Non-Aqueous Electrolyte Additives for Storage Capacity Retention
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries experience capacity decrease and deterioration in cycle characteristics during storage due to the reaction of cyano ester compounds in their electrolytic solutions.
Innovation Solution
A non-aqueous electrolytic solution containing a compound represented by Formula (1) and a cyclic sulfuric acid ester, which suppresses capacity decrease and cycle characteristic deterioration by optimizing the composition and content of the additives in the electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additives are added to improve battery performance, then capacity retention is enhanced, but the complexity of the electrolytic solution composition increases
Solution Approach 1:
The cyclic carboxylate compound serves multiple functions simultaneously: it acts as an additive that improves capacity retention during storage, serves as a reaction inhibitor to protect cycle characteristics, and functions as a stabilizer for the electrolytic solution. This multi-functionality reduces the need for multiple separate additives, thereby managing composition complexity while achieving multiple performance benefits.
Data Source
AI summary
A non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a non-aqueous electrolytic solution including a predetermined cyano ester compound and a cyclic sulfuric acid ester.