Electrolyte Additive Composition for High-Temperature Battery Stability
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Solution Overview
Problem
Secondary batteries face issues such as electrolyte decomposition at high temperatures leading to gas generation, swelling, and reduced ion dynamics, resulting in safety hazards and decreased cycle life due to increased impedance and slow ion processes.
Innovation Solution
An electrolyte additive comprising specific compounds that form a stable, low-impedance interface film on the electrode surface, reducing gas production and improving ion transport, achieved by a combination of additives that undergo redox polymerization and acid removal reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional electrolytes are used, then the battery can operate, but at high temperature the electrolyte decomposes and generates gas causing swelling and safety hazards
Solution Approach 1:
The patent introduces a multifunctional additive containing phosphorus, boron, and sulfur atoms as an intermediary substance. This additive mediates between the electrolyte and electrode material by forming a protective interface film that prevents direct harmful interactions. The additive decomposes first to create a stable SEI layer that acts as a barrier, preventing the electrolyte from decomposing at high temperatures and generating gas.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by incorporating specific compounds with phosphorus, boron, and sulfur atoms. This parameter change transforms the electrolyte's behavior at high temperatures - the new composition enables formation of a more thermally stable interface film that prevents decomposition and gas generation while maintaining operational functionality.
2Speed
If conventional electrolytes are used, then the battery can function, but ion dynamics are slow leading to increased impedance and reduced cycle life
Solution Approach 1:
The patent changes the chemical parameters of the interface film by incorporating phosphorus, boron, and sulfur-containing compounds. This creates an interface film with optimized properties - lower impedance for faster ion transport while maintaining structural stability for extended cycle life. The specific molecular structure parameters of the additive determine the film's ion conductivity and mechanical properties.
Solution Approach 2:
The patent creates a composite interface film structure by combining multiple elements (phosphorus, boron, sulfur) in a single additive molecule. This composite approach allows the interface film to simultaneously achieve fast ion dynamics through certain molecular groups while maintaining stability through other groups, resolving the contradiction between speed 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 formulation enhances battery stability and conductivity, reducing internal resistance and extending cycle life by forming a stable interface film that prevents electrolyte decomposition and improves ion transport.
Implementation Method 1
the above-mentioned first additive, second additive, and third additive may be used simultaneously, so that a stable and low-impedance interface film may be formed on an electrode surface
Implementation Method 2
the above-described third additive may be polymerized on the electrode surface to form long polymer chains, thereby forming the stable and low-impedance interface film
Implementation Method 3
improving ion transport... forming a stable interface film that prevents electrolyte decomposition and improves ion transport
Implementation Method 4
the fourth additive acts synergistically with the first additive, the second additive, and the third additive to decompose in advance at an early stage of battery formation through a carbon chain ring-opening reaction, thereby forming an interface film
Implementation Method 5
a stable and low-impedance interface film can be formed on an electrode surface, reducing impedance and gas production of the battery... preventing electrolyte decomposition
Data Source
AI summary
Provided are an electrolyte additive, an electrolyte, and a battery. The electrolyte additive includes a first additive, a second additive, and a third additive. The first additive includes a compound represented by formula 1:where: R1 is selected from C atom or O atom; R2 is selected fromR3 is selected from methylene,R4 is selected fromand at least one of R2, R3, and R4 contain sulfur atom. The second additive includes at least one of a compound represented by formula 2 or a compound represented by formula 3:where X includes P atom or B atom. The third additive includes a compound represented by formula 4: R—N—C—O formula 4, where R includes at least one of alkyl, O═C═N-substituted alkyl, cycloalkyl, O—C—N-substituted cycloalkyl, aryl, or O—C—N-substituted aryl.