Sulfide Electrolyte Coated with Lithium Conductive Polymer
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Solution Overview
Problem
Lithium batteries using liquid electrolytes face issues with temperature increase and short circuiting, which can be mitigated by employing solid electrolytes, but these are often water-sensitive and require improved conductivity and manufacturing processes.
Innovation Solution
A solid electrolyte comprising a sulfide-based electrolyte coated with a water-resistant, lithium conductive polymer, such as polyethylene oxide, to enhance conductivity and reduce water sensitivity, along with a method of preparation involving dissolution, immersion, and drying to form a thin, effective coating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used instead of a liquid electrolyte, then safety is improved and manufacturing costs are reduced, but conductivity and water sensitivity need improvement
Solution Approach 1:
The patent applies composite materials by combining sulfide-based solid electrolyte with a water-resistant lithium conductive polymer coating. This composite structure maintains the safety benefits of solid electrolytes while adding a coating layer that improves water resistance and maintains conductivity, directly resolving the contradiction between safety improvement and conductivity maintenance.
Solution Approach 2:
The patent changes the physical and chemical parameters of the electrolyte surface by applying a coating layer with specific properties (water-resistant, lithium conductive). This parameter change allows the electrolyte to maintain high ionic conductivity while gaining improved water resistance, addressing the manufacturing precision concern.
2Object-affected harmful factors
If a coating film is added to improve water resistance, then water sensitivity is reduced, but device complexity increases
Solution Approach 1:
The patent uses a thin film coating approach, applying a water-resistant lithium conductive polymer layer on the solid electrolyte surface. This thin film structure provides effective water protection while minimizing structural complexity and maintaining the overall simplicity of the battery design.
Solution Approach 2:
The coating layer serves multiple functions simultaneously: it provides water resistance, maintains lithium ionic conductivity, and protects the underlying sulfide-based electrolyte. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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 resulting solid electrolyte exhibits improved proton conductivity, reduced water sensitivity, and increased safety, making it suitable for high-performance lithium batteries with enhanced cyclic characteristics and stability.
Implementation Method 1
a coating film including a water-resistant, lithium conductive polymer on the sulfide-based electrolyte
Implementation Method 2
a water-resistant, lithium conductive polymer on the sulfide-based electrolyte
Implementation Method 3
drying the mixture to form a solid electrolyte
Data Source
AI summary
A solid electrolyte includes a sulfide-based electrolyte and a coating film including a water-resistant, lithium conductive polymer on a surface of the sulfide-based electrolyte, a method of preparing the solid electrolyte, and a lithium battery including the solid electrolyte.