Non-Aqueous Electrolyte Additives for High-Temperature Battery Storage
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Solution Overview
Problem
Existing non-aqueous electrolyte solutions for secondary batteries face challenges in maintaining high-temperature storage characteristics, leading to increased gas generation and degradation of battery performance.
Innovation Solution
A non-aqueous electrolyte solution comprising a first compound represented by Formula (1) and a second compound represented by Formula (2), along with a non-aqueous solvent and an electrolyte, is used to improve high-temperature storage characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional non-aqueous electrolyte solutions are used, then basic battery function is maintained, but high-temperature storage characteristics deteriorate with increased gas generation and performance degradation
Solution Approach 1:
The patent introduces a mediator compound (cyclic carboxylate or cyclic carbonate with specific structural features) that acts as an intermediary substance between the electrode and the electrolyte solvent. This mediator forms a protective interface layer that prevents direct harmful interactions at high temperatures, thereby reducing gas generation while maintaining reliable battery storage characteristics.
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by incorporating specific cyclic carboxylate or cyclic carbonate compounds with controlled concentrations (0.1-10 wt%). This parameter change alters the electrochemical behavior of the system, enabling stable performance at elevated temperatures by suppressing decomposition reactions that generate gas.
2Reliability
If conventional non-aqueous electrolyte solutions are used, then basic battery function is maintained, but residual capacity and recovery capacity degrade at high temperatures
Solution Approach 1:
The patent applies preliminary action by having the mediator compound (cyclic carboxylate or cyclic carbonate) react first during initial charging cycles to form a stable Solid Electrolyte Interphase (SEI) layer on the electrode surface. This pre-formed protective layer prevents subsequent degradation reactions during storage, thereby preserving residual capacity and recovery capacity over extended periods at high temperatures.
Solution Approach 2:
The patent creates a composite electrolyte system combining conventional non-aqueous solvents with specific cyclic carboxylate or cyclic carbonate additives. This composite material approach leverages the beneficial properties of both components: the solvent provides ionic conductivity while the additive forms protective films, resulting in enhanced storage stability and capacity retention.
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 proposed electrolyte solution effectively reduces gas generation at high temperatures, maintains residual capacity, and enhances recovery capacity, thereby improving the overall performance of secondary batteries.
Implementation Method 1
the additive may be decomposed during first charging and discharging, and a coating film called a Solid Electrolyte Interphase (SEI) may be formed on a surface of an electrode
Implementation Method 2
the additive may be decomposed during first charging and discharging
Data Source
Figure 1
AI summary
A non-aqueous electrolyte solution for a secondary battery, containing a first compound represented by the following Formula (1), a second compound represented by the following Formula (2), a non-aqueous solvent, and an electrolyte.