Electrolyte Additive Composition for Low-Impedance Stable SEI Membranes
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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 incorporated 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, then the electrochemical performance is improved, but gas generation occurs at high temperatures and cycling performance deteriorates
Solution Approach 1:
The patent combines multiple additives (first additive with formula 1 structure and second silane additive with formula 2 structure) into a single electrolytic solution formulation. The first additive contains elements M (alkali metal) and Y+ (monovalent cation) with specific molecular structure, while the second additive is a silane compound with unsaturated bonds. This combination creates synergistic effects that suppress gas generation while maintaining electrochemical performance, resolving the contradiction between improving reliability and preventing harmful gas generation.
Solution Approach 2:
The patent employs a composite additive system where the first additive (with specific molecular structure containing M and Y+) and second additive (silane with unsaturated bonds) work together to form a composite functional material in the electrolytic solution. This composite approach enables the formation of a stable SEI membrane that simultaneously improves electrochemical performance and prevents gas generation at high temperatures, addressing both aspects of the technical contradiction.
2Reliability
If a single additive is incorporated into the electrolytic solution, then the electrochemical performance is improved, but internal resistance increases at room and low temperatures
Solution Approach 1:
The patent merges the first additive (formula 1 with M and Y+) and second silane additive (formula 2 with unsaturated bonds) into a unified electrolytic solution system. This combination creates a balanced SEI membrane formation mechanism that reduces internal resistance at room and low temperatures while maintaining improved electrochemical performance, resolving the contradiction between these two parameters.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolytic solution by introducing specific additives with defined molecular structures (first additive with M and Y+, second silane additive with unsaturated bonds). This parameter change optimizes the SEI membrane properties to simultaneously improve electrochemical performance and reduce internal resistance across different temperature conditions, addressing the technical contradiction.
3Reliability
If a single additive is incorporated into the electrolytic solution, then the electrochemical performance is improved, but cycling performance deteriorates
Solution Approach 1:
The patent combines the first additive (formula 1 containing M and Y+) and second silane additive (formula 2 with unsaturated bonds) into a synergistic system. This merged additive composition forms a stable SEI membrane that simultaneously improves electrochemical performance and extends cycling life, resolving the contradiction between these two performance metrics by creating a more durable electrode-electrolyte interface.
Solution Approach 2:
The patent uses a composite additive system where the first additive (with specific molecular structure) and second silane additive (with unsaturated bonds) work together to create a composite protective layer on the electrode surface. This composite SEI membrane provides both improved electrochemical performance and enhanced cycling stability, addressing the contradiction between short-term performance and long-term durability.
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 the cycling performance and high-temperature stability of batteries by forming a structurally stable SEI membrane that reduces impedance and inhibits gas generation, thereby enhancing the battery's capacity retention and thermal stability.
Implementation Method 1
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.