Abstract: A purpose of the present invention is to provide a lithium ion secondary battery having more improved life characteristics while suppressing gelation of an electrode mixture slurry in a manufacturing process. The lithium ion secondary battery according to the present invention comprises a positive electrode having a positive electrode mixture layer comprising a layered lithium-nickel composite oxide in which a proportion of nickel in metals other than lithium is 80 mol % or more; LiOH; Li2CO3; and a chlorine-containing polyvinylidene fluoride-based polymer, wherein a content of LiOH in the positive electrode mixture layer and a content of Li2CO3 in the positive electrode mixture layer are each 0.1 weight % or more and 2.1 weight % or less, a total content of LiOH and Li2CO3 in the positive electrode mixture layer is 0.2 weight % or more and 4.2 weight % or less, and a content of chlorine in the positive electrode mixture layer is 30 ?g/g or more and 120 ?g/g or less.

Abstract: A purpose of one embodiment of the present invention is to provide a lithium ion secondary battery which comprises lithium nickel composite oxide having high nickel content in a positive electrode and has excellent battery characteristics. The first lithium ion secondary battery of the present invention comprises a lithium nickel composite oxide represented by the following formula and carbon nanotubes in a positive electrode, wherein a ratio (a)/(b) of an average length (a) of the carbon nanotubes to an average particle size (b) of primary particles of the lithium nickel composite oxide is 0.5 or more, LiyNi(1-x)MxO2 wherein 0?x?0.4, 0<y?1.2, and M is at least one element selected from the group consisting of Co, Al, Mn, Fe, Ti, and B.

Abstract: Provided is a lithium ion secondary battery that has excellent cycle characteristics and employs a silicon material for a negative electrode. This lithium ion secondary battery is characterized by having a negative electrode comprising a plate-like artificial graphite and a material comprising silicon as a constituent element, wherein at least some of particles of the plate-like artificial graphite are bent and have a crease on a plate face.

Abstract: There is provided a lithium ion secondary battery having excellent cycle characteristics at a high temperature and comprising lithium nickel composite oxides, in which the Ni content is high, in a positive electrode. The present invention relates to a lithium ion secondary battery having a positive electrode, a negative electrode and an electrolyte solution, wherein the positive electrode comprises a lithium nickel complex oxide denoted by the general formula, LiNixCoyMnzO2, wherein x, y, and z are respectively 0.75?x?0.85, 0.05?y?0.15, and 0.10?z?0.20.

Abstract: A purpose of the present invention is to provide a lithium ion secondary battery having more improved life characteristics while suppressing gelation of an electrode mixture slurry in a manufacturing process. The lithium ion secondary battery according to the present invention comprises a positive electrode having a positive electrode mixture layer comprising a layered lithium-nickel composite oxide in which a proportion of nickel in metals other than lithium is 80 mol % or more; LiOH; Li2CO3; and a chlorine-containing polyvinylidene fluoride-based polymer, wherein a content of LiOH in the positive electrode mixture layer and a content of Li2CO3 in the positive electrode mixture layer are each 0.1 weight % or more and 2.1 weight % or less, a total content of LiOH and Li2CO3 in the positive electrode mixture layer is 0.2 weight % or more and 4.2 weight % or less, and a content of chlorine in the positive electrode mixture layer is 30 ?g/g or more and 120 ?g/g or less.

Abstract: A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention provides a lithium ion secondary battery which comprises a negative electrode comprising graphite particles, silicon oxide particles having a composition represented by SiOx(0<x?2), and hardly graphitizable carbon particles.

Abstract: A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention relates to a lithium ion secondary battery having a negative electrode comprising a graphite and a silicon oxide having a composition represented by SiOx (0<x?2), wherein AG/AS is within a range of 0.6 or more and 1.6 or less when a particle number average aspect ratio of the graphite is defined as AG and a particle number average aspect ratio of the silicon oxide is defined as AS.

Abstract: A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention relates to a lithium ion secondary battery having a negative electrode comprising a graphite and a silicon oxide having a composition represented by SiOx (0<x?2), wherein AG/AS is within a range of 0.6 or more and 1.6 or less when a particle number average aspect ratio of the graphite is defined as AG and a particle number average aspect ratio of the silicon oxide is defined as AS.

Abstract: A purpose of one embodiment of the present invention is to provide a lithium ion secondary battery which comprises lithium nickel composite oxide having high nickel content in a positive electrode and has excellent battery characteristics. The first lithium ion secondary battery of the present invention comprises a lithium nickel composite oxide represented by the following formula and carbon nanotubes in a positive electrode, wherein a ratio (a)/(b) of an average length (a) of the carbon nanotubes to an average particle size (b) of primary particles of the lithium nickel composite oxide is 0.5 or more, LiyNi(1-x)MxO2 wherein 0?x?0.4, 0<y?1.2, and M is at least one element selected from the group consisting of Co, Al, Mn, Fe, Ti, and B.

