Sulfide Solid Electrolyte Heat Generation Reduction
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Solution Overview
Problem
Lithium ion batteries using sulfide solid electrolytes face issues with heat generation when the anode reaches high temperatures, leading to potential battery failures due to excessive heat distribution.
Innovation Solution
A method for producing a sulfide solid electrolyte with high lithium ion conductivity by preparing Li3PS4 with a γ structure and non-crystallizing a mixture containing LiX, then heating it within a specific temperature range to reduce heat generation during reactions with the anode material at around 315°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sulfide solid electrolyte material is obtained by non-crystallizing a raw material composition containing Li2S, P2S5, LiI and LiBr and heating it at 195°C or more, then high lithium ion conductivity is achieved, but excessive heat is generated when the electrolyte reacts with charged anode material at around 315°C
Solution Approach 1:
The patent changes the heating temperature parameter from 195°C or more to a specific range of 150-190°C. This parameter modification prevents the formation of excessive reactive components in the sulfide solid electrolyte, thereby reducing heat generation at 315°C while maintaining adequate lithium ion conductivity
Solution Approach 2:
The patent converts the harmful effect of overheating (which causes excessive heat generation) into a beneficial controlled heating process. By deliberately limiting the heating temperature to 150-190°C, the method creates an electrolyte that undergoes controlled reactions at lower temperatures, preventing the harmful 315°C heat generation event
2Reliability
If the battery temperature locally reaches around 315°C due to internal short-circuit, then heat is generated by the reaction between sulfide solid electrolyte and anode material, but this heat spreads to surrounding areas and generates more heat in the entire battery
Solution Approach 1:
The patent applies preliminary anti-action by pre-modifying the sulfide solid electrolyte through controlled heating at 150-190°C. This preliminary treatment creates an electrolyte structure that is less prone to excessive heat generation, thereby preventing the harmful heat spread effect before it can occur during internal short-circuit conditions
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 results in a sulfide solid electrolyte that significantly reduces heat generation during high-temperature reactions, enhancing the safety and performance of lithium ion batteries by limiting heat spread within the battery.
Implementation Method 1
the non-crystallized second step mixture is heated in a temperature range of more than 150° C. and less than 190° C.
Implementation Method 2
the non-crystallized second step mixture is heated in a temperature range of more than 150° C. and less than 190° C.
Data Source
AI summary
The present invention is to provide a method for producing such a sulfide solid electrolyte that it has high lithium ion conductivity and the total amount of heat generated by the reaction with the charged anode material that proceeds at around 315° C., is reduced. Disclosed is a method for producing a sulfide solid electrolyte, wherein the method includes: a first step of preparing Li3PS4 having a γ structure, and a second step in which a second step mixture that contains the Li3PS4 having the γ structure obtained in the first step and LiX (where X is halogen) is non-crystallized, and the non-crystallized second step mixture is heated in a temperature range of more than 150° C. and less than 190° C.