All Solid Lithium Battery Anode Layer With Twin Crystal Particles
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Solution Overview
Problem
All solid lithium batteries face challenges with low capacity durability due to large volume changes in anode active materials during charge and discharge, leading to stress and cracking within the anode layer.
Innovation Solution
Incorporating metal particles with two or more crystal orientations as anode active materials in the anode layer, which helps to moderate stress and improve durability, and applying a confining pressure of 3 MPa to 20 MPa to enhance capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal particles with single crystal orientation are used as anode active material, then the manufacturing process is simple, but the capacity durability is low due to large volume change and stress during charge and discharge
Solution Approach 1:
The patent applies composite materials by combining metal particles with different crystal orientations (including twin crystals) within the anode active material. This composite structure allows the material to accommodate volume changes during charge and discharge through the interaction of different crystal orientations, reducing stress and improving capacity durability while maintaining reasonable manufacturing complexity
Solution Approach 2:
The patent changes the crystal structure parameter of the metal particles from single orientation to multiple orientations (including twin crystals). This parameter change enables the material to better handle the mechanical stress induced by volume expansion and contraction during lithium insertion and extraction, thereby improving capacity durability without significantly complicating the manufacturing process
2Reliability
If high confining pressure is applied to the battery element, then capacity durability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs beforehand cushioning by incorporating twin crystals and multiple crystal orientations into the metal particles before battery assembly. This pre-designed internal stress distribution mechanism cushions the volume changes during charge and discharge, reducing the need for high confining pressure and simplifying manufacturing while maintaining capacity durability
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 anode layer with twin crystal particles effectively inhibits cracking and maintains excellent capacity durability even under low confining pressure, significantly improving the battery's performance.
Implementation Method 1
the metal particle has two kinds or more of crystal orientation in one particle
Implementation Method 2
the all solid lithium battery further comprises a confining member that applies a confining pressure to the thickness direction of the battery element, wherein the confining pressure is in a range of 3 MPa to 20 MPa
Data Source
AI summary
A main object of the present disclosure is to provide an all solid lithium battery with excellent capacity durability. The above object is achieved by providing an anode layer to be used in an all solid lithium battery, the anode layer comprising: a metal particle capable of being alloyed with Li, as an active material; and the metal particle has two kinds or more of crystal orientation in one particle.