All Solid State Battery Anode Porous Matrix Design
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Solution Overview
Problem
Conventional all-solid-state lithium-ion batteries face issues with energy density and electrode lifespan due to volume expansion and breakage caused by lithium oxidation and reduction reactions, leading to potential short circuits when using lithium metal as a counter electrode.
Innovation Solution
The battery design incorporates a first anode portion with a pore structure and a second anode portion made of metal foil, utilizing amorphous and crystalline sulfide-based solid electrolytes, respectively, to prevent volume expansion and electrode breakage, along with a manufacturing method that forms these layers to enhance ion and electron conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is directly used as a counter electrode in the all-solid-state cell, then energy density is improved, but the lithium anode portion expands and breaks or lithium grows to the solid electrolyte layer causing short circuits
Solution Approach 1:
The anode is divided into two distinct portions: a first anode portion containing solid electrolyte particles, conductive material particles, and binder in a matrix providing ion and electron conduction paths, and a second anode portion comprising metal foil. This segmentation allows the first anode portion to manage lithium reactions and prevent volume expansion while the second anode portion maintains high energy density, resolving the contradiction between energy density and reliability
Solution Approach 2:
The first anode portion acts as an intermediary layer between the solid electrolyte layer and the second anode portion. It provides a controlled environment for lithium oxidation and reduction reactions, preventing direct contact between lithium metal and the solid electrolyte layer, thereby avoiding lithium growth and short circuits while maintaining the energy density benefits of lithium metal
2Quantity of substance
If lithium metal is directly used as a counter electrode, then capacity is increased, but volume expansion occurs during charging and discharging leading to electrode breakage
Solution Approach 1:
The first anode portion is designed with a porous matrix structure containing solid electrolyte particles, conductive material particles, and binder. This porous structure accommodates volume changes during lithium oxidation and reduction reactions, preventing stress concentration and electrode breakage while maintaining high lithium capacity through the second anode portion metal foil
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 energy density and electrode lifespan by managing lithium reactions and reducing the risk of short circuits, while maintaining high energy output characteristics.
Implementation Method 1
a solid electrolyte layer; the first anode portion includes a second solid electrolyte
Implementation Method 2
lithium ions in the cathode are reduced at the anode counter electrode in a first charging process
Implementation Method 3
lithium ions in the cathode are reduced at the anode counter electrode in a first charging process
Data Source
AI summary
An all-solid-state battery includes: a cathode substrate; a cathode portion; a solid electrolyte layer; an anode portion; and an anode substrate. The cathode portion includes a cathode active material, a first solid electrolyte, a conductive material, and a binder, the anode portion is configured by a first anode portion having a pore structure and a second anode portion having metal foil, and the first anode portion includes a second solid electrolyte, a conductive material, and a binder.