Lithium-Ion Battery Electrolyte for High-Temperature Storage Recovery
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Solution Overview
Problem
Current electrolyte solutions for lithium-ion secondary batteries face challenges in maintaining recovery capacity after storage, particularly during high-temperature storage, leading to degradation and reduced capacity retention.
Innovation Solution
An electrolyte solution containing specific compounds with branched alkyl groups, such as tert-butyl, is introduced, which improves the steric structure and reduces degradation, enhancing recovery capacity and gas generation during high-temperature storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then the battery can operate normally, but the recovery capacity after high-temperature storage deteriorates
Solution Approach 1:
The patent introduces compounds with specific molecular structures (formulas 1-1 and 1-2) featuring branched alkyl groups at defined positions. These structural parameter changes in the electrolyte additives modify the SEI film properties, enabling improved recovery capacity after high-temperature storage while maintaining compositional stability
Solution Approach 2:
The electrolyte solution combines multiple components including cyclic carbonate, chain carbonate, and the novel compounds of formulas (1-1) and (1-2) with specific structural features. This composite electrolyte formulation creates a synergistic effect that simultaneously improves recovery capacity and maintains capacity retention during storage
2Duration of action of stationary object
If storage duration is extended, then the battery can be kept ready for use, but gas generation increases and capacity is lost
Solution Approach 1:
The electrolyte additives perform preliminary action by forming a stable SEI film on the electrode surfaces before storage begins. This pre-formed protective layer prevents subsequent gas generation and capacity loss during extended storage periods, allowing the battery to maintain readiness for use
3Speed
If storage temperature is high, then the battery can be quickly activated, but degradation accelerates and recovery capacity decreases
Solution Approach 1:
The electrolyte compounds provide beforehand cushioning by creating a thermally stable SEI film that protects the electrode from high-temperature degradation. This protective cushion allows the battery to withstand high-temperature storage conditions while maintaining recovery capacity and enabling quick activation
Data Source
AI summary
An electrolyte solution containing at least one compound (1) selected from the group consisting of a compound represented by the following formula (1-1) (wherein R111 to R113 are each individually a C1-C4 linear or branched alkyl group, and at least one selected from R111 to R113 is a C1-C4 branched alkyl group) and a compound represented by the following formula (1-2) (wherein R121 to R123 are each individually a C1-C4 linear or branched alkyl group, and at least one selected from R121 to R123 is a C1-C4 branched alkyl group). Also disclosed is an electrochemical device including the electrolyte solution, a lithium ion secondary battery including the electrolyte solution and a module including the electrochemical device or lithium ion secondary battery: