Secondary Battery Electrolyte Coating for Stable Capacity Retention
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Solution Overview
Problem
Lithium secondary batteries face degradation in lifespan and output due to side reactions between active material particles and the electrolyte, leading to mechanical and chemical damage, which affects their stability and capacity characteristics.
Innovation Solution
An electrolyte solution for secondary batteries is developed, comprising a lithium salt, a non-aqueous organic solvent, and a silatrane-based compound that forms a coating layer on the negative electrode active material, limiting direct contact with the electrolyte and enhancing the bonding force of the coating layer, thereby improving stability and capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the composition and structure of the active material are changed to enhance the stability of active material particles, then the stability is improved, but the conductivity is lowered and the output of the secondary battery is degraded
Solution Approach 1:
A silatrane-based compound is introduced as an intermediary substance that forms a coating layer on the surface of active material particles. This coating layer acts as a mediator that simultaneously provides stability to prevent particle degradation and maintains conductivity to preserve battery output, resolving the contradiction between stability enhancement and conductivity maintenance
Solution Approach 2:
The invention changes the chemical composition parameter by incorporating a silatrane-based compound with specific molecular structure (containing silicon, nitrogen, and oxygen atoms in a particular arrangement). This parameter change enables the formation of a coating layer with optimized properties that balances stability and conductivity requirements
2Productivity
If active material particles are repeatedly charged and discharged, then the battery capacity is utilized, but side reactions with the electrolyte cause mechanical and chemical damage reducing lifespan
Solution Approach 1:
The silatrane-based compound forms a protective coating layer on the active material particles before they undergo repeated charge-discharge cycles. This preliminary protective action prevents subsequent mechanical and chemical damage from side reactions with the electrolyte, enabling sustained capacity utilization over extended lifespan
Solution Approach 2:
The coating layer formed by the silatrane-based compound acts as a cushioning barrier that absorbs and mitigates the harmful effects of side reactions between active material particles and the electrolyte. This beforehand cushioning protects the particles from mechanical cracking and chemical degradation during repeated cycling
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 electrolyte solution enhances the high-temperature storage and capacity characteristics of secondary batteries by forming a stable coating layer on the negative electrode, reducing volume change and reactivity, and improving the overall lifespan and output of the batteries.
Implementation Method 1
a silatrane-based compound that forms a coating layer on the negative electrode active material, limiting direct contact with the electrolyte and enhancing the bonding force of the coating layer
Data Source
AI summary
An electrolyte solution for a secondary battery according to an exemplary embodiment includes a lithium salt, a non-aqueous organic solvent, and a silatrane-based compound represented by Chemical Formula 1. By including the electrolyte solution for a secondary battery according to an exemplary embodiment, a secondary battery can exhibit improved storage characteristics and improved capacity characteristics.