Non-Aqueous Battery Electrolyte for Stable Electrode Surface Films
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Solution Overview
Problem
Nonaqueous electrolytic solution batteries face issues with gas generation, internal resistance increase, and cycle properties due to inadequate surface film formation and reactivity at electrodes, particularly with cyclic sulfite and linear carboxylate compounds.
Innovation Solution
A nonaqueous electrolytic solution comprising specific cyclic sulfur-containing compounds, anion-containing compounds, and lithium transition metal-based compounds is used, which forms a stable surface film on electrodes to improve direct current resistance retention, gas suppression, and capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a negative electrode surface film is formed on the negative electrode, then side reaction suppression is improved, but the surface film is fragile and side reactions still occur
Solution Approach 1:
The patent uses a composite electrolyte system where the cyclic sulfite forms an initial surface film on the negative electrode and the cyclic carboxylate compound reinforces this film to improve its stability and strength. The synergistic interaction between these two components creates a more robust surface film that effectively suppresses side reactions without being fragile, addressing both the side reaction suppression and film strength requirements.
2Productivity
If a linear carboxylate having high reduction reactivity is used in the nonaqueous electrolytic solution, then initial stage reaction activity is improved, but side reaction on negative electrode cannot be suppressed and internal resistance increases
Solution Approach 1:
The patent applies preliminary anti-action by having the cyclic sulfite and cyclic carboxylate compound form a stable surface film on the negative electrode before the linear carboxylate can cause harmful side reactions. This pre-formed protective film acts as a barrier that prevents the highly reactive linear carboxylate from causing excessive side reactions and internal resistance increase, while still allowing the necessary initial stage reactions to proceed.
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 suppresses gas generation and internal resistance increase, enhances recovery capacity retention, and improves cycle performance by forming a stable surface film on electrodes.
Implementation Method 1
a nonaqueous electrolytic solution which can improve a direct current resistance (DCR) retention rate after high-temperature storage and suppress an increase in a gas generation amount after high-temperature storage by being used in a nonaqueous electrolytic solution battery
Implementation Method 2
a cyclic sulfite having a carbon-carbon double bond is effective in suppressing a side reaction at a negative electrode
Data Source
AI summary
The present invention relates to: [1] a nonaqueous electrolytic solution containing a compound (A) represented by formula (I); and [2] a nonaqueous electrolytic solution battery including a positive electrode, a negative electrode, and the nonaqueous electrolytic solution.