Sulfide Solid Electrolyte Production via Segmented Mixing
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Solution Overview
Problem
Sulfide solid electrolytes described in prior literature face challenges with insufficient Li ion conductivity and prolonged production times, particularly for Li2S—P2S5—LiI—LiBr-based sulfide solid electrolytes.
Innovation Solution
A method involving the mixing and grinding of lithium sulfide and lithium bromide, followed by the addition and reaction with diphosphorus pentasulfide and lithium iodide, significantly shortens production time while enhancing Li ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Li2S—P2S5—LiI—LiBr-based sulfide solid electrolyte is produced by mixing all raw materials at once, then Li ion conductivity is improved, but production time is prolonged
Solution Approach 1:
The production process is divided into two distinct stages: first mixing Li2S and LiBr, then adding P2S5 and LiI. This segmentation allows the reaction to proceed more efficiently, achieving high Li ion conductivity without the prolonged production time required when all materials are mixed simultaneously.
Solution Approach 2:
Li2S and LiBr are mixed and ground together in advance before adding the remaining materials. This preliminary action prepares the base mixture in an optimal state, enabling the subsequent reaction with P2S5 and LiI to proceed faster while maintaining high conductivity.
2Productivity
If Li2S—P2S5—LiI—LiBr-based sulfide solid electrolyte is produced by stepwise mixing, then production time is shortened, but Li ion conductivity may be compromised
Solution Approach 1:
The stepwise mixing process is strategically segmented into two phases: (1) mixing Li2S and LiBr, and (2) adding P2S5 and LiI. This specific segmentation maintains Li ion conductivity while reducing production time compared to mixing all materials at once.
Solution Approach 2:
The mixing parameters are optimized by controlling the order of material addition and the grinding conditions. This parameter optimization ensures that the stepwise process achieves both high conductivity and reduced production time.
3Productivity
If Li2S and LiBr are mixed and ground together first, then production efficiency is improved, but material homogeneity may be affected
Solution Approach 1:
Li2S and LiBr are preliminarily mixed and ground together to form a homogeneous base mixture. This preliminary action ensures uniform distribution of these components before adding P2S5 and LiI, maintaining overall material homogeneity while improving production efficiency.
Solution Approach 2:
The grinding process is specifically designed to achieve homogeneous mixing of Li2S and LiBr particles. This homogeneity is maintained through controlled grinding conditions, ensuring uniform material distribution throughout the final product.
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 method produces a sulfide solid electrolyte with high Li ion conductivity and reduces production time, utilizing a sulfur-based material that facilitates the production of a sulfide solid electrolyte with improved performance.
Implementation Method 1
mixing and grinding lithium sulfide and lithium bromide
Implementation Method 2
adding phosphorus sulfide and lithium iodide thereto and reacting them
Data Source
AI summary
Provided are a method for producing a sulfide solid electrolyte having a high Li ion conductivity, in which the production time can be greatly reduced, and a sulfur-based material that can be used in the production method for a sulfide solid electrolyte. The invention relates to a method for producing a sulfide solid electrolyte containing a lithium element, a sulfur element, a phosphorus element, an iodine element and a bromine element, which includes mixing and grinding lithium sulfide and lithium bromide followed by adding phosphorus sulfide and lithium iodide thereto and reacting them, and relates to a sulfur-based material.