A sulfide-based solid electrolyte particle having a crystal phase of a cubic argyrodite-type crystal structure composed of Li, P, S and a halogen (Ha), wherein good contact between the sulfide-based solid electrolyte particles and positive or negative electrode active material particles is secured a
A sulfide-based solid electrolyte particle having a crystal phase of a cubic argyrodite-type crystal structure composed of Li, P, S and a halogen (Ha), wherein good contact between the sulfide-based solid electrolyte particles and positive or negative electrode active material particles is secured and improvements in the rate characteristic and the cycle characteristic are attained. The ratio (ZHa2/ZHa1) of an element ratio ZHa2 of the halogen (Ha) at the position of 5 nm in depth from the particle surface to an element ratio ZHa1 of the halogen (Ha) at the position of 100 nm in depth from the particle surface is 0.5 or lower and the ratio (ZO2/ZA2) of an element ratio ZO2 of oxygen to the total ZA2 of element ratios of P, S, O, and the halogen (Ha) at the position of 5 nm in depth from the particle surface is 0.5 or higher, as measured by XPS.
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1. A sulfide-based solid electrolyte particle, comprising a crystal phase of a cubic argyrodite-type crystal structure comprising lithium (Li), phosphorus (P), sulfur (S) and a halogen (Ha), wherein a ratio (ZHa2/ZHa1) of an element ratio ZHa2 of the halogen (Ha) at a position, in terms of an SiO2 s
1. A sulfide-based solid electrolyte particle, comprising a crystal phase of a cubic argyrodite-type crystal structure comprising lithium (Li), phosphorus (P), sulfur (S) and a halogen (Ha), wherein a ratio (ZHa2/ZHa1) of an element ratio ZHa2 of the halogen (Ha) at a position, in terms of an SiO2 sputter rate, of 5 nm in depth from the particle surface to an element ratio ZHa1 of the halogen (Ha) at a position, in terms of the SiO2 sputter rate, of 100 nm in depth from the particle surface is 0.5 or lower, as measured by X-ray photoelectron spectroscopy (XPS); anda ratio (ZO2/ZA2) of an element ratio ZO2 of oxygen to a total ZA2 of element ratios of phosphorus (P), sulfur (S), oxygen (O) and the halogen (Ha) at the position, in terms of the SiO2 sputter rate, of 5 nm in depth from the particle surface is 0.5 or higher, as measured by XPS. 2. The sulfide-based solid electrolyte particle according to claim 1, wherein a ratio (ZHa2/ZA2) of an element ratio ZHa2 of the halogen (Ha) to a total ZA2 of element ratios of phosphorus (P), sulfur (S), oxygen (O) and the halogen (Ha) at the position, in terms of SiO2 sputter rate, of 5 nm in depth from the particle surface is 0.1 or lower. 3. The sulfide-based solid electrolyte particle according to claim 1, wherein a ratio (ZHa1/ZA1) of an element ratio ZHa1 of the halogen (Ha) to a total ZA1 of element ratios of phosphorus (P), sulfur (S), oxygen (O) and the halogen (Ha) at the position, in terms of SiO2 sputter rate, of 100 nm in depth from the particle surface is 0.03 to 0.3, as measured by XPS. 4. The sulfide-based solid electrolyte particle according to claim 2, wherein a ratio (ZHa1/ZA1) of an element ratio ZHa1 of the halogen (Ha) to a total ZA1 of element ratios of phosphorus (P), sulfur (S), oxygen (O) and the halogen (Ha) at the position, in terms of SiO2 sputter rate, of 100 nm in depth from the particle surface is 0.03 to 0.3, as measured by XPS. 5. An electrode material for a lithium secondary battery, comprising: a sulfide-based solid electrolyte particle according to claim 1; and a positive electrode active material and/or a negative electrode active material. 6. A lithium secondary battery, having a layer comprising a sulfide-based solid electrolyte particle according to claim 1.
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