Non-Aqueous Battery Electrolyte Composition for Stable OCV
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries, such as lithium ion batteries, require lengthy finishing processes to stabilize the battery state due to significant open circuit voltage (OCV) variations immediately after assembly, necessitating a reduction in OCV variation and internal resistance to shorten these processes.
Innovation Solution
Incorporating a non-aqueous electrolyte with a fluorine-containing chain carboxylic acid ester and trifluoroethanol, where the ester constitutes 10 vol% or more of the electrolyte volume excluding the salt, and trifluoroethanol is present in 0.1 to 2 mass% with respect to the ester, enhances ion conductivity and stabilizes the OCV by forming a high-quality coating on the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional non-aqueous electrolyte compositions are used, then the battery can operate, but the OCV varies significantly immediately after assembly, requiring long finishing processes
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing fluorine-containing chain carboxylic acid ester with specific molecular structure (Formula 1) and controlling its content at 10 vol% or more, along with trifluoroethanol at 0.1 to 2 mass% relative to the ester. This parameter change in electrolyte composition directly reduces OCV variation and shortens finishing process time.
Solution Approach 2:
The patent creates a composite electrolyte system combining fluorine-containing chain carboxylic acid ester (RCOOCH2CF3) with trifluoroethanol and other conventional electrolyte components. This composite material approach leverages the synergistic effect between the fluorine-containing ester and trifluoroethanol to form a stable coating on electrodes, reducing OCV variation and enabling shorter finishing processes.
2Productivity
If the electrolyte composition is optimized to reduce OCV variation, then finishing processes can be shortened, but the electrolyte composition becomes more complex
Solution Approach 1:
The patent simplifies the complexity management by focusing on key parameters: fluorine-containing chain carboxylic acid ester content (≥10 vol%) and trifluoroethanol content (0.1 to 2 mass% relative to ester). By controlling these specific parameters within defined ranges, the patent achieves reduced OCV variation and shortened finishing processes without unmanageable complexity.
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
This configuration reduces OCV variations and internal resistance, allowing for the shortening of finishing processes and stabilizing the battery state, thereby improving production efficiency.
Implementation Method 1
forming a high-quality coating on the electrodes
Data Source
AI summary
This non-aqueous electrolyte secondary battery comprises: an electrode assembly including a positive electrode, a negative electrode, and a separator; and a non-aqueous electrolyte including a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. The non-aqueous electrolyte contains a fluorine-containing chain carboxylic acid ester represented by formula 1 and a trifluoroethanol. The fluorine-containing chain carboxylic acid ester is contained in an amount of at least 10 vol % with respect to the volume of the non-aqueous electrolyte excluding the electrolyte salt, and the trifluoroethanol is contained in an amount of 0.1-2 mass % with respect to the mass of the fluorine-containing chain carboxylic acid ester. [Formula 1] RCOOCH2CF3, wherein R is a C2 or lower alkyl group, or a fluoroalkyl group.