Non-Aqueous Battery Electrolyte for Stable High-Temperature SEI
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face challenges in maintaining high-temperature storage characteristics, particularly due to the decomposition of the solid electrolyte interface (SEI) film during high-temperature storage.
Innovation Solution
Incorporating 1,2-dimethoxyethane in the non-aqueous electrolyte at a content of less than or equal to 700 ppm, which preferentially adsorbs onto the negative electrode active material, stabilizing the SEI film and improving high-temperature storage characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 1,2-dimethoxyethane is added to the non-aqueous electrolyte to improve high-temperature storage characteristics, then the SEI film stability improves, but the battery performance deteriorates when the content exceeds 700 ppm
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration of 1,2-dimethoxyethane in the non-aqueous electrolyte to be 700 ppm or less. This specific parameter optimization allows the electrolyte to maintain sufficient SEI film stability improvement while avoiding the performance deterioration that occurs at higher concentrations, thus resolving the contradiction between reliability improvement and substance quantity control.
2Stability of the object's composition
If the content of 1,2-dimethoxyethane is increased to enhance SEI film stabilization, then high-temperature storage characteristics improve, but battery performance is adversely affected
Solution Approach 1:
The patent resolves this contradiction by optimizing the concentration parameter of 1,2-dimethoxyethane to 700 ppm or less. This parameter setting achieves the necessary SEI film stabilization for high-temperature storage while preventing adverse effects on overall battery performance, balancing composition stability with system reliability.
Solution Approach 2:
The patent applies partial action by adding only a small amount (700 ppm or less) of 1,2-dimethoxyethane to the electrolyte. This partial addition is sufficient to achieve the desired SEI film stabilization effect without causing the excessive action that would lead to performance deterioration, thus resolving the contradiction between stability improvement and performance maintenance.
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 use of 1,2-dimethoxyethane at controlled concentrations in the non-aqueous electrolyte significantly enhances the high-temperature storage characteristics of the battery by stabilizing the SEI film and reducing decomposition, thereby maintaining battery performance under severe environmental conditions.
Implementation Method 1
1,2-dimethoxyethane, which preferentially adsorbs onto the negative electrode active material
Data Source
AI summary
In an embodiment of the present invention, this non-aqueous electrolyte secondary battery comprises a positive electrode, a negative electrode, and a non-aqueous electrolyte and is characterised in that the non-aqueous electrolyte contains 1,2-dimethoxyethane and the amount of 1,2-dimethoxyethane is 700 ppm or less relative to the total mass of the non-aqueous electrolyte.