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US 2026/0274672 A1Published application
Positive electrode active material, battery, and manufacturing method for positive electrode active material
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsDaichi KOSAKA, Takanori Mahara
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Abstract
A positive electrode active material includes a primary particle and a coating material. The primary particle contains an olivine-type phosphate compound. The coating material coats at least part of a surface of the primary particle. The coating material contains carbon and a Group 2 element.
Claims15
A positive electrode active material comprising:
- a primary particle containing an olivine-type phosphate compound;
- and
- a coating material containing carbon and a Group 2 element, the coating material coating at least part of a surface of the primary particle.
A manufacturing method for a positive electrode active material, the manufacturing method comprising:
- (a) forming a first slurry by mixing a manganese compound, a lithium compound, a phosphate compound, and a first solvent;
- (b) forming first precursor particles by drying the first slurry;
- (c) forming second precursor particles by subjecting the first precursor particles to a first heat treatment;
- (d) forming a second slurry by mixing the second precursor particles, a carbon source, a chelate compound, and a second solvent;
- (e) forming third precursor particles by drying the second slurry;
- and
- (f) manufacturing an olivine-type phosphate compound by subjecting the third precursor particles to a second heat treatment, wherein:
- the olivine-type phosphate compound is surrounded by a coating material;
- and
- the chelate compound contains a Group 2 element.
7 more elements
Dependencies are inferred from the claim text.