Positive electrode layer, method for manufacturing positive electrode layer, and all solid-state battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHeidy Hodex Visbal Mendoza
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Abstract
In the present disclosure, a positive electrode layer used in an all-solid-state battery includes a positive electrode active material, a sulfide solid electrolyte, and a coated sulfide solid electrolyte having a coating layer covering a surface of the sulfide solid electrolyte and containing a metal sulfate, and in an S2p spectrum obtained by X-ray photoelectron spectroscopy (XPS) on the coated sulfide solid electrolyte, a ratio (P2/P1) of an intensity P2 of a peak appearing near 163 eV to an intensity P1 of a peak appearing near 167 eV is 0.15 or more and less than 0.36, thereby solving the above problem.
Claims9
A positive electrode layer for an all-solid-state battery, the positive electrode layer comprising:
- a positive electrode active material;
- and
- a coated sulfide solid electrolyte that includes (i) a sulfide solid electrolyte and (ii) a coating layer that coats a surface of the sulfide solid electrolyte and contains a metal sulfate, wherein:
- in the positive electrode layer, a ratio of an intensity P2 of a peak appearing near 167 eV to an intensity P1 of a peak appearing near 163 eV (P2/P1) is 0.15 or more and less than 0.36 in an S2p spectrum obtained by X-ray photoelectron spectroscopy (XPS) with respect to the coated sulfide solid electrolyte;
- the sulfide solid electrolyte contains Li, P, and S;
- the peak appearing near 163 eV is derived from a P—S bond;
- the peak appearing near 167 eV is derived from an S—O bond;
- and
- the coating layer has a thickness of 1 nm or more and 15 nm or less.
A method for manufacturing a positive electrode layer for an all-solid-state battery, the method comprising:
- a step of producing a coating layer containing a metal sulfate on a surface of a sulfide solid electrolyte by applying a heat treatment to the sulfide solid electrolyte at a temperature of 100° C. or more and less than 190° C. for five minutes or more and an hour or less in a dry gas to obtain a coated sulfide solid electrolyte;
- and
- a step of producing the positive electrode layer by coating a slurry containing the coated sulfide solid electrolyte and a positive electrode active material and drying the slurry, wherein
- the sulfide solid electrolyte contains Li, P, and S, and
- the positive electrode layer is produced so that:
- in the positive electrode layer, a ratio of an intensity P2 of a peak appearing near 167 eV to an intensity P1 of a peak appearing near 163 eV (P2/P1) is 0.15 or more and less than 0.36 in an S2p spectrum obtained by X-ray photoelectron spectroscopy (XPS) with respect to the coated sulfide solid electrolyte;
- the peak appearing near 163 eV is derived from a P—S bond;
- the peak appearing near 167 eV is derived from an S—O bond;
- and
- the coating layer has a thickness of 1 nm or more and 15 nm or less.
Dependencies are inferred from the claim text.