Abstract: Provided is a lithium ion secondary cell using lithium manganese-based oxide as a positive electrode active material, wherein SEI films suppressing deterioration during repeated charge/discharge are easily formed not only on the negative electrode surface, but also on the positive electrode surface, deterioration in capacity upon use, in particular, under high-temperature environments is suppressed, charge/discharge cycle characteristics are improved and lifespan is lengthened. The lithium ion secondary cell includes a positive electrode active material layer containing lithium manganese-based oxide as a positive electrode active material, a negative electrode active material layer containing a negative electrode active material, and an electrolytic solution used to immerse the positive electrode active material layer and the negative electrode active material layer, wherein the positive electrode active material layer contains carbon nanotubes and the electrolytic solution contains sulfonic acid ester.

Abstract: A secondary battery which is highly safe even when it becomes in excessively high-temperature conditions and is excellent in cycle characteristics, and an electrode for a secondary battery are provided. The present invention relates to an electrode for a secondary battery comprising a maleimide compound and a conductive agent, wherein the conductive agent comprises at least one selected from carbon nanotube and carbon nanohorns.

Abstract: Provided is a lithium ion secondary battery that has excellent cycle characteristics and employs a silicon material for a negative electrode. This lithium ion secondary battery is characterized by having a negative electrode comprising a plate-like artificial graphite and a material comprising silicon as a constituent element, wherein at least some of particles of the plate-like artificial graphite are bent and have a crease on a plate face.

Abstract: The present invention relates to a negative electrode for a lithium ion secondary battery, the negative electrode containing a negative electrode active material containing a first carbon and a second carbon, in which the first carbon is spherical graphite, the second carbon is massive graphite, and the sulfur concentration in the first carbon (Sx) and the sulfur concentration in the second carbon (Sy) are each independently 0 ppm or more and 300 ppm or less.

Abstract: There is provided a lithium ion secondary battery having excellent cycle characteristics at a high temperature and comprising lithium nickel composite oxides, in which the Ni content is high, in a positive electrode. The present invention relates to a lithium ion secondary battery having a positive electrode, a negative electrode and an electrolyte solution, wherein the positive electrode comprises a lithium nickel complex oxide denoted by the general formula, LiNixCoyMnzO2, wherein x, y, and z are respectively 0.75?x?0.85, 0.05?y?0.15, and 0.10?z?0.20.

Abstract: Use of a silicon-based material in a negative electrode of a lithium ion secondary battery results in a decrease in discharge capacity and an increase in internal resistance. In order to overcome this, the lithium ion secondary battery according to the present invention is characterized in having a negative electrode comprising a carbon nanotube having a peak between 2600 and 2800 cm?1 in a Raman spectrum obtained by Raman spectroscopy, a graphite, and a silicon oxide having a composition represented by SiOx (0<x?2).

Abstract: The present invention provides a lithium ion secondary battery comprising: a positive electrode; a negative electrode comprising a negative electrode active material comprising at least one carbon material selected from the group consisting of a natural graphite, an artificial graphite, a non-graphitizable carbon and a graphitizable carbon; and an electrolyte solution comprising a specific cyclic disulfonate ester compound and an acid anhydride.

Abstract: A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention relates to a lithium ion secondary battery having a negative electrode comprising a graphite and a silicon oxide having a composition represented by SiOx (0<x?2), wherein AG/AS is within a range of 0.6 or more and 1.6 or less when a particle number average aspect ratio of the graphite is defined as AG and a particle number average aspect ratio of the silicon oxide is defined as AS.

Abstract: The purpose of the present invention is to provide a lithium-ion battery that exhibits excellent long-term life properties, does not suffer from rapid capacity degradation, and exhibits excellent charging/discharging characteristics in low-temperature environments. The present invention is directed to a lithium ion battery comprising: a negative electrode which comprises a negative electrode active material containing at least one of a graphite and an amorphous carbon, conductive additives containing a graphite, and a binder; a nonaqueous electrolyte solution; and a positive electrode containing a positive electrode active material capable of occluding and releasing lithium. The negative electrode active material has a spherical or massive shape, the conductive additives have a platy shape, and a part of an edge surface of the conductive additives contacts a surface of the negative electrode active material.

Abstract: A negative electrode for a lithium ion secondary battery is disclosed, which comprises, as active materials, (a) at least one material selected from metals capable of forming an alloy with lithium and metal oxides capable of absorbing and desorbing lithium ions (hereinafter referred to as metal and/or metal oxide), and (b) a surface-coated carbon material capable of absorbing and desorbing lithium ions; wherein, an average value of circularity of the metal and/or metal oxide particles defined by following formula (1) is 0.78 or more; Circularity=4?S/L2 ??(1) wherein S is an area of a projected image of particle and L is a circumferential length of the projected image of particle. The lithium ion secondary battery having this electrode has improved cycle characteristics.

Abstract: A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention provides a lithium ion secondary battery which comprises a negative electrode comprising graphite particles, silicon oxide particles having a composition represented by SiOx (0<x?2), and hardly graphitizable carbon particles.