Solid Electrolyte of Lithium Secondary Battery and Sulfide Compound for Said Solid Electrolyte
AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsTsukasa Takahashi, Takashi Chikumoto, Takahiro Ito, Hideo Uesugi
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Abstract
As a novel sulfide compound having a low elastic modulus while retaining high ion conductivity, a sulfide compound for a solid electrolyte of a lithium secondary battery that includes a crystal phase of a cubic argyrodite type crystal structure, and is represented by the compositional formula: Li7−xPS6−xClyBrz, wherein x in the compositional formula satisfies x=y+z and 1.0<x≤1.8, and a ratio, z/y, of the molar ratio of Br to the molar ratio of Cl is from 0.1 to 10.0.
Claims10
A solid electrolyte for a lithium secondary battery, comprising a sulfide compound, the sulfide compound comprising a crystal phase of a cubic argyrodite type crystal structure, and being represented by the compositional formula:
- Li7−xPS6−xClyBrz, wherein x in the compositional formula satisfies x=y+z and 1.0<x≤1.8, and a ratio, z/y, of the molar ratio of Br to the molar ratio of Cl is from 0.1 to 10.0, and wherein the sulfide compound having an average particle diameter (D50) of from 0.1 μm to 10 μm, where the average particle diameter (D50) is obtained by the laser diffractive scattering particle size distribution measurement method.
Dependencies are inferred from the claim text.