monomer and initiator on the performance of the cell. The polymer electrolyte is formed by cross-linking polymerization of a precursor monomer for an ion conducting polymer in a non-aqueous electrolyte, and the residual monomer and initiator contained therein is consumed by the heat treatment.

Abstract: The present invention is a secondary battery having a high specific capacity and good cycleability, and that can be used safely. The secondary battery is manufactured to include an anode formed from a host material capable of absorbing and desorbing lithium in an electrochemical system such as a carbonaceous material, and lithium metal dispersed in the host material. The anodes of the invention are combined with a cathode including an active material, a separator that a separates the cathode and the anode, and an electrolyte in communication with the cathode and the anode. The present invention also includes a method of preparing an anode and a method of operating a secondary battery including the anode of the invention.

Abstract: The invention relates to a rechargeable electrochemical cell comprising a negative electrode, an electrolyte and a positive electrode in which the positive electrode structure comprises a lithium cobalt manganese oxide of the composition Li2CoyMn2−yO4 where 0<y<0.6. The lithium cobalt manganese oxide of the above formula can be the only active compound or can be used together with one or more other rechargeable compounds. The lithium cobalt manganese oxide of the above formula may be in air and moisture insensitive tetragonal form and provides additional active lithium to compensate for capacity losses in lithium ion cells and lithium-alloy cells.

Abstract: An electrochemical cell includes an active element having an anode including carbon, a cathode including a metal oxide, a separator between the anode and the cathode, and an electrolyte disposed between the anode and the cathode. The anode, cathode, and separator are preferably in planar form rolled into a spiral. There is a sealed housing having an interior in which the active element is received, and a gas filling a gas space of the sealed housing. The gas has from about 10 to about 100 percent by volume of the conductive gas hydrogen, helium, and/or neon, or mixtures thereof.

Abstract: Disclosed is a carbon-based active material for a rechargeable lithium battery that is capable of increasing charge and discharge efficiency of the battery. The carbon-based active material has no hydroxyl groups on a surface by heat-treating under a fluorine atmosphere.

Abstract: A lithium secondary cell comprising a safe aqueous-solution electrolyte free from danger of firing and explosion and capable of supplying a high voltage of more than 3 V. The cell includes a positive plate having an active material absorbing/desorbing lithium ions and exhibiting a high voltage, a negative plate having an active material exhibiting a low voltage, a polymer solid electrolyte having a lithium-ionic conductivity, and an aqueous-solution electrolyte. The positive and negative plates are coated with a polymer solid electrolyte having an ionic conductivity and therefore isolated from the aqueous-solution electrolyte by the plate coating layers.

Abstract: A rechargeable lithium-ion cell capable of being discharged to deliver high power pulses sufficient for implantable defibrillation applications and the like, is described. The cell is housed in a casing having an external volume of 5 cm3, or less. Both the negative and positive electrodes are less than about 0.15 mm in total thickness. Negative and positive electrodes of a reduced thickness provide the cell with high electrode surface area relative to its volume. As such, the present cell is capable of providing pulses in excess of 30C with minimal voltage drop.

Abstract: The present invention provides anode material consisting of anode active material having a great charge-discharge capacity, a high charge-discharge efficiency, a flat discharge curve and good charge-discharge cycle properties, and provides the anode material for a lithium secondary battery consisting of being coated with an amorphous metal compound formed by a metal capable of alloying with lithium on at least one part of the surface of a carbon material capable of absorbing and releasing lithium ion.