Hybrid Electrolyte for Solid-State Battery Contact
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Solution Overview
Problem
Solid-state lithium batteries face challenges in maintaining effective contact between electrode active materials and solid electrolytes, leading to increased battery resistance and reduced energy density due to the solid nature of the electrolyte, which can result in poor battery characteristics and safety concerns related to flammable organic solvents in traditional lithium-ion batteries.
Innovation Solution
A hybrid electrolyte comprising an inorganic solid electrolyte and an organic electrolyte with an organic salt containing a halogen-substituted organic cation is used, which reduces interfacial resistance and volume changes during charge and discharge, improving energy density and safety by eliminating the need for high-pressure processing and enhancing adhesion between electrolyte particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used instead of an electrolytic solution, then safety is improved by eliminating flammable organic solvents, but contact between electrode active material and solid electrolyte is insufficient, leading to increased battery resistance
Solution Approach 1:
The patent uses a composite structure consisting of solid electrolyte particles dispersed in an electrolytic solution. This composite approach combines the safety benefits of solid electrolytes (eliminating pure flammable solvents) with the good contact properties of liquid electrolytes, thereby resolving the contradiction between safety and contact quality.
Solution Approach 2:
The invention creates different local environments: regions with solid electrolyte particles provide safety, while the surrounding electrolytic solution ensures good contact and ion transport. This local differentiation allows simultaneous achievement of safety and effective contact without requiring uniform solid electrolyte throughout.
2Quantity of substance
If a solid electrolyte is used, then energy density can be improved, but the solid nature of the electrolyte causes poor contact and increased resistance, reducing battery characteristics
Solution Approach 1:
By creating a composite electrolyte system with solid electrolyte particles suspended in electrolytic solution, the patent achieves both high energy density (through solid electrolyte content) and good contact quality (through liquid solution medium), resolving the contradiction between quantity and contact precision.
3Manufacturing precision
If isostatic pressing is applied to increase contact between anode layer and solid electrolyte, then contact is improved, but the process requires high pressure, consumes much energy, and causes temperature increase during sintering
Solution Approach 1:
The patent extracts the problematic solid electrolyte layer and replaces it with a composite electrolyte system that inherently provides good contact without requiring high-pressure isostatic pressing. This eliminates the need for energy-intensive pressing processes while maintaining excellent contact between anode layer and electrolyte.
Data Source
AI summary
A hybrid electrolyte includes: an inorganic solid electrolyte; and an organic electrolyte, wherein the organic electrolyte includes an organic salt including an organic cation and an organic anion, and the organic cation includes a halogen. An electrode and a solid-state secondary battery each includes the hybrid electrolyte.