Abstract: This nonaqueous electrolyte secondary battery is provided with a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode has a negative electrode core body and a negative electrode mixture layer formed on the surface of the negative electrode core body. The negative electrode mixture layer contains: a negative electrode active material which has a pore volume of 0.5 ml/g or less and in which a coating layer containing a first amorphous carbon and a second amorphous carbon is formed on the surfaces of graphite particles; and a third amorphous carbon serving as a conductive material. The nonaqueous electrolyte contains difluorophosphate and a lithium salt including an oxalate complex as an anion.

Abstract: A secondary battery according to one aspect of the present disclosure includes a negative electrode which includes a negative electrode core and a negative electrode active material layer provided on at least one surface of the negative electrode core. In this secondary battery, the negative electrode active material layer includes a negative electrode active material which contains graphite having a crystalline size of 10 nm or more and an interlayer distance d002 of 0.3356 to 0.3360 nm and a rubber-based binding material having an average primary particle diameter of 120 to 250 nm, the negative electrode active material has a pore capacity of 0.5 ml/g or less at a pore diameter of 0.2 to 1 ?m measured by a mercury porosimeter, and the rate of the average primary particle diameter of the rubber-based binding material to the pore capacity of the negative electrode active material is 1.15 to 1.70 g/m2.

Abstract: In a non-aqueous electrolyte secondary battery, a negative electrode includes covered graphite particles in each of which a surface of a graphite particle is covered with amorphous carbon, styrene-butadiene rubber, and at least one of carboxymethyl cellulose and a salt of carboxymethyl cellulose. The amorphous carbon included in each of the covered graphite particles includes an amorphous carbon layer formed of a first amorphous carbon and amorphous carbon particles formed of a second amorphous carbon. The second amorphous carbon has a higher electrical conductivity than the first amorphous carbon, the amorphous carbon particles have a BET specific surface area of 37 to 47 m2/g, the styrene-butadiene rubber has an average primary particle size of 150 to 210 nm, and at least one of the carboxymethyl cellulose and the salt of carboxymethyl cellulose has a weight average molecular weight of 3.7×105 to 4.3×105.

Abstract: A secondary battery according to one aspect of the present disclosure includes a negative electrode which includes a negative electrode core and a negative electrode active material layer provided on at least one surface of the negative electrode core. In this secondary battery, the negative electrode active material layer includes a negative electrode active material which contains graphite having a crystalline size of 10 nm or more and an interlayer distance d002 of 0.3356 to 0.3360 nm and a rubber-based binding material having an average primary particle diameter of 120 to 250 nm, the negative electrode active material has a pore capacity of 0.5 ml/g or less at a pore diameter of 0.2 to 1 ?m measured by a mercury porosimeter, and the rate of the average primary particle diameter of the rubber-based binding material to the pore capacity of the negative electrode active material is 1.15 to 1.70 g/m2.

Abstract: In a non-aqueous electrolyte secondary battery including a positive electrode: a negative electrode; and a non-aqueous electrolyte, the negative electrode contains: coated graphite particles in each of which a first amorphous carbon and a second amorphous carbon having a higher electrical conductivity than that of the first amorphous carbon are fixed to a surface of a graphite particle; and a carboxymethyl cellulose having a weight average molecular weight of 3.7×105 to 4.3×105 or its salt. The non-aqueous electrolyte contains a difluorophosphate and a lithium salt which converts an oxalato complex to an anion.

Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode; a negative electrode having a negative electrode active material mixture layer containing a negative electrode active material; a separator placed between the positive electrode and the negative electrode; and a nonaqueous electrolyte, where: the negative electrode active material includes coated graphite particles in which a surface of each graphite particle is covered with a coating layer containing first amorphous carbon and second amorphous carbon; and the negative electrode active material mixture layer contains the coated graphite particles and third amorphous carbon. The negative electrode active material mixture layer has an arithmetic-average surface roughness Ra of 2.8 ?m to 3.4 ?m, the separator has an elastic modulus of 15.1 MPa to 36.3 MPa, and the nonaqueous electrolyte contains a difluorophosphate salt and a lithium salt of an oxalate complex anion.

