Anode Coating for Lithium-Ion Battery Cycle Stability
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Solution Overview
Problem
Lithium-ion secondary batteries with high-capacity anode materials like tin and silicon face issues with electrolyte decomposition during charge and discharge cycles, leading to reduced discharge capacity and poor cycle characteristics.
Innovation Solution
An anode with a coating of metal salts represented by Chemical Formula 1 or metal salts of oxocarbonic acid is applied, enhancing the chemical stability and preventing electrolyte decomposition, thereby improving cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-capacity anode materials like tin and silicon are used, then battery capacity is improved, but electrolyte decomposition occurs during charge and discharge cycles
Solution Approach 1:
The patent applies a composite coating structure consisting of a first coating layer (oxide or nitride of the anode active material) and a second coating layer (lithium compound). This composite structure combines the protective properties of the oxide/nitride layer with the lithium-ion conductivity and stability provided by the lithium compound layer, effectively preventing electrolyte decomposition while maintaining high battery capacity
Solution Approach 2:
The patent changes the chemical composition and structure parameters of the anode surface by forming specific coating layers. The first coating layer transforms the surface chemistry to reduce reactivity with the electrolyte, while the second coating layer optimizes lithium-ion insertion/extraction properties, thereby improving cycle characteristics without sacrificing capacity
2Quantity of substance
If high-capacity anode materials like tin and silicon are used, then battery capacity is improved, but discharge capacity declines due to electrolyte decomposition
Solution Approach 1:
The dual-layer coating structure combines an oxide/nitride barrier layer with a lithium compound protective layer, creating a composite material system that prevents electrolyte decomposition and maintains stable discharge capacity over repeated charge-discharge cycles
Solution Approach 2:
The coating layers are formed preliminarily on the anode active material surface before battery operation. This preliminary protective action prevents direct contact between the high-capacity anode material and the electrolyte, thereby preventing capacity decline from the outset
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 coated anode significantly improves the chemical stability and cycle characteristics of lithium-ion batteries by preventing electrolyte decomposition, maintaining discharge capacity over repeated cycles.
Implementation Method 1
the coating includes at least one of a metal salt represented by Chemical Formula 1 or a metal salt of oxocarbonic acid... enhancing the chemical stability and preventing electrolyte decomposition
Data Source
AI summary
A coating on an anode active material that includes a metal salt with two or more sulfonates or a metal salt of oxocarbonic acid.