Electrolyte Additive Composition for Stable SEI and Low Gas Generation
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Solution Overview
Problem
Lithium-ion and sodium-ion batteries face issues such as gas generation at high temperatures, high internal resistance, and poor cycling performance, which degrade their electrochemical performance.
Innovation Solution
An additive composition comprising a first additive with a specific compound structure and a silane additive, including unsaturated bonds, is introduced into the electrolytic solution to form a stable SEI membrane with reduced impedance, preventing side reactions and enhancing cycling and high-temperature performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single additive is incorporated into the electrolytic solution to improve electrochemical performance, then the battery shows enhanced cycling performance, but gas generation occurs at high temperatures and internal resistance increases at low temperatures
Solution Approach 1:
The patent employs a composite additive system comprising multiple additives with distinct functions: a cyclic carbonate additive (EC, PC) that forms stable SEI membrane, a chain carbonate additive (DMC, DEC) that maintains electrolyte fluidity, and a silane additive that suppresses gas generation. This composite approach allows the electrolyte to simultaneously achieve good cycling performance, low gas generation, and stable performance across temperature ranges, resolving the contradiction between improving cycling performance and eliminating harmful gas generation.
2Reliability
If a single additive is incorporated into the electrolytic solution to improve electrochemical performance, then the battery shows enhanced cycling performance, but high internal resistance occurs at room temperature and low temperatures
Solution Approach 1:
The patent uses a composite electrolyte system combining cyclic carbonate additives (EC, PC) that form stable SEI membranes improving cycling performance, with chain carbonate additives (DMC, DEC) that maintain low viscosity and high ionic conductivity at low temperatures. This composite approach ensures low internal resistance across temperature ranges while maintaining good cycling performance, resolving the contradiction between enhancing cycling performance and reducing energy loss.
3Quantity of substance
If high-voltage and high-temperature systems are developed to increase energy density, then the energy density of lithium-ion and sodium-ion batteries is improved, but cycling performance and high-temperature performance are degraded
Solution Approach 1:
The patent introduces silane additives as intermediary substances that mediate between the electrode and electrolyte in high-voltage and high-temperature systems. The silane additives form protective films on the electrode surface that suppress parasitic reactions and gas generation, allowing the battery to operate at high voltages and temperatures while maintaining good cycling performance. This intermediary approach enables high energy density systems to achieve both high performance and reliability.
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 additive composition improves cycling performance and high-temperature stability by forming a structurally stable SEI membrane, reducing impedance, and inhibiting gas generation, thereby enhancing battery performance.
Implementation Method 1
An additive composition comprising a first additive with a specific compound structure and a silane additive, including unsaturated bonds, is introduced into the electrolytic solution to form a stable SEI membrane with reduced impedance, preventing side reactions
Implementation Method 2
The silane additive includes unsaturated bond(s)
Data Source
AI summary
The present application provides an additive composition, as well as an electrolytic solution and a battery thereof, wherein the additive composition comprises a first additive and a second additive; the first additive comprises a compound having a structure represented by formula 1, and the second additive comprises a silane additive. The additive composition provided by the present application is able to improve the cycling performance and high-temperature performance of the battery when used in an electrolytic solution.