Secondary Battery Electrolyte Composition for Stable Anode SEI Films
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Solution Overview
Problem
Existing lithium secondary batteries face challenges in achieving improved life characteristics and high-temperature stability due to variations in anode, cathode, and electrolyte materials, necessitating a stable and high-ionic conductivity electrolyte solution.
Innovation Solution
An electrolyte solution for lithium secondary batteries incorporating a compound represented by Formula 1, which forms a stable solid electrolyte interphase (SEI) film on the anode surface, minimizing resistance and enhancing lithium movement, while using additives like LiPO2F2, unsaturated cyclic carbonates, and cyclic sulfones to improve cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte materials are used, then basic battery operation is achieved, but life characteristics and high-temperature stability are insufficient
Solution Approach 1:
The patent modifies the chemical structure of electrolyte additives by introducing specific functional groups (Formula 1 with substituents R1-R6) and adjusting molecular parameters to achieve optimal performance. This structural parameter change enables the electrolyte to form stable SEI films that improve battery life and high-temperature stability while maintaining compatibility across different battery configurations.
Solution Approach 2:
The patent employs composite electrolyte formulations combining multiple components including the novel compound of Formula 1, cyclic carbonates, chain carbonates, and lithium salts. This composite approach creates synergistic effects that enhance both reliability and adaptability, allowing the electrolyte to perform consistently across various anode, cathode, and electrolyte material combinations.
2Use of energy by moving object
If high voltage operation is achieved, then energy density is improved, but electrolyte reactivity and stability become problematic
Solution Approach 1:
The patent introduces compounds of Formula 1 as intermediary substances that mediate between the high-voltage electrode materials and the bulk electrolyte. These compounds preferentially react at the electrode interface to form protective SEI films, acting as intermediaries that prevent direct contact and harmful reactions between the high-voltage cathode/anode and the main electrolyte composition, thereby enabling stable high-voltage operation.
Solution Approach 2:
The patent adjusts the chemical composition parameters of the electrolyte by incorporating specific ratios of cyclic carbonates, chain carbonates, and the novel Formula 1 compound. This parameter optimization creates an electrolyte system with enhanced electrochemical stability window that can withstand high operating voltages while maintaining safety and performance.
3Reliability
If aqueous electrolyte is used, then safety is improved, but reactivity with lithium and voltage limitation occur
Solution Approach 1:
The patent employs organic electrolyte compounds that create an inert chemical environment at the electrode interfaces through形成的 SEI films. These films act as protective barriers that prevent harmful reactions between lithium and the electrolyte, while the overall organic electrolyte composition maintains chemical inertness and stability, enabling safe high-voltage operation without the reactivity issues of aqueous systems.
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 electrolyte solution enhances room-temperature cycle performance and prevents anode degradation by forming a stable SEI film, thereby improving the battery's life characteristics and high-temperature stability.
Implementation Method 1
which forms a stable solid electrolyte interphase (SEI) film on the anode surface, minimizing resistance and enhancing lithium movement
Implementation Method 2
An organic electrolyte solution is prepared by dissolving a lithium salt in an organic solvent
Implementation Method 3
have high ionic conductivity and a high dielectric constant
Data Source
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AI summary
The present disclosure relates to a compound for an electrolyte solution, a compound for an electrolyte solution additive, an electrolyte solution material, an electrolyte solution additive, an electrolyte solution for a secondary battery, and a secondary battery, and provides an electrolyte solution for a secondary battery, including a novel compound, or an isomer thereof.