Lithium Battery Electrolyte Additive for Thermal Stability
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Solution Overview
Problem
Rechargeable lithium batteries face challenges with high temperature cycle-life degradation and gas generation due to additives decomposing during charge and discharge, which can lead to overcharge issues and safety concerns in high-capacity, high-voltage batteries.
Innovation Solution
An electrolyte composition including a lithium salt, non-aqueous organic solvent, and a specific additive represented by Chemical Formula 1, which is polymerized to form a radical reaction, acting as a safety protection device by cutting off voltage and current when the battery temperature exceeds a certain level, preventing overcharge and degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If additives are used in the electrolyte to improve battery performance, then battery capacity and voltage can be enhanced, but the additives decompose during charge and discharge causing high temperature cycle-life degradation and gas generation
Solution Approach 1:
The patent introduces a novel additive with specific molecular structure parameters (represented by Chemical Formula 1 with R1-R6 being specific hydrocarbon groups) and controls its concentration parameter within 0.1-5.0 wt% to achieve improved power while maintaining reliability. This parameter optimization prevents decomposition issues that plague conventional additives.
Solution Approach 2:
The electrolyte uses a composite formulation combining the new additive (Chemical Formula 1) with conventional electrolyte components (lithium salt and organic solvent). This composite approach leverages the benefits of the novel additive while maintaining the stability of proven components, resolving the contradiction between power enhancement and reliability.
2Ease of operation
If conventional additives are used in the electrolyte, then battery operation is maintained, but gas generation occurs due to additive decomposition during charge and discharge
Solution Approach 1:
The patent changes the chemical structure parameters of the additive (Chemical Formula 1 with specific R1-R6 hydrocarbon groups) to a configuration that prevents decomposition during operation. The controlled concentration parameter (0.1-5.0 wt%) further ensures stable operation without gas generation, eliminating the harmful effect while maintaining ease of operation.
3Power
If the battery operates at high temperature, then power output can be maintained, but cycle-life degradation accelerates due to additive decomposition
Solution Approach 1:
The patent optimizes the molecular structure parameters of the additive (Chemical Formula 1) with specific hydrocarbon substituents R1-R6 that provide thermal stability. This structural parameter change allows the battery to maintain power output at elevated temperatures without suffering from accelerated cycle-life degradation caused by additive decomposition.
Solution Approach 2:
The electrolyte composite combines the thermally stable additive (Chemical Formula 1) with conventional electrolyte components, creating a formulation that maintains power output characteristics while providing enhanced thermal stability and preventing cycle-life degradation at high temperatures.
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 effectively inhibits overcharge, prevents high temperature cycle-life degradation, and avoids gas generation, ensuring safer operation of rechargeable lithium batteries by utilizing the additive's role in activating a safety protection mechanism.
Implementation Method 1
which is polymerized to form a radical reaction
Implementation Method 2
Batteries transform chemical energy (generated from an electrochemical redox reaction of a chemical material thereinside) into electrical energy
Data Source
AI summary
An electrolyte for a rechargeable lithium battery