Abstract: A non-aqueous electrolyte secondary battery includes at least an electrode composite material layer, an intermediate layer, and an electrode current collector. Intermediate layer is interposed between electrode composite material layer and electrode current collector. Intermediate layer contains at least insulating particles and conductive particles. Each insulating particle has an arc shape in a cross section of intermediate layer along a thickness direction. More conductive particles are present on an outer-circumference side of each arc shape than on an inner-circumference side of the arc shape.

Abstract: A lithium ion secondary battery includes at least a positive electrode, a negative electrode, and an electrolyte. The positive electrode contains at least a first positive electrode active material and a second positive electrode active material. The first positive electrode active material is expressed with a formula (I) LiNiaCobMncO2 and the second positive electrode active material is expressed with a formula (II) LiNidCoeMnfO2, where a, b, c, d, e, and f satisfy conditions of a>d, 0.4?a?0.6, 0.2?b?0.5, 0.1?c?0.2, a+b+c=1.0, 0.2?d?0.5, 0.1?e?0.2, 0.4?f?0.6, and d+e+f=1.

Abstract: A nonaqueous electrolyte secondary battery includes: a wound electrode body that is formed by laminating an elongated sheet-shaped positive electrode current collector foil, an elongated sheet-shaped negative electrode current collector foil, and an elongated sheet-shaped separator to obtain a laminate and winding the obtained laminate; a nonaqueous electrolytic solution; and a case that accommodates the wound electrode body and the nonaqueous electrolytic solution. A solid electrolyte interface film derived from an oxalato borate complex is formed on at least a surface of the negative electrode active material layer.

Abstract: Provided is a method for producing a positive electrode for a nonaqueous electrolyte secondary battery having superior electrical conductivity with high productivity. The production method disclosed herein includes the following steps: a first kneading step (S10) for kneading electrically conductive carbon fine particles and a hydrophobic binder that gels when contacted by water, in N-methyl-2-pyrrolidone (NMP); a second kneading step (S20) for adding a positive electrode active material and water to a first kneaded product obtained in the first kneading step followed by additional kneading; and a step (S30) for forming a positive electrode active material layer on the surface of a positive electrode current collector by coating a second kneaded product obtained in the second kneading step on the positive electrode current collector. The first kneaded product contains moisture, and the ratio of the mass of the moisture to the mass of the NMP is 0.

Abstract: Provided is a nonaqueous electrolyte secondary cell in which heat generation is suppressed. The nonaqueous electrolyte secondary cell according to the invention has a positive electrode including positive electrode active material particles and a negative electrode including negative electrode active material particles. The negative electrode active material particles are carbon-black-adhered carbon-based negative electrode active material particles which are constituted by a carbon material having a graphite structure in at least part thereof and which have carbon black (CB) particles that have adhered to at least part of a surface portion. The positive electrode active material particles are of a hollow structure having a shell and a hollow portion.

Abstract: A nonaqueous electrolyte secondary battery includes: a wound electrode body that is formed by laminating an elongated sheet-shaped positive electrode current collector foil, an elongated sheet-shaped negative electrode current collector foil, and an elongated sheet-shaped separator to obtain a laminate and winding the obtained laminate; a nonaqueous electrolytic solution; and a case that accommodates the wound electrode body and the nonaqueous electrolytic solution. A solid electrolyte interface film derived from an oxalato borate complex is formed on at least a surface of the negative electrode active material layer.

Abstract: Provided is a nonaqueous electrolyte secondary cell in which heat generation is suppressed. The nonaqueous electrolyte secondary cell according to the invention has a positive electrode including positive electrode active material particles and a negative electrode including negative electrode active material particles. The negative electrode active material particles are carbon-black-adhered carbon-based negative electrode active material particles which are constituted by a carbon material having a graphite structure in at least part thereof and which have carbon black (CB) particles that have adhered to at least part of a surface portion. The positive electrode active material particles are of a hollow structure having a shell and a hollow portion.

Abstract: Provided is a nonaqueous electrolyte secondary battery having both superior output characteristics and durability. The positive electrode and the negative electrode of this battery are respectively provided with a film containing lithium ions and fluoride ions. The film of the positive electrode is such that a ratio (C1/C2) of a first peak intensity C1 of 58 to 62 eV to a second peak intensity C2 of 68 to 72 eV, based on X-ray absorption fine structure (XAFS) analysis of the Li—K absorption edge, is 2.0 or more, and the fluoride ions are contained at 1.99 ?g/mg to 3.13 ?g/mg per unit mass of the positive electrode active material layer. In addition, the film of the negative electrode is such that a ratio (A1/A2) of a first peak intensity A1 of 58 to 62 eV to a second peak intensity A2 of 68 to 72 eV, based on X-ray absorption fine structure (XAFS) analysis of the Li—K absorption edge, is 2.0 or less.

Abstract: Provided is a method for producing a positive electrode for a nonaqueous electrolyte secondary battery having superior electrical conductivity with high productivity. The production method disclosed herein includes the following steps: a first kneading step (S10) for kneading electrically conductive carbon fine particles and a hydrophobic binder that gels when contacted by water, in N-methyl-2-pyrrolidone (NMP); a second kneading step (S20) for adding a positive electrode active material and water to a first kneaded product obtained in the first kneading step followed by additional kneading; and a step (S30) for forming a positive electrode active material layer on the surface of a positive electrode current collector by coating a second kneaded product obtained in the second kneading step on the positive electrode current collector. The first kneaded product contains moisture, and the ratio of the mass of the moisture to the mass of the NMP is 0.