Li-Ion Battery Electrolyte Composition for High-Temperature Cycle Stability
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Solution Overview
Problem
Existing electrolyte solutions for lithium-ion secondary batteries face challenges in improving high-temperature storage characteristics and cycle characteristics, particularly when used in applications like automobiles.
Innovation Solution
The use of a novel electrolyte solution containing specific fluorinated acrylic acid ester and acrylamide compounds, represented by certain chemical formulas, which enhance the performance of electrochemical devices by reducing gas generation during high-temperature storage and charge/discharge cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then basic battery function is maintained, but high-temperature storage characteristics and cycle characteristics deteriorate
Solution Approach 1:
The patent modifies the chemical structure of electrolyte additives by introducing fluorinated groups and specific functional groups (ether, amino, hydroxyl) to change the chemical parameters of the electrolyte composition. This structural modification enables the electrolyte to form more stable SEI films at high temperatures, directly addressing the deterioration of high-temperature storage characteristics while maintaining electrolyte stability.
Solution Approach 2:
The patent combines multiple functional groups (fluorinated groups, ether groups, amino groups, hydroxyl groups) within the same electrolyte additive molecules to create composite chemical structures. These composite structures provide multiple beneficial effects simultaneously: fluorinated groups enhance thermal stability, while ether/amino/hydroxyl groups facilitate SEI film formation, thereby improving both high-temperature storage characteristics and cycle characteristics.
2Reliability
If conventional electrolyte solutions are used, then basic charge/discharge function is maintained, but cycle characteristics deteriorate
Solution Approach 1:
The patent changes the chemical parameters of electrolyte additives by incorporating fluorinated groups and specific functional groups (ether, amino, hydroxyl). These parameter changes enable the electrolyte to form more stable and protective SEI films on electrode surfaces, which prevents electrolyte decomposition and electrode degradation during repeated charge/discharge cycles, thereby extending battery cycle life.
Solution Approach 2:
The electrolyte additives in the patent perform preliminary protective action by forming stable SEI films on electrode surfaces before significant degradation occurs. This pre-formed protective layer cushions the electrodes against harmful effects during subsequent charge/discharge cycles, preventing cumulative damage and extending the duration of battery operation.
3Quantity of substance
If existing electrolyte compositions are used, then standard performance is achieved, but gas generation increases during high-temperature storage
Solution Approach 1:
The patent modifies the chemical parameters of electrolyte additives by introducing fluorinated groups and specific functional groups. These parameter changes increase the thermal stability of the electrolyte composition, preventing decomposition reactions that generate gas during high-temperature storage, thereby reducing gas generation volume while improving storage stability.
Solution Approach 2:
The patent converts potentially harmful high-temperature conditions into beneficial effects by using fluorinated electrolyte additives that form exceptionally stable SEI films at elevated temperatures. This protective film prevents further electrolyte decomposition and gas generation, transforming the harmful high-temperature environment into a condition that produces stable, protective surface layers.
Data Source
AI summary
An electrolyte solution containing at least one compound represented by formula (1-1) and formula (1-2), formula (1-1) being:where R101 is an optionally fluorinated C1-C7 alkyl group, an optionally fluorinated C2-C8 alkenyl group, an optionally fluorinated C2-C9 alkynyl group, or an optionally fluorinated C6-C12 aryl group, and optionally contains at least one selected from O, Si, S, and N in a structure; and formula (1-2) being:where R102 and R103 are (i) each individually H, F, an optionally fluorinated C1-C7 alkyl group, an optionally fluorinated C2-C7 alkenyl group, an optionally fluorinated C2-C9 alkynyl group, or an optionally fluorinated C5-C12 aryl group, or (ii) hydrocarbon groups binding to each other to form a 5-membered or 6-membered hetero ring with a nitrogen atom; and R102 and R103 each optionally contain at least one selected from O, S, and N in a structure.