Sulfide Solid Electrolyte Production Without Mechanical Pulverization
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Solution Overview
Problem
Existing methods for producing sulfide solid electrolytes face challenges in achieving high ionic conductivity while maintaining a simple production process, as they often require complex mechanical treatments or result in large particle sizes, which hinder efficient ionic conduction.
Innovation Solution
A production method involving mixing raw materials containing lithium, sulfur, and phosphorus with a complexing agent without mechanical treatment, followed by heating and smoothing or mechanical processing to achieve a crystalline sulfide solid electrolyte with reduced particle size and enhanced ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particle size reduction is performed by conventional mechanical pulverization methods, then ionic conductivity is improved, but the production process becomes complicated and productivity decreases
Solution Approach 1:
The patent replaces conventional mechanical pulverization methods with a chemical reaction-based approach. By reacting lithium sulfide and phosphorus sulfide in a liquid phase to form a solid electrolyte precursor that is then heated to form the final product, the invention eliminates the need for complex mechanical treating machines while achieving fine particle sizes and high ionic conductivity
Solution Approach 2:
The patent changes the physical state parameters of the reaction system, using a liquid phase reaction environment to enable homogeneous mixing and reaction of raw materials. This liquid-phase synthesis approach followed by controlled heating transforms the material into a fine-particle solid electrolyte without requiring mechanical size reduction equipment
2Reliability
If particle size is reduced to improve ionic conduction paths, then contact interface between active substance and electrolyte is improved, but mechanical treating machines are required which complicates the process
Solution Approach 1:
The invention substitutes mechanical size reduction processes with a chemical synthesis approach that naturally produces fine particles. The liquid-phase reaction and subsequent heating process inherently creates a fine-particle solid electrolyte with good dispersion, eliminating the need for mechanical treating machines and maintaining manufacturing simplicity
Solution Approach 2:
The patent uses a liquid phase as an intermediary medium during the synthesis process. This liquid medium facilitates homogeneous mixing of raw materials and enables the formation of a well-dispersed solid electrolyte precursor, which after heating yields fine particles that improve ionic conduction paths without requiring mechanical intervention
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
This method effectively increases ionic conductivity of sulfide solid electrolytes without complicating the production process, reducing particle size and specific surface area, thereby improving ionic conduction paths.
Implementation Method 1
mixing a raw material inclusion containing at least one selected from a lithium atom, a sulfur atom and a phosphorus atom, and a complexing agent to obtain an electrolyte precursor
Implementation Method 2
heating the electrolyte precursor to obtain a complex degradate
Implementation Method 3
performing smoothing treatment on the complex degradate to obtain a smoothed complex degradate
Implementation Method 4
heating the smoothed complex degradate
Data Source
AI summary
The present invention addresses a problem of providing a production method for a sulfide solid electrolyte having a high ionic conductivity by pulverizing a sulfide solid electrolyte without complicating the production process. Provided is a production method for a crystalline sulfide solid electrolyte including mixing a raw material inclusion containing at least one selected from a lithium atom, a sulfur atom and a phosphorus atom, and a complexing agent without using a mechanical treating machine to obtain an electrolyte precursor, heating the electrolyte precursor to obtain a complex degradate, performing smoothing treatment on the complex degradate to obtain a smoothed complex degradate, and heating the smoothed complex degradate.