Lithium-Ion Battery Electrolyte Composition for Low Resistance Storage
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Solution Overview
Problem
Lithium ion secondary batteries face challenges in achieving low resistance and improved storage characteristics, particularly after high-temperature storage, which affects their performance and efficiency.
Innovation Solution
An electrolyte solution containing a compound represented by specific formulas, including an imidazolium cation and difluorophosphoric acid ion, is used, with a preferred molar ratio and concentration range to enhance the battery's resistance and storage capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then the battery can operate, but the resistance is high and storage characteristics deteriorate after high-temperature storage
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the electrolyte solution. Specifically, it introduces compound (1) with specific R1 and R2 groups (methyl, ethyl, propyl, or butyl) and controls the molar ratio of compound (1) to LiPF6 between 1/100 and 1/10, thereby optimizing the electrolyte's resistance and storage characteristics without changing the fundamental electrolyte system
Solution Approach 2:
The patent employs composite materials by combining compound (1) (an imidazolium salt with specific alkyl groups) with LiPF6 (lithium hexafluorophosphate) in a controlled molar ratio. This composite electrolyte system leverages the complementary properties of both compounds to achieve low resistance and improved storage characteristics that neither component could achieve alone
2Duration of action of stationary object
If the battery is stored at high temperature, then storage testing is completed, but capacity recovery is poor and performance degrades
Solution Approach 1:
The patent applies preliminary action by incorporating compound (1) into the electrolyte solution before battery assembly and storage. This compound pre-establishes a protective chemical environment that prevents degradation during high-temperature storage, enabling excellent capacity recovery (95% or more) after storage without requiring post-storage treatment or intervention
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 significantly reduces resistance and improves storage characteristics, including capacity recovery after high-temperature storage, thereby enhancing the overall performance of lithium ion secondary batteries.
Implementation Method 1
an electrolyte solution for a lithium ion secondary battery, including a compound (1) represented by the following formula (1)
Data Source
AI summary
An electrolyte solution for a lithium ion secondary battery, including a compound (1) represented by the following formula (1):wherein R1 and R2 are each independently a methyl, ethyl, propyl, or butyl group. Also disclosed is a lithium ion secondary battery including the electrolyte solution and a module including the lithium ion secondary battery.