All-Solid-State Battery Electrode With LGPS-Glass Ceramic Electrolyte
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sulfide solid electrolytes in all-solid-state batteries face challenges in achieving both low battery resistance and water resistance, with the LGPS type crystal structure improving water resistance but increasing battery resistance due to its hardness, which limits the filling factor and interface formation with active materials.
Innovation Solution
Incorporating a glass ceramic sulfide solid electrolyte with a specific mass fraction and smaller average particle size to reduce battery resistance while maintaining water resistance, by mixing it with an LGPS type crystal structure sulfide solid electrolyte, thereby improving the filling factor and interface formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LGPS type crystal structure sulfide solid electrolyte is used, then water resistance is improved, but battery resistance increases
Solution Approach 1:
The patent uses a composite solid electrolyte layer combining LGPS type crystal structure sulfide solid electrolyte (providing water resistance) with glass ceramic sulfide solid electrolyte (providing low battery resistance and high filling factor). This composite structure resolves the contradiction by integrating materials with complementary properties, allowing the system to achieve both water resistance and low battery resistance simultaneously.
2Reliability
If LGPS type crystal structure sulfide solid electrolyte is used, then water resistance is improved, but filling factor decreases
Solution Approach 1:
The composite solid electrolyte layer combines LGPS type crystal structure sulfide solid electrolyte (hard, water-resistant) with glass ceramic sulfide solid electrolyte (softer, higher filling factor). The glass ceramic component fills voids and interfaces more effectively, increasing the overall filling factor while the LGPS component maintains water resistance.
3Object-affected harmful factors
If glass ceramic sulfide solid electrolyte is increased to improve filling factor, then battery resistance decreases, but water resistance deteriorates
Solution Approach 1:
The patent optimizes the mass fraction parameter of glass ceramic sulfide solid electrolyte to be 5-20%, creating an optimal balance point. Below 5%, water resistance is insufficient; above 20%, battery resistance increases. This parameter optimization resolves the contradiction by identifying the precise composition ratio where both water resistance and battery resistance performance are satisfied.
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 combination of LGPS and glass ceramic sulfide solid electrolytes reduces battery resistance and enhances water resistance, achieving a balance between both performance metrics within optimal mass fraction and particle size ranges.
Implementation Method 1
During compression of the electrode, the glass ceramic is crushed first, with the result that a clearance between the LGPS and the active material is provided with the glass ceramic.
Implementation Method 2
By mixing the glass ceramic with the LGPS, the increase in battery resistance can be reduced.
Data Source
AI summary
An electrode for all-solid-state battery includes a first sulfide solid electrolyte, a second sulfide solid electrolyte, and an active material. The first sulfide solid electrolyte has an LGPS type crystal structure. The second sulfide solid electrolyte is a glass ceramic. A mass fraction of the second sulfide solid electrolyte with respect to a sum of the first sulfide solid electrolyte and the second sulfide solid electrolyte is more than 5% and 20% or less.