Non-aqueous electrolyte secondary battery
View Patent ↗A non-aqueous electrolyte secondary battery has a positive electrode having a positive electrode collector, on which a positive electrode active material layer containing a positive electrode active material as a complex oxide of Li and transition metals are formed, and a negative electrode having a negative collector, on which a negative electrode active material layer is formed. The non-aqueous electrolyte secondary battery is a gel or solid non-aqueous electrolyte secondary battery having a battery device in which a positive electrode and a negative electrode are laminated with an electrolyte layer therebetween in a film-state packaging member constructed by metal foil laminated films, and containing a lithium salt, a non-aqueous solvent, and a polymer material. The concentration in mass ratio of a free acid in the electrolyte layer is 60 ppm and less. Average particle diameter of the positive electrode active material lies in a range from 10 to 22 μm, the minimum particle diameter is 5 μm or larger, the maximum particle diameter is 50 μm or smaller, and specific surface of the positive electrode active material is 0.25 m 2 /g or smaller. Lithium carbonate (Li 2 CO 3 ) contained in the positive electrode active material is 0.15 percent by weight and less. Moisture contained in the positive electrode active material is 300 ppm and less.
1. A non-aqueous electrolyte secondary battery comprising:
(a) a positive electrode comprising a positive electrode active material layer, said positive electrode active material layer comprising a positive electrode material;
(b) a negative electrode comprising a negative electrode active material and
(c) a film-state case as a packaging member,
(d) an electrolyte,
wherein,
(i) said positive electrode active material comprises at most 0.15% by weight of one or more carbonate compounds;
(ii) the amount of water contained in said positive electrode active material is at most equal to 300 ppm
(iii) said electrolyte comprises a lithium salt, a solvent, and one or more polymers selected from the group consisting of ether-based polymers, poly(methacrylate) ester polymers, acrylate polymers, and fluorine-containing polymers.
2. A non-aqueous electrolyte secondary battery according to claim 1 , wherein the positive electrode active material is a composite oxide LiMO 2 wherein M is one or more transition metals, wherein at least one of said transition metals is selected from the group consisting of Co, Ni, and Mn.
3. A non-aqueous electrolyte secondary battery according to claim 2 , wherein said composite oxide is selected from the group consisting of:
(a) LiCoO 2 ;
(b) LixCo 1-y Al y O 2 wherein 0.05≦x≦1.10 and 0.01≦y≦0.10;
(c) LiNiO 2 ;
(d) LiNi y Co 1-y O 2 wherein 0<y<1;
(e) Li x Ni y M 1-y O 2 wherein
(i) M is at least one element selected the group consisting of transition metals, B, Al, Ga, and In, and
(ii) 0.05≦x≦1.10 and 0.7≦y≦1.0,
(f) LiMn2O4; and
mixtures thereof.
4. A non-aqueous electrolyte secondary battery according to claim 1 , wherein the positive electrode active material is LiCoO 2 .
5. A non-aqueous electrolyte secondary battery according to claim 1 , wherein the packaging member is an aluminum laminate pack obtained by coating aluminum with a resin.