Bismaleimide Electrolyte Suppresses Gas in High-Temperature Batteries
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Solution Overview
Problem
Lithium ion secondary batteries experience gas generation and deterioration in high-temperature environments, leading to reduced capacity and cycle characteristics, which existing solutions have not adequately addressed.
Innovation Solution
A non-aqueous electrolyte solution containing a bismaleimide compound with a specific structure, along with cyclic carbonates and nitrile compounds, is used to suppress gas generation and enhance battery performance at high temperatures, improving residual capacity and cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used in lithium ion secondary batteries, then the batteries can operate and provide capacity, but gas generation occurs and deterioration happens in high-temperature environments, leading to reduced capacity and cycle characteristics
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing a specific bismaleimide compound with controlled content (0.01-5 wt%), which modifies the electrolyte's chemical stability and suppresses gas generation reactions at high temperatures, thereby improving cycle characteristics while reducing harmful gas generation
Solution Approach 2:
The bismaleimide compound acts as an intermediary substance that mediates between the electrode and the electrolyte, forming a stable interface layer that prevents direct harmful reactions, reduces gas generation, and improves the overall reliability and cycle life of the battery in high-temperature environments
2Reliability
If existing electrolyte additives are used to improve battery characteristics, then some performance aspects are improved, but gas generation suppression and long-term cycle characteristic improvement are not adequately addressed
Solution Approach 1:
The patent employs a composite electrolyte system combining the bismaleimide compound with conventional electrolyte components (cyclic carbonates, chain carbonates, and lithium salts), creating a synergistic formulation that simultaneously suppresses gas generation and improves residual capacity retention over extended cycle life
Data Source
AI summary
There is provided a non-aqueous electrolyte solution enabling fabrication of a non-aqueous electrolyte solution secondary battery which achieves suppressed gas generation when used under high temperature environment and the improved residual capacity of the battery, and the improved cycle characteristic thereof, and further, is excellent in discharge load characteristic (dischargeable at high rate), and a non-aqueous electrolyte solution secondary battery using the non-aqueous electrolyte solution. There is provided a non-aqueous electrolyte solution for use in a non-aqueous electrolyte solution secondary battery including a positive electrode having a positive electrode active material capable of absorbing and releasing a metal ion and a negative electrode having a negative electrode active material capable of absorbing and releasing a metal ion, which solution contains a bismaleimide compound having a specific structure, and a non-aqueous electrolyte solution secondary battery using the solution.