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US 2023/0265291 A1Published application
Coating liquid, composite particle manufacturing method, and composite particle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasaru KUBOTA
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Abstract
The coating liquid includes a solute and a solvent. The solute comprises a phosphoric acid compound. “I0/(I0+I1+I2)” is 0.7 or less. In the 31P-NMR spectrum, I0 indicates the area of the signal from the PO4, Q0 unit, I1 indicates the area of the signal from the PO4, Q1 unit, and I2 indicates the area of the signal from the PO4, Q2 unit.
Claims10
A coating liquid comprising:
- a solute;
- and
- a solvent,
- wherein the solute includes a phosphoric acid compound,
- wherein a relationship of the following formula (1) is satisfied:
- {I0/(I0+I1+I2)}≤0.7 (1),
- wherein in the above formula (1),
- I0 indicates an area of a signal from a Q0 unit of PO4 in a 31P-NMR spectrum,
- I1 indicates an area of a signal from a Q1 unit of PO4 in the 31P-NMR spectrum, and
- I2 indicates an area of a signal from a Q2 unit of PO4 in the 31P-NMR spectrum.
7 more elements
A composite particle comprising:
- a positive electrode active material particle;
- and
- a coating film,
- wherein the coating film covers at least a part of a surface of the positive electrode active material particle,
- wherein the coating film includes phosphorus,
- wherein the coating film has a thickness of 28.5 nm or less, and
- wherein a coverage ratio measured by X-ray photoelectron spectroscopy is 83% or more.
4 more elements
Dependencies are inferred from the claim text.