Sulfide Solid Electrolyte Reduction Resistance
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Solution Overview
Problem
Current sulfide solid electrolyte materials lack sufficient reduction resistance, which is a critical issue for the development of high-performance lithium batteries.
Innovation Solution
A sulfide solid electrolyte material with a specific composition and crystal structure, including peaks at 2θ=30.26° in X-ray diffraction measurements and a composition of Li(3.14−x)Si(0.34−x)P(0.70+x)S(3.32−z)O(0.68+z) or Li(4−x−4y)Si(1−x+y)P(x)S(4−2a−z)O(2a+z), is developed to enhance reduction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sulfide solid electrolyte materials are used, then the battery can achieve high energy density, but the reduction resistance is insufficient leading to poor stability
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters (x, y, z) within specific ranges to optimize the sulfide solid electrolyte material. By adjusting these parameters, the invention achieves both high reduction resistance and compositional stability, resolving the technical contradiction between reliability and stability.
Solution Approach 2:
The patent employs composite materials by combining multiple elements (Li, Si, P, S, O) in specific proportions to create a composite sulfide solid electrolyte material. This composite approach enables the material to simultaneously exhibit high reduction resistance and compositional stability, addressing the contradiction between reliability and stability.
2Reliability
If the crystal structure is modified to improve reduction resistance, then the material stability may be compromised
Solution Approach 1:
The patent utilizes parameter changes by optimizing the crystal structure parameters through controlled element substitution. By adjusting the compositional parameters within specific ranges, the invention achieves improved reduction resistance while maintaining crystal structure stability, resolving the technical contradiction between reliability and structural stability.
3Reliability
If element substitution is performed to enhance reduction resistance, then the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by defining specific ranges for compositional parameters (x, y, z) that balance reduction resistance improvement with manufacturability. These parameter ranges are optimized to achieve high reduction resistance while maintaining reasonable manufacturing precision requirements.
Solution Approach 2:
The patent employs local quality by allowing specific elements to be substituted at particular positions in the crystal structure according to defined compositional ranges. This localized substitution approach enables improvement of reduction resistance while maintaining overall compositional control and manufacturing feasibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The material exhibits improved reduction resistance, high Li ion conductivity, and stable interfaces, leading to enhanced battery performance and safety.
Implementation Method 1
high Li ion conductivity
Implementation Method 2
favorable reduction resistance
Data Source
AI summary
The problem of the present invention is to provide a sulfide solid electrolyte material with favorable reduction resistance. The present invention solves the problem by providing a sulfide solid electrolyte material having a peak at a position of 2θ=30.26°±1.00° in X-ray diffraction measurement using a CuKα ray, and having a composition of Li(4−x−4y)Si(1−x+y)P(x)S(4−2a−z)O(2a+z) (a=1−x+y, 0.65≤x≤0.75, −0.025≤y≤0.1, −0.2≤z≤0).