Abstract: A negative electrode active material composite particle according to one embodiment is a composite particle for a negative electrode active material, the composite particle including: a lithium silicate phase; silicon particles dispersed in the lithium silicate phase; and a resin-calcined material. The resin-calcined material containing at least one element selected from F and N. The composite particle has a porosity of 10% or less, for example, and the content of the resin-calcined material is 1-20% by mass with respect to the mass of the composite particle.

Abstract: A non-aqueous electrolyte secondary battery according to an aspect of the present disclosure comprises: an electrode body obtained by winding a positive electrode and a negative electrode with a separator therebetween; an electrolytic solution; and an exterior body that houses the electrode body and the electrolytic solution. The negative electrode has: a negative electrode current collector; and a negative electrode mixture layer formed on the surface of the negative electrode current collector, wherein the negative electrode mixture layer contains a negative electrode active material and fibrous carbon, and the average fiber length of the fibrous carbon contained in the central part of the negative electrode mixture layer in the width direction is greater than the average fiber length of the fibrous carbon contained in both end parts of the negative electrode mixture layer in the width direction.

Abstract: The purpose of the present disclosure is to provide a nonaqueous electrolyte secondary battery that has excellent cycle characteristics. A nonaqueous electrolyte secondary battery according to one embodiment of the present disclosure is provided with: an electrode body that comprises a positive electrode, a negative electrode and a separator; and a nonaqueous electrolyte. A mixture layer of the negative electrode contains a negative electrode active material, at least either one of carboxymethyl cellulose or a salt thereof, and at least either one of sorbic acid or a salt thereof; and the content of the sorbic acid and/or a salt thereof is 1,500 ppm or less relative to the mass of the mixture layer.

Abstract: The purpose of the present disclosure is to improve the cycle characteristics of a secondary battery that uses an Si-based active material containing Si. A negative electrode active material (Si-based active material) for secondary batteries according to one embodiment of the present invention comprises core particles, each of which is obtained by dispersing Si particles in a silicon oxide phase or a silicate phase, and a carbon material that adheres to the surfaces of the core particles. If a D/G ratio is the ratio of the peak intensity of the D-band to the peak intensity of the G-band in the Raman spectrum, the carbon material contains a first carbon material that has a D/G ratio of from 0.8 to 2 and a second carbon material that has a D/G ratio of from 0.01 to 0.5. The D/G ratio of the carbon material is from 0.2 to 0.9.

Abstract: The purpose of the present disclosure is to provide a slurry for a non-aqueous electrolyte secondary cell capable of obtaining an electrode mixture layer showing excellent adhesion with a current collector. The slurry for a non-aqueous electrolyte secondary cell, which is one mode of the present disclosure, contains: an electrode mixture containing an electrode active material, lithium carbonate, and carboxymethylcellulose or a salt thereof; and water. The lithium carbonate content is in the range of 33 to 300 ppm with respect to the total mass of the electrode mixture.

Abstract: The purpose of the present invention is to provide a nonaqueous electrolyte secondary battery which has excellent charge/discharge cycle characteristics. A nonaqueous electrolyte secondary battery negative electrode which is an example of an embodiment of the present invention comprises, as negative electrode active materials, a carbon active material and a Si active material comprising Si particles dispersed in an oxide phase containing at least silicon (Si). The Si active material includes a first Si active material and a second Si active material. The first Si active material has a median size on a volume basis that is greater than that of the second Si active material and has an Si particle content that is higher than that of the second Si active material.

Abstract: A negative electrode active material according to one embodiment of the present disclosure comprises: a composite oxide phase that contains Li, Si, Al and B; and Si particles that are dispersed in the composite oxide phase. Relative to the total number of moles of elements (excluding O) contained in the composite, oxide phase, the content of Li is from 5% by mole to 20% by mole (inclusive), the content of Si is from 50% by mole to 70% by mole (inclusive), the content of Al is from 12% by mole to 25% by mole (inclusive), and the content of B is from 12% by mole to 25% by mole (inclusive).

Abstract: A negative electrode for nonaqueous electrolyte secondary batteries is provided which includes SiOx and allows the cycle characteristics of batteries to be enhanced. A negative electrode according to an example embodiment includes a negative electrode current collector and a negative electrode mixture layer disposed on the current collector. The negative electrode mixture layer includes SiOx (0.5?x?1.5) particles having a carbon coating on a particle surface, carbonaceous active material particles, and a compound having at least one of a carboxyl group and a hydroxyl group and having an average number of etherifying agent moieties present per unit molecule of not more than 0.8. The carbon coating includes a first coating disposed on the surface of the SiOx and a second coating disposed on the first coating and including carbon having higher crystallinity than the carbon forming the first coating.

Abstract: A negative electrode for nonaqueous electrolyte secondary batteries is provided which includes SiOx and allows the cycle characteristics of batteries to be enhanced. A negative electrode according to an example embodiment includes a negative electrode current collector and a negative electrode mixture layer disposed on the current collector. The negative electrode mixture layer includes SiOx (0.5?x?1.5) particles having a carbon coating on a particle surface, carbonaceous active material particles, and a compound having at least one of a carboxyl group and a hydroxyl group and having an average number of etherifying agent moieties present per unit molecule of not more than 0.8. The carbon coating includes a first coating disposed on the surface of the SiOx and a second coating disposed on the first coating and including carbon having higher crystallinity than the carbon forming the first coating.

Abstract: A nonaqueous electrolyte secondary battery according to one aspect of the present invention contains a dispersant in a positive electrode mixture layer. The content of a positive electrode active material in the positive electrode mixture layer is 97% by mass or more, and the content ratio of a conductive agent to a binder in the positive electrode mixture layer is 1.00-1.67. The binder is composed of a polyvinylidene fluoride which has a carboxyl group or a carboxyl group derivative as a terminal functional group.

Abstract: A negative electrode plate for nonaqueous electrolyte secondary batteries according to an embodiment of the present invention includes a negative electrode mix layer, placed on a negative electrode core, containing a negative electrode active material capable of storing and releasing lithium ions. The negative electrode core is copper foil having a thickness of 5.9 ?m to 8.1 ?m and a surface roughness Rz of 0.8 ?m to 1.5 ?m. The negative electrode mix layer contains the negative electrode active material, a binding agent, and a carboxymethylcellulose-ammonium salt. The negative electrode active material is composed of a mixture of a graphite material and a silicon oxide represented by SiOx (0.5?x<1.6). The content of the silicon oxide in the negative electrode active material is 0.5% to 20% by mass.

Abstract: The cycle characteristics of nonaqueous electrolyte secondary batteries are improved. A negative electrode for nonaqueous electrolyte secondary batteries includes a negative electrode mixture layer on a negative electrode collector. The negative electrode mixture layer contains SiOX (0.5?X?1.5) particles and graphite particles, and the SiOX particles are covered with a cellulose-containing material. The negative electrode mixture layer contains a thickener and a binder, and the thickener contains at least one of a carboxyalkyl cellulose, a hydroxyalkyl cellulose, and an alkoxycellulose each having a degree of etherification of 0.8 or more.

Abstract: The high-temperature storage characteristics of nonaqueous electrolyte secondary batteries are improved. A negative electrode for nonaqueous electrolyte secondary batteries includes a negative electrode collector and a negative electrode mixture layer. The negative electrode mixture layer contains silicon-containing particles, graphite particles, and carboxymethyl cellulose ammonium salt, and the amount of NH3 in the negative electrode mixture layer is 350 ?g or less per g of the negative electrode mixture layer. The silicon-containing particles preferably have a conductive carbon material layer with which at least part of the surfaces thereof is covered. The silicon-containing particles preferably include SiOX (0.5?X?1.5) particles.

Abstract: A nonaqueous electrolyte secondary battery according to one aspect of the present invention contains a dispersant in a positive electrode mixture layer. The content of a positive electrode active material in the positive electrode mixture layer is 97% by mass or more, and the content ratio of a conductive agent to a binder in the positive electrode mixture layer is 1.00-1.67. The binder is composed of a polyvinylidene fluoride which has a carboxyl group or a carboxyl group derivative as a terminal functional group.

Abstract: A non-aqueous electrolyte secondary battery comprising a positive electrode plate, a negative electrode being provided with a negative electrode plate mixture layer containing a negative electrode active material, a separator; and a non-aqueous electrolyte. The negative electrode active material is a mixture of at least one of metal silicon and silicon oxide expressed by SiOx (0.5?x<1.6) , and graphite material. And the graphite material includes coated graphite material coated with amorphous carbon in the ratio of equal to or more than 20% by mass, and equal to or less than 90% by mass to all the graphite material, and the ratio of the metal silicon and the silicon oxide to all the negative electrode active material is equal to or more than 1% by mass and equal to or more than 20% by mass.

Abstract: The nonaqueous electrolyte secondary battery having high output characteristics and excellent safety when overcharging as well as excellent charge and discharge cycle characteristics according to an aspect of the invention includes a positive electrode having a positive electrode active material, a negative electrode having a negative electrode active material, a separator, and a nonaqueous electrolyte. The positive electrode active material includes lithium iron phosphate having an olivine crystal structure represented by General Formula LixFePO4 (where x is 0<x<1.3), the negative electrode active material includes a carbon material having an average operating potential of 0.3 V or less based on lithium in a range of 10 to 30% depth of discharge at the time of discharging at 6 mA/cm2, and the nonaqueous electrolyte includes an alkoxybenzene derivative within a range of 0.1 to 5.0% by mass.

Abstract: Provided is a method for producing an active material for a lithium secondary battery to enable efficient removal of iron impurities, which would become a problem in production of an active material for a lithium secondary battery, and attain a high quality. The method includes removing iron impurities in an active material for a lithium secondary battery by means of magnetic force. With this method, use of a magnetic force-generating device within a recess portion, which composes at least one part of the recess portion, enables efficient removal of only iron impurities. Thus, it is expected that a voltage drop caused by dissolution of iron compounds, i.e. impurities in a positive electrode, and their migration to a negative electrode in a battery, and decreases in charge and discharge efficiencies and a voltage drop owing to precipitation of lithium can be suppressed.

Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present invention includes, as generating elements, a positive electrode 11 which comprises, as a positive electrode, lithium nickel-cobalt-manganese oxide (LiNixCoyMnzO2) which can intercalate and deintercalate lithium ions or the mixture of lithium nickel-cobalt-manganese oxide (LiNixCoyMnzO2) and lithium manganese oxide whose amount is 0 to 50% by mass relative to the whole amount of the positive electrode active material, a negative electrode 12 which comprises a negative electrode active material which can intercalate and deintercalate lithium ions, and a nonaqueous electrolyte are provided. To the positive electrode 11, 5 to 20% by mass of lithium cobalt oxide relative to the whole amount of the positive electrode active material is added.