Halogenated Lithium Phosphorous Sulfide Electrolyte With Lower-Heat Processing
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Solution Overview
Problem
Current lithium solid-state battery technologies face challenges with low conductivity and high temperature requirements for electrolyte production, making them inefficient and costly.
Innovation Solution
A solid electrolyte material comprising elements Li, T, X, and A, where T is selected from P, As, Si, Ge, Al, Sb, W, and B, X is selected from F, Cl, Br, I, and N, and A is S or Se, with specific X-ray diffraction peaks, is developed, allowing for the production of a high-conductivity electrolyte through a process involving milling and modest heat treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature (500° C.) heat treatment is applied to obtain crystalline material of high conductivity, then conductivity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the thermal processing parameters from conventional high-temperature treatment to a lower temperature range (200-400° C.). This parameter modification, combined with the specific chemical composition, enables crystallization and achieves high conductivity without requiring the complex 500° C. processing infrastructure, thereby simplifying manufacturing.
2Reliability
If high temperature (500° C.) heat treatment is applied, then crystalline material of high conductivity is obtained, but manufacturing cost increases
Solution Approach 1:
By changing the heat treatment temperature parameter from 500° C. to a lower range (200-400° C.), the patent reduces energy consumption and equipment requirements, directly lowering manufacturing costs while still achieving the necessary crystalline structure and conductivity through the optimized chemical composition.
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 new electrolyte material achieves conductivities of approximately 0.4 mS/cm at room temperature, reducing manufacturing complexity and costs while enhancing battery performance.
Implementation Method 1
the most common iodine-containing solid electrolyte (Li6PS5I) has low conductivity (1E-4 mS/cm at room temperature)
Implementation Method 2
The solid electrolyte material has peaks at 2θ=14.9°±0.50°, 20.4°±0.50°, and 25.4°±0.50° in X-ray diffraction measurement with Cu—Kα(1,2)=1.5418 Å
Data Source
AI summary
A solid electrolyte material comprises Li, T, X and A wherein T is at least one of P, As, Si, Ge, Al, Sb, W, and B; X is one or more halogens and/or N; A is one or more of S or Se. The solid electrolyte material has peaks at 14.9°±0.50°, 20.4°±0.50°, and 25.4°±0.50° in X-ray diffraction measurement with Cu—Kα(1,2)=1.5418Å and may include glass ceramic and/or mixed crystalline phases.