Polymer Electrolyte Composition for Lithium Battery High Temperature Stability
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Solution Overview
Problem
Rechargeable lithium batteries face challenges with high temperature storage characteristics and cycle-life characteristics due to the reactivity of organic solvents with negative electrodes, leading to reduced cell stability and performance.
Innovation Solution
A polymer electrolyte composition comprising an acrylate-based polymer, a lactone-based compound with an alkyl substituent, a non-aqueous organic solvent, and a lithium salt, which forms a stable solid electrolyte interface film on electrodes, enhancing high temperature storage and cycle-life characteristics without deteriorating cell performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If organic solvents are used in the electrolyte, then lithium ion mobility is improved, but cell stability deteriorates due to reactivity with negative electrode
Solution Approach 1:
The patent introduces a polymer electrolyte composition as an intermediary substance between the organic solvent and the negative electrode. This polymer electrolyte forms a stable interface layer that allows lithium ion transport while preventing direct contact and harmful reactions between the organic solvent and the negative electrode, thus maintaining both ion mobility and cell stability
Solution Approach 2:
The patent creates a composite electrolyte system combining polymer materials with lithium salts to form a polymer electrolyte composition. This composite structure integrates the benefits of polymer stability with the ionic conductivity of lithium salts, providing a stable yet ion-conductive interface that resolves the contradiction between reactivity and ion mobility
2Use of energy by moving object
If organic solvents are used in the electrolyte, then ionic conductivity is improved, but gas generation increases during charge and discharge
Solution Approach 1:
The polymer electrolyte composition acts as a mediator between the ionic conduction function and the gas generation problem. It provides a stable interface that enables efficient lithium ion transport while preventing the decomposition reactions that produce gas, thus achieving high ionic conductivity without harmful gas generation
3Reliability
If polymer electrolyte composition is used, then high temperature storage characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the compositional parameters of the polymer electrolyte, specifically controlling the content of the lactone-based compound within 1-10 wt% and the acrylate-based polymer within 0.01-2 wt%. By adjusting these parameters within specific ranges, the patent achieves improved high temperature storage characteristics while maintaining manufacturability through standardized composition control
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 polymer electrolyte composition improves high temperature storage and cycle-life characteristics of lithium batteries, maintaining cell performance and safety by forming a stable film on electrodes, with the acrylate-based polymer and lactone-based compound optimizing lithium ion mobility and reducing reactivity issues.
Implementation Method 1
forms a stable solid electrolyte interface film on electrodes
Implementation Method 2
optimizing lithium ion mobility
Data Source
AI summary
A polymer electrolyte composition for a rechargeable lithium battery includes an acrylate-based polymer, a lactone-based compound having an alkyl substituent, a non-aqueous organic solvent, and a lithium salt. The electrolyte for a rechargeable lithium battery of the present invention exhibits excellent high temperature storage characteristics, excellent high temperature cycle-life characteristics, and improved safety without deteriorating cell performance.