Halogenated Acid Anhydride Electrolyte for Battery Gas Suppression
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Solution Overview
Problem
Secondary batteries using electrolyte solutions with acid anhydrides face issues with oxidation and decomposition, leading to performance degradation and increased gas generation, which affects battery capacity and volume stability.
Innovation Solution
An electrolyte solution comprising a supporting salt, a nonaqueous solvent with low viscosity compounds (>50% by volume), and a halogenated cyclic acid anhydride, which improves wettability and film formation on electrodes, thereby suppressing gas generation during charge and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an acid anhydride is added to the electrolyte solution to form a protective film on the electrode surface, then the decomposition reaction of the electrolyte solution is suppressed, but the acid anhydride is oxidized and decomposed on the positive electrode, resulting in lowered battery performance
Solution Approach 1:
The patent introduces specific parameter constraints: the acid anhydride must have a boiling point of 150°C or higher, and the electrolyte solution must contain a cyclic carbonate and an open-chain carbonate in a specific volume ratio (30-70% cyclic carbonate, 70-30% open-chain carbonate). These parameter changes optimize the balance between protective film formation and suppression of oxidation/decomposition, resolving the contradiction between electrolyte stability and battery performance.
2Ease of operation
If conventional electrolyte solutions are used, then the battery can operate, but gas generation occurs during charge and discharge, affecting battery capacity and volume stability
Solution Approach 1:
The patent converts the potential harm of acid anhydride oxidation into a benefit by carefully selecting acid anhydrides with high boiling points (≥150°C) and optimizing the electrolyte composition. The acid anhydride forms a protective film that prevents further decomposition and gas generation, while the specific carbonate mixture ensures the acid anhydride remains stable during operation, transforming what could be a harmful decomposition reaction into a beneficial protective mechanism.
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 solution effectively reduces gas generation and maintains battery performance by enhancing the electrolyte's ability to form a protective film on electrodes, improving capacity retention and volume stability.
Implementation Method 1
forming a protective film on the surface of electrode by adding an additive to the electrolyte
Implementation Method 2
improving the electrolyte's ability to form a protective film on electrodes
Implementation Method 3
improves wettability and film formation on electrodes
Implementation Method 4
nonaqueous solvent containing a compound having a viscosity of 1.0 mPa-s or less
Data Source
AI summary
The present invention relates to an electrolyte solution comprising a supporting salt, a nonaqueous solvent containing a compound having a viscosity of 1.0 mPa-s or less in an amount of more than 50% by volume in the nonaqueous solvent, and a halogenated cyclic acid anhydride. According to the present invention, an electrolyte solution capable of suppressing gas generation is provided.