Silyl Group Electrolyte Additives for Viscosity and Stability
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Solution Overview
Problem
Conventional lithium-ion secondary batteries face issues with the high viscosity of electrolytic solutions containing silyl group-containing compounds, leading to decreased productivity and storage stability, as well as gas generation and deterioration of battery performance when used in high-voltage applications.
Innovation Solution
A composition comprising a silyl group-containing compound, a basic compound, and a silicon compound is added to the electrolytic solution, reducing viscosity and improving storage stability, while maintaining cycle characteristics and enhancing input-output characteristics of the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silyl group-containing compound is added to the electrolytic solution to improve storage stability and reduce gas generation, then the viscosity of the electrolytic solution increases, leading to decreased productivity and deteriorated input-output characteristics
Solution Approach 1:
The patent changes the chemical structure parameters of the silyl group-containing compound by introducing specific basic compounds and silicon compounds as additives. This modifies the molecular properties to reduce intermolecular forces and viscosity while maintaining the storage stability benefits of the silyl group-containing compound.
Solution Approach 2:
The patent creates a composite electrolytic solution system by combining the silyl group-containing compound with basic compounds and silicon compounds. This composite approach allows the system to achieve multiple functions: the silyl group-containing compound provides storage stability and gas suppression, while the basic and silicon compounds counteract the viscosity increase.
2Reliability
If a silyl group-containing compound is added to the electrolytic solution to improve storage stability, then gas generation is reduced, but the viscosity increases causing deteriorated input-output characteristics
Solution Approach 1:
The patent modifies the physical parameters of the electrolytic solution by adding basic compounds and silicon compounds that reduce viscosity. This allows the solution to maintain low resistance and good ion conductivity, preserving input-output characteristics while the silyl group-containing compound ensures storage stability and reduced gas generation.
Solution Approach 2:
The basic compounds and silicon compounds act as intermediary substances that mediate between the silyl group-containing compound and the electrolytic solution. They reduce the adverse viscosity effect of the silyl group-containing compound while allowing its beneficial storage stability and gas suppression properties to manifest.
3Productivity
If the viscosity of the electrolytic solution is reduced to improve productivity and input-output characteristics, then storage stability deteriorates and gas generation increases
Solution Approach 1:
The patent employs a composite electrolytic solution containing silyl group-containing compounds, basic compounds, and silicon compounds. This composite formulation achieves a balance where the silyl group-containing compound provides storage stability and gas suppression, while the basic and silicon compounds maintain low viscosity for high productivity and good input-output characteristics.
Solution Approach 2:
The patent optimizes the concentration parameters of each component in the electrolytic solution. By carefully controlling the amounts of silyl group-containing compounds, basic compounds, and silicon compounds, the patent achieves the optimal balance between storage stability, gas generation suppression, viscosity, and input-output characteristics.
Data Source
Figure 1
AI summary
The present invention addresses the problem of providing a composition for addition to electrolyte solutions, which improves storage stability of a silyl group-containing compound that is a useful additive for lithium ion secondary batteries. The description of this application sets forth a composition for addition to electrolyte solutions, which contains one or more silyl group-containing compounds (compound (a)) and one or more basic compounds and/or silicon compounds (compound (b)).