Sulfide solid electrolyte and method for manufacturing same
AssigneeAGC Inc.
InventorsNaoki Fujii, Kosho Akatsuka, Manabu Nishizawa, Hideaki Hayashi
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Abstract
A sulfide solid electrolyte to be use in a lithium-ion secondary battery includes an argyrodite crystal structure represented by LiaPSbHac (where 5≤a≤7, 4≤b≤6, and 0<c≤2, and Ha represents a halogen element), in which in an X-ray diffraction spectrum using a Cu-Kα ray, the argyrodite crystal structure has a peak A and a peak B, each having a full width at half maximum of 0.07° or more, within a range of 2θ=30.3°±0.5°, and a difference between diffraction angles (2θ) of the peak A and the peak B is 0.05° or more.
Claims6
A sulfide solid electrolyte to be used in a lithium-ion secondary battery, the sulfide solid electrolyte comprising
- an argyrodite crystal structure represented by LiaPSbHac (where 5≤a≤7, 4≤b≤6, and 0<c≤2, and Ha represents a halogen element), wherein
- in an X-ray diffraction spectrum using a Cu-Kα ray, the argyrodite crystal structure has a peak A and a peak B, each having a full width at half maximum of 0.07° or more, within a range of 2θ=30.3°±0.5°, and a difference between diffraction angles (2θ) of the peak A and the peak B is 0.05° or more;
- and
- in an X-ray diffraction spectrum using a Cu-Kα ray after a heat treatment is performed at a temperature of 400° C. or higher and a thermal decomposition temperature or lower for 1 hour, at least one phenomenon selected from the group consisting of the following (i), (ii) and (iii) is observed:
- (i) a decrease in a peak intensity ratio of the peak A,
- (ii) an increase in a peak intensity ratio of the peak B, and
- (iii) an appearance of a peak C existing on a higher angle side than the peak A and on a lower angle side than the peak B, or an increase in a peak intensity ratio of the peak C.
A sulfide solid electrolyte to be used in a lithium-ion secondary battery, the sulfide solid electrolyte comprising
- an argyrodite crystal structure represented by LiaPSbHac (where 5≤a≤7, 4≤b≤6, and 0<c≤2, and Ha represents a halogen element), wherein
- in an X-ray diffraction spectrum using a Cu-Kα ray, the argyrodite crystal structure has a peak D and a peak E, each having a full width at half maximum of 0.07° or more, within a range of 2θ=30.3°±0.5°,
- a difference between diffraction angles (2θ) of the peak D and the peak E is 0.02° to 0.4°, and
- the X-ray diffraction spectrum is not changed even if a heat treatment is performed at a temperature of 400° C. or higher and a thermal decomposition temperature or lower for 1 hour.
A method for manufacturing a sulfide solid electrolyte to be used in a lithium-ion secondary battery, the method comprising:
- mixing raw materials comprising Li, P, S and Ha, and heating and melting the raw materials;
- and
- then performing crystallization by rapid cooling under a normal pressure, wherein
- the Ha represents a halogen element, and
- the sulfide solid electrolyte comprises two or more different argyrodite crystal structures each represented by LiaPSbHac (where 5≤a≤7, 4≤b≤6, and 0<c≤2, and Ha represents a halogen element).
Dependencies are inferred from the claim text.