Alkali Metal Layer for Solid Electrolyte Ion Conduction
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Solution Overview
Problem
All-solid-state batteries face challenges in forming an effective ion-conducting path between the solid electrolyte layer and the electrode layer, leading to poor charge/discharge characteristics.
Innovation Solution
A member for an electricity storage device is designed with a solid electrolyte layer, an alkali metal layer, and an electrode layer, where the alkali metal layer facilitates ion conduction between the solid electrolyte and the electrode, enhancing adhesion and ion conductivity by containing an alkali metal ion-conducting solid electrolyte and materials capable of absorbing and releasing alkali metal ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer is used in all-solid-state batteries, then safety is improved by eliminating combustible organic electrolytes, but charge/discharge characteristics deteriorate due to poor ion conduction between the solid electrolyte and electrode
Solution Approach 1:
An alkali metal layer is introduced as an intermediary between the solid electrolyte layer and the electrode layer. This intermediate layer facilitates ion conduction by providing a pathway for alkali metal ions to move between the solid electrolyte and electrode, thereby improving charge/discharge characteristics while maintaining the safety benefits of the solid electrolyte system.
Solution Approach 2:
The invention creates a composite structure consisting of multiple layers: solid electrolyte layer, alkali metal layer, and electrode layer. This composite architecture combines the safety advantages of solid electrolytes with the superior ion conduction properties of the alkali metal intermediate layer, achieving both safety and high performance.
2Productivity
If an alkali metal layer is added between the solid electrolyte and electrode, then ion conduction is improved, but device structure becomes more complex
Solution Approach 1:
The battery structure is segmented into distinct functional layers: the solid electrolyte layer for safety and ion confinement, the alkali metal layer for enhanced ion conduction, and the electrode layer for electrochemical reactions. This segmentation allows each layer to be optimized for its specific function while working together as an integrated system.
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 configuration improves charge/discharge characteristics and cycle stability by forming a robust ion-conducting path, increasing the efficiency and capacity of the battery.
Implementation Method 1
a solid electrolyte layer containing an alkali metal ion-conducting solid electrolyte
Implementation Method 2
an alkali metal layer laid on the solid electrolyte layer and containing an alkali metal; and an electrode layer laid on the alkali metal layer and containing a material capable of absorbing and releasing alkali metal ions
Implementation Method 3
The alkali metal contained in the alkali metal layer is preferably diffused into the negative electrode layer
Data Source
AI summary
Provided is a member for an electricity storage device and an electricity storage device in each of which alkali metal ions are used as carrier ions and which can improve charge/discharge characteristics. A member for an electricity storage device includes: a solid electrolyte layer 2 containing an alkali metal ion-conducting solid electrolyte; an alkali metal layer 3 laid on the solid electrolyte layer 2 and containing an alkali metal; and an electrode layer laid on the alkali metal layer 3 and containing a material capable of absorbing and releasing alkali metal ions.