Silyloxy Additive for Lithium Battery Electrolyte
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Solution Overview
Problem
Lithium secondary batteries face challenges in maintaining capacity retention and high-temperature performance due to electrode degradation from acid components like HF in the electrolyte, leading to voltage drops and reduced lifespan.
Innovation Solution
An additive for electrochemical devices, represented by specific chemical formulas, is used to neutralize acid components and form a protective membrane on the electrode surface through oxidative polymerization, preventing further decomposition and enhancing high-temperature storage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery operates at high voltage and high temperature to improve power output, then the power delivery is enhanced, but electrode degradation accelerates and capacity retention deteriorates
Solution Approach 1:
The additive performs preliminary protective actions by neutralizing acid components like HF before they can attack the electrode, and by forming a protective membrane on the electrode surface in advance. This preliminary protection prevents electrode degradation that would otherwise occur during high-voltage, high-temperature operation, allowing the battery to maintain both high power output and good capacity retention.
2Temperature
If the battery is stored at high temperature to maintain performance, then the operational capability is preserved, but voltage drop increases and storage efficiency decreases
Solution Approach 1:
The additive applies preliminary anti-action by neutralizing acid components and forming a protective membrane before high-temperature storage begins. This pre-established protection prevents the electrochemical reactions that would otherwise cause voltage drop during storage, allowing the battery to be stored at higher temperatures without significant energy loss or performance degradation.
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 additive effectively minimizes electrode damage, improves high-temperature cycle properties, and extends the lifespan of lithium secondary batteries by forming a protective membrane that reduces voltage drops and enhances capacity, output, and overall battery performance.
Implementation Method 1
An additive for an electrochemical device according to embodiments of the present specification neutralizes an acid component such as HF in an electrolyte of an electrochemical device
Implementation Method 2
an additive for an electrochemical device according to embodiments of the present specification forms an effective protective membrane on an electrode surface by an oxidative polymerization reaction
Data Source
AI summary
The present specification relates to an additive for an electrochemical device including a compound having a silyloxy group, and an electrolyte, an electrode and an electrochemical device.