Halogenated Cyclic Ester Carbonate Electrolyte for Battery Swelling
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Solution Overview
Problem
Secondary batteries, particularly lithium-ion and lithium metal batteries, face challenges in maintaining superior cycle characteristics, storage characteristics, and preventing swelling due to increased power consumption and frequent charge-discharge cycles, which affects their performance and safety.
Innovation Solution
An electrolyte composition is developed that includes a solvent with halogenated cyclic ester carbonate, specifically formulated to enhance chemical stability, incorporating halogenated cyclic ester carbonates, unsaturated carbon bond cyclic ester carbonates, halogenated chain ester carbonates, sultones, and acid anhydrides, along with lithium salts like lithium hexafluorophosphate, to improve the battery's performance and prevent swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte compositions are used, then the battery can operate, but cycle characteristics and storage characteristics deteriorate due to chemical instability
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of cyclic ester carbonate through halogenation at specific positions (alpha and beta carbons relative to the carbonyl group). This structural parameter change enhances chemical stability while maintaining electrochemical performance, directly resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent employs composite materials by combining halogenated cyclic ester carbonate with other electrolyte components (non-halogenated cyclic ester carbonate, chain ester carbonate, and lithium salt) in specific ratios. This composite approach synergistically improves cycle characteristics and storage characteristics while maintaining overall chemical stability.
2Reliability
If conventional electrolyte compositions are used, then the battery can operate, but storage characteristics deteriorate due to chemical instability
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of cyclic ester carbonate through halogenation at specific positions (alpha and beta carbons relative to the carbonyl group). This structural parameter change enhances chemical stability while maintaining electrochemical performance, directly resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent employs composite materials by combining halogenated cyclic ester carbonate with other electrolyte components (non-halogenated cyclic ester carbonate, chain ester carbonate, and lithium salt) in specific ratios. This composite approach synergistically improves cycle characteristics and storage characteristics while maintaining overall chemical stability.
3Reliability
If conventional electrolyte compositions are used, then the battery can operate, but battery swollenness increases affecting safety
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of cyclic ester carbonate through halogenation at specific positions (alpha and beta carbons relative to the carbonyl group). This structural parameter change enhances chemical stability while maintaining electrochemical performance, directly resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent employs composite materials by combining halogenated cyclic ester carbonate with other electrolyte components (non-halogenated cyclic ester carbonate, chain ester carbonate, and lithium salt) in specific ratios. This composite approach synergistically improves cycle characteristics and storage characteristics while maintaining overall chemical stability.
4Reliability
If halogenated cyclic ester carbonate is used to improve chemical stability, then cycle characteristics improve, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of cyclic ester carbonate through halogenation at specific positions (alpha and beta carbons relative to the carbonyl group). This structural parameter change enhances chemical stability while maintaining electrochemical performance, directly resolving the contradiction between reliability and compositional stability.
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 proposed electrolyte composition significantly enhances cycle characteristics, storage characteristics, and prevents swelling, leading to improved battery performance, capacity retention, and safety by stabilizing the electrolyte and forming protective films on electrodes, thus extending the battery's lifespan and reliability.
Implementation Method 1
a solvent and an electrolyte salt, wherein the solvent contains halogenated cyclic ester carbonate shown in Formula (1)
Implementation Method 2
The electrolyte contains a solvent and an electrolyte salt
Data Source
AI summary
A secondary battery capable of achieving superior cycle characteristics, superior storage characteristics, and superior swollenness characteristics is provided. The secondary battery includes a cathode, an anode, and an electrolyte containing a solvent and an electrolyte salt. The solvent contains halogenated cyclic ester carbonate. The halogenated cyclic ester carbonate is a cyclic compound that has one or more fluorine groups, one or more fluorinated alkyl groups, and a carbonyl group.