Method for producing a crystalline solid electrolyte, a crystalline solid electrolyte, and an electrode combined material and a lithium ion battery using it
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Solution Overview
Problem
Conventional solid electrolytes in fully solid batteries face challenges with oxidation resistance, leading to increased internal resistance, and existing methods for grain refinement do not effectively suppress granulation and specific surface area increase while maintaining high ionic conductivity.
Innovation Solution
A method for producing a crystalline sulfide solid electrolyte involves mixing raw materials containing lithium, sulfur, phosphorus, and halogen atoms, heating the mixture to form a crystalline product, and then subjecting it to a grinding treatment with a specific integrated power to amorphize the surface, thereby enhancing oxidation resistance and maintaining high ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional grain refinement techniques are used to reduce particle diameter, then contact interface formation is improved, but granulation and specific surface area increase occur leading to reduced ionic conductivity
Solution Approach 1:
The patent applies parameter changes by precisely controlling the integrated power of the grinding treatment within 1-500 Wh/kg to achieve the desired particle size reduction while preventing excessive granulation and specific surface area increase that would harm ionic conductivity
Solution Approach 2:
The patent uses partial action by limiting the grinding treatment to a specific integrated power range, applying just enough mechanical energy to reduce particle size for improved contact interfaces, but not exceeding the threshold that would cause harmful granulation and conductivity loss
2Manufacturing precision
If the solid electrolyte is subjected to grinding treatment to refine grains, then electrode contact is improved, but oxidation resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the integrated power parameter of the grinding treatment to a specific range (1-500 Wh/kg), which controls the degree of surface modification to achieve grain refinement while preventing excessive surface damage that would reduce oxidation resistance
3Reliability
If particle diameter is reduced to improve contact interface, then ion conduction paths are improved, but specific surface area increases causing granulation
Solution Approach 1:
The patent applies parameter changes by controlling the integrated power of grinding within a specific range to achieve the optimal balance between particle size reduction for improved ion conduction and preventing excessive reduction that would cause granulation and instability in particle size distribution
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 approach results in a crystalline sulfide solid electrolyte with superior oxidation resistance, suppressed granulation, and reduced specific surface area increase, while maintaining high ionic conductivity, suitable for use in electrode combined materials and lithium ion batteries.
Implementation Method 1
subjecting the crystalline product to a grinding treatment to amorphize at least a part of a surface of the crystalline product
Implementation Method 2
heating the reaction product to provide a crystalline product
Data Source
AI summary
Provided are a method for producing a crystalline sulfide solid electrolyte, the method including mixing a raw material-containing substance that contains a lithium atom, a sulfur atom, a phosphorus atom, and a halogen atom to provide a reaction product, heating the reaction product to provide a crystalline product, and subjecting the crystalline product to a grinding treatment to amorphize at least a part of a surface of the crystalline product, the grinding treatment being performed with an integrated power of 1 (Wh/kg) or more and 500 (Wh/kg) or less; a crystalline sulfide solid electrolyte; and an electrode combined material and a lithium ion battery using it.