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US 11,961,999 B2Granted
Positive electrode, battery and method for manufacturing battery, battery pack, electronic device, electric vehicle, electric storage device, and electric power system
AssigneeMurata Manufacturing Co., Ltd.
InventorYosuke Koike
Life of this patent
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Abstract
A battery includes a positive electrode, a negative electrode, and an electrolyte, and the positive electrode includes a substituted barium titanate.
Claims15
A battery, comprising:
- a positive electrode, a negative electrode, and an electrolyte,
- wherein the positive electrode includes a substituted barium titanate including barium strontium calcium lead titanate;
- wherein the barium strontium calcium lead titanate is represented by a formula (1):
- (Ba1-x-y-zPbxSryCaz)TiO3 (1)
- wherein in the formula (1), x meets 0<x≤0.5, y meets 0<y≤0.2, and z meets 0<z≤0.2;
- wherein the positive electrode further includes a positive electrode active material and a conductive agent, and
- an average particle size of the substituted barium titanate is 20 nm or more and not more than an average particle size of the positive electrode active material;
- wherein the positive electrode includes a positive electrode active material layer;
- wherein the substituted barium titanate is provided in an entire of the positive electrode active material layer;
- wherein an impedance ratio (Z2/Z1) between an impedance Z1 of the battery at 30° C. and an impedance Z2 of the battery at 150° C. is 4 or more.
7 more elements
A method for manufacturing a battery, the method comprising:
- preparing a paint by mixing a positive electrode active material, a binder, and a conductive agent, and then adding a substituted barium titanate to the mixture, and
- forming a positive electrode active material layer with use of the paint,
- wherein the barium strontium calcium lead titanate is represented by a formula (1):
- (Ba1-x-y-zPbxSryCaz)TiO3 (1)
- wherein in the formula (1), x meets 0<x≤0.5, y meets 0<y≤0.2, and z meets 0<z≤0.2,
- wherein an average particle size of the substituted barium titanate is 20 nm or more and not more than an average particle size of the positive electrode active material,
- wherein the substituted barium titanate is provided in an entire of the positive electrode active material layer, and
- wherein an impedance ratio (Z2/Z1) between an impedance Z1 of the battery at 30° C. and an impedance Z2 of the battery at 150° C. is 4 or more.
5 more elements
Dependencies are inferred from the claim text.