Oxygen-Tuned Silicon Clathrate Anodes for Low-Expansion Charging
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Solution Overview
Problem
Silicon clathrate electrode active materials experience significant expansion during charging, which needs to be further suppressed to enhance the performance of lithium-ion batteries.
Innovation Solution
A silicon clathrate electrode active material with a specific range of oxygen content (0-19.4% by mass) and a clathrate type II structure, combined with a sulfide solid electrolyte in a negative electrode mixture, is used to form a solid-state lithium-ion battery, which reduces expansion during charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If silicon electrode active material is used, then high energy densification is achieved, but large expansion during charging occurs
Solution Approach 1:
The patent changes the chemical composition parameters of the silicon clathrate by controlling the oxygen content within a specific range (0.03-19.4 wt%). This parameter optimization modifies the crystal structure properties to reduce expansion during charging while preserving the high capacity characteristics of silicon-based materials.
Solution Approach 2:
The patent employs silicon clathrate as a composite material structure where silicon atoms are enclosed in a cage-like framework. This composite architecture provides both high energy density and structural stability, reducing expansion during charging compared to conventional silicon materials.
2Volume of moving object
If silicon clathrate electrode active material is used, then expansion during charging is suppressed, but further suppression is needed for optimal performance
Solution Approach 1:
The patent optimizes the oxygen content parameter within a precise range (0.03-19.4 wt%) to achieve the最佳 balance between expansion suppression and charging reaction uniformity. This parameter control ensures reliable and uniform charging reactions while maintaining low expansion.
Data Source
Figure 1
AI summary
The present disclosure provides a silicon clathrate electrode active material having low expansion during charging and a solid-state lithium-ion battery comprising such a silicon clathrate electrode active material. The silicon clathrate electrode active material of the present disclosure comprises greater than 0% by mass and less than 19.4% by mass of oxygen atoms. The solid-state lithium-ion battery of the present disclosure comprises the negative electrode active material layer of the present disclosure. The negative electrode active material layer of the present disclosure contains the negative electrode mixture of the present disclosure. The negative electrode mixture of the present disclosure comprises a silicon clathrate electrode active material and a solid electrolyte.