All-Solid Battery Electrolyte Layers for Short-Circuit Fire Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries using flammable organic solvents pose a risk of overheating and fire due to short circuits, necessitating the development of safer alternatives.
Innovation Solution
An all-solid rechargeable battery design featuring a negative electrode, a first solid electrolyte layer with rounded particles, a second solid electrolyte layer with sharp particles, and a positive electrode, where the first solid electrolyte layer has a thickness of 2 μm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flammable organic solvents are used as electrolytes in lithium-ion batteries, then ionic conductivity and electrochemical performance are improved, but safety deteriorates due to risk of overheating and fire
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid, fundamentally altering the safety parameters of the battery system. Solid electrolytes eliminate flammability while maintaining ionic conductivity, directly resolving the contradiction between performance and safety
Solution Approach 2:
The patent employs composite solid electrolyte structures combining multiple materials (e.g., sulfide-based solid electrolytes with oxide coatings or composite formulations) to achieve both high ionic conductivity and enhanced safety, demonstrating how composite materials can simultaneously address performance and safety requirements
2Quantity of substance
If solid electrolyte layer thickness is reduced to improve battery energy density, then volumetric energy density is improved, but manufacturing precision requirements increase to ensure uniform thickness and avoid defects
Solution Approach 1:
The patent employs slurry coating methods where the solid electrolyte slurry self-levels and forms uniform thin films through controlled drying and sintering processes, enabling precise thickness control (2 μm or less) without requiring extremely sophisticated manufacturing equipment
Solution Approach 2:
The patent utilizes thin film formation techniques to create uniformly thick solid electrolyte layers at the micrometer scale, demonstrating how advanced thin film fabrication methods can achieve the required precision for ultra-thin electrolyte layers
3Manufacturing precision
If rounded solid electrolyte particles are used to improve layer uniformity and reduce defects, then manufacturing quality is improved, but particle preparation complexity increases compared to conventional powder forms
Solution Approach 1:
The patent intentionally uses rounded or spherical solid electrolyte particles instead of angular powders, as the curved surfaces enable better packing density and more uniform layer formation during coating processes, directly improving manufacturing quality
Solution Approach 2:
The patent changes the morphological parameters of solid electrolyte particles from angular to rounded shapes through controlled synthesis methods, transforming the particle characteristics to achieve superior layer uniformity and reduce manufacturing defects
Data Source
AI summary
An all-solid rechargeable battery includes a negative electrode; a first solid electrolyte layer on one surface of the negative electrode; a second solid electrolyte layer on one surface of the first solid electrolyte layer, and a positive electrode on one surface of the second solid electrolyte layer, wherein the first solid electrolyte layer includes rounded first solid electrolyte particles, and the first solid electrolyte layer has a first thickness of 2 μm or less.