Solid-State Lithium Battery Buffer Electrolyte for Dendrite-Free Interfaces
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Solution Overview
Problem
Solid-state lithium batteries face high interface impedance issues, requiring operation under high temperature or pressure conditions, and are prone to lithium dendrite formation leading to short circuits, which limits their safety and efficiency.
Innovation Solution
The use of a solid-state lithium battery design incorporating a solid electrolyte layer with a first buffer electrolyte layer and a microporous electrode layer, which reduces interface impedance and prevents lithium dendrite formation by maintaining an unblocked ion channel, allowing normal temperature and pressure operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pure solid-state electrolytes are used in lithium batteries, then safety and reliability are improved compared to liquid electrolytes, but interface impedance increases and the battery can only operate under high temperature or high pressure conditions
Solution Approach 1:
The patent introduces a buffer electrolyte layer as an intermediary between the solid electrolyte layer and the electrode layer. This buffer layer mediates the interface interaction, reducing interface impedance and enabling ion transport without requiring high temperature or pressure conditions, thus resolving the contradiction between safety improvement and operational ease
2Reliability
If pure solid-state electrolytes are used in lithium batteries, then electrolyte leakage and flammability are eliminated, but charging and discharging efficiency decreases due to high interface impedance
Solution Approach 1:
The buffer electrolyte layer serves as a mediator that reduces interface impedance between the solid electrolyte and electrode, thereby improving charging and discharging efficiency while maintaining the electrolyte stability benefits of solid-state electrolytes
3Device complexity
If solid electrolyte layer directly contacts electrode layer, then device structure is simplified, but lithium dendrites form and cause short circuits
Solution Approach 1:
The buffer electrolyte layer acts as a protective intermediary between the solid electrolyte and electrode, preventing direct contact that would lead to lithium dendrite formation and short circuits, thus improving reliability without significantly increasing structural complexity
Solution Approach 2:
The buffer electrolyte layer is designed with a microporous structure that allows ion transport while physically blocking lithium dendrites, preventing short circuits while maintaining a relatively simple overall battery structure
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
This design enables safe and efficient charging and discharging of solid-state lithium batteries at regular temperature and pressure conditions, enhancing their reliability and performance while preventing short circuits.
Implementation Method 1
solid electrolyte layer includes a first surface and a second surface opposite to each other... The first buffer electrolyte layer is embedded with the first surface of the solid electrolyte layer
Implementation Method 2
The first buffer electrolyte layer is embedded with the first surface of the solid electrolyte layer... reduces the interface impedance, enables the solid-state lithium battery to be charged, discharged and used under normal temperature and pressure conditions
Data Source
AI summary
A solid-state lithium battery includes a solid electrolyte layer, a first electrode layer structure, a second electrode layer structure, a first collector layer and a second collector layer. The first electrode layer structure includes a first buffer electrolyte layer and a first microporous electrode layer. The first buffer electrolyte layer is located between the first microporous electrode layer and the first surface of the solid electrolyte layer. The first buffer electrolyte layer is embedded with the first surface of the solid electrolyte layer. The second electrode layer structure is disposed on the second surface of the solid electrolyte layer. The first microporous electrode layer is disposed between the first collector layer and first buffer electrolyte layer. The second electrode layer structure is disposed between the second collector layer and the second surface of the solid electrolyte layer.