Silicon Monoxide Anode Composition for Better Cycle Stability
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Solution Overview
Problem
Conventional silicon monoxide materials used in lithium batteries suffer from low initial efficiency and poor cycle performance, and the selection of suitable materials for carbon coating is not well-guided, leading to inconsistent battery performance.
Innovation Solution
A silicon monoxide material with specific chromaticity, particle size distribution, and crystal structure parameters is developed, which can be used alone or in combination with carbon nanotubes, to enhance electrochemical properties and improve cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon monoxide is used as a negative electrode material to improve energy density, then battery capacity increases, but initial efficiency and cycle performance deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chromaticity parameters (L, a, b values) and particle size distribution of silicon monoxide material. By adjusting these physical parameters to specific ranges, the material achieves both high capacity and good cycle performance, resolving the contradiction between quantity and reliability
Solution Approach 2:
The patent uses composite materials by coating silicon monoxide particles with carbon material. This composite structure combines the high capacity advantage of silicon monoxide with the stability and conductivity benefits of carbon, thereby improving both initial efficiency and cycle performance while maintaining high battery capacity
2Reliability
If carbon coating is applied to silicon monoxide to improve performance, then initial efficiency increases, but material selection complexity increases
Solution Approach 1:
The patent establishes specific parameter ranges for chromaticity (L, a, b values) and particle size distribution that indicate suitability for carbon coating. This provides clear selection criteria, reducing material selection complexity while ensuring good initial efficiency after coating
Solution Approach 2:
The patent replaces complex qualitative material selection with quantitative parameter measurement. By using chromaticity parameters and particle size distribution as objective selection criteria, the complex material selection process is simplified into measurable and controllable parameters
Data Source
AI summary
A negative electrode material for a lithium battery and a lithium ion secondary battery including same are provided. The negative electrode material for a lithium battery includes a silicon monoxide satisfying, in terms of chromaticity, 30≤L≤50, 3≤a≤10, and 1.5≤b≤10, and preferably 35≤L≤45, 4≤a≤9, and 4≤b≤10, and having a total color difference ΔE of 39≤ΔE≤50 relative to black.