Abstract: There is provided a nonaqueous electrolyte secondary battery in which lithium deposition on the surface of a negative electrode is suppressed. The nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode having a negative electrode active material mixture layer containing a negative electrode active material, and a nonaqueous electrolyte. The negative electrode active material contains coated graphite particles having surfaces coated with a coating layer which contains first amorphous carbon and second amorphous carbon. The negative electrode active material mixture layer contains the coated graphite particles and third amorphous carbon as a conductive agent. The nonaqueous electrolyte contains a difluorophosphate salt and a lithium salt having an oxalate complex as an anion.

Abstract: Disclosed is a non-aqueous electrolyte secondary cell excellent in capacity retention rate and I-V characteristics after repeated cycles. The secondary cell contains a negative electrode active material containing scaly graphite particles and coated graphite particles. The coated graphite particles contain graphite particles and a coating layer coating the surfaces of the graphite particles. The coating layer contains amorphous carbon particles and an amorphous carbon layer. It is preferable that the negative electrode active material contain 1 to 6% by mass of the scaly graphite particles and that the graphite particles, the amorphous carbon particles, and the amorphous carbon layer be in a mass ratio of 100:?:? where 1???10, 1???10, and ??1.34?.

Abstract: Disclosed is a non-aqueous electrolyte secondary cell excellent in capacity retention rate and I-V characteristics after repeated cycles. The secondary cell contains a negative electrode active material containing scaly graphite particles and coated graphite particles. The coated graphite particles contain graphite particles and a coating layer coating the surfaces of the graphite particles. The coating layer contains amorphous carbon particles and an amorphous carbon layer. It is preferable that the negative electrode active material contain 1 to 6% by mass of the scaly graphite particles and that the graphite particles, the amorphous carbon particles, and the amorphous carbon layer be in a mass ratio of 100:?:? where 1???10, 1???10, and ??1.34?.

Abstract: To provide a high-capacity non-aqueous electrolyte secondary battery with superior output characteristics and durability. The present invention is a non-aqueous electrolyte secondary battery including a negative electrode and a non-aqueous electrolyte, the non-aqueous electrolyte secondary battery characterized in that the non-aqueous electrolyte includes lithium bis(oxalato)borate, the negative electrode has a negative electrode core and a negative electrode active material layer formed on the negative electrode core, and the negative electrode active material is graphite particles having a D90/D10 ratio of three or more, D10 being the 10% particle size and D90 being the 90% particle size in a cumulative particle size distribution of the volume standard of the graphite particles.

Abstract: To provide with high productivity a non-aqueous electrolyte secondary battery having superior battery characteristics and a high capacity. The present invention is a non-aqueous electrolyte secondary battery including a battery assembly having a negative electrode, a positive electrode and a separator, as well as a non-aqueous electrolyte. In this non-aqueous electrolyte secondary battery, the non-aqueous electrolyte includes lithium bis(oxalato)borate, the negative electrode has a negative electrode core and a negative electrode active material layer formed on the negative electrode core, the packing density of the negative electrode active material layer is from 1.1 g/ml to 1.38 g/ml, and the battery capacity of the non-aqueous electrolyte secondary battery is equal to or greater than 21 Ah.

Abstract: To provide with high productivity a non-aqueous electrolyte secondary battery having superior battery characteristics and a high capacity. The present invention is a non-aqueous electrolyte secondary battery including a negative electrode and a non-aqueous electrolyte. In this non-aqueous electrolyte secondary battery, the non-aqueous electrolyte includes lithium bis(oxalato)borate and/or lithium difluorophosphate, the negative electrode has a negative electrode core and a negative electrode active material layer formed on the negative electrode core, a negative electrode protecting layer including insulating inorganic particles is provided on the surface of the negative electrode active layer, the porosity of the negative electrode protecting layer is equal to or greater than the porosity of the negative electrode active material layer, and the battery capacity of the non-aqueous electrolyte secondary battery is equal to or greater than 21 Ah.