Fluorinated Electrolyte Solution for High-Temperature Battery Stability
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Solution Overview
Problem
Conventional electrolyte solutions for lithium ion secondary batteries degrade during storage, leading to reduced capacity retention and increased gas production, especially at high temperatures.
Innovation Solution
An electrolyte solution comprising a fluorinated acyclic ester, a fluorinated carbonate, and a cyclic acid anhydride, which helps in suppressing capacity retention loss and gas production when stored at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional electrolyte solutions are stored at high temperatures, then storage stability is improved, but capacity retention decreases and gas production increases
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing a specific fluorinated cyclic carbonate compound with the formula CF3CFXCOOCH2CF2CFXCOOCH3 where X is H or F. This compound represents a specific chemical structure parameter change that addresses the degradation issue. The fluorinated cyclic carbonate compound acts as a stabilizing agent that prevents electrolyte decomposition at high temperatures, thereby maintaining both storage stability and capacity retention simultaneously.
2Stability of the object's composition
If conventional electrolyte solutions are stored at high temperatures, then storage stability is improved, but gas production increases
Solution Approach 1:
The patent introduces a fluorinated cyclic carbonate compound with specific molecular structure (CF3CFXCOOCH2CF2CFXCOOCH3) to change the chemical composition parameters of the electrolyte. This compound suppresses gas-generating side reactions during high-temperature storage by forming stable protective films on electrode surfaces, thereby reducing gas production while maintaining storage stability.
3Quantity of substance
If electrolyte solution composition is optimized for high energy density, then battery capacity is improved, but storage stability deteriorates
Solution Approach 1:
The patent creates a composite electrolyte system by combining conventional electrolyte components with a fluorinated cyclic carbonate compound. This composite approach allows the electrolyte to maintain high energy density characteristics from the conventional components while the fluorinated compound provides storage stability through its unique chemical structure and film-forming properties, achieving both high capacity and stable storage performance.
Data Source
AI summary
The present invention provides an electrolyte solution in which a decrease in capacity retention is suppressed and an increase in gas production is suppressed even when stored at high temperatures. Provided is an electrolyte solution containing: a compound (1) represented by formula (1): CF3CFX11COOR11, wherein X11 is a hydrogen atom, a fluorine atom, or a C1-C3 alkyl group in which hydrogen atoms are optionally replaced by fluorine atoms, and R11 is a C1-C3 alkyl group in which hydrogen atoms are optionally replaced by fluorine atoms; a fluorinated carbonate; and a cyclic acid anhydride.