US12312497B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12312497-B2 |
| Application number | US-202318103065-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 30, 2023 |
| Priority date | Mar 25, 2022 |
| Publication date | May 27, 2025 |
| Grant date | May 27, 2025 |
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The coating liquid includes a solute and a solvent. The solute comprises a phosphoric acid compound and a lithium compound. The coating liquid has a pH of 2.5 to 10.7.
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What is claimed is: 1. A coating liquid comprising: a solute; and a solvent, wherein: the solute includes a phosphoric acid compound and a lithium compound and has a pH of 2.5 to 10.7; and a molar ratio of lithium with respect to phosphorus is from 0.45 to 0.75. 2. The coating liquid according to claim 1 , wherein the lithium compound includes lithium hydroxide. 3. The coating liquid according to claim 1 , wherein the phosphoric acid compound includes at least one selected from a group consisting of metaphosphoric acid and polyphosphoric acid. 4. A manufacturing method of a composite particle, the manufacturing method comprising: (a) preparing a mixture by mixing the coating liquid according to claim 1 and a positive electrode active material particle; and (b) manufacturing the composite particle by drying the mixture. 5. The manufacturing method according to claim 4 , wherein: the positive electrode active material particle has a chemical composition represented by the following equation (1) LiNi x M 1 1-x O 2 . . . (1); and in the above equation (1), M 1 includes at least one selected from a group consisting of Co, Mn, and Al, and x satisfies a relation of 0.5≤x≤1. 6. A manufacturing method of an all solid state battery, the manufacturing method comprising: (c) manufacturing a positive electrode including a composite particle manufactured by the manufacturing method according to claim 4 , and a sulfide solid electrolyte; and (d) manufacturing the all solid state battery including the positive electrode.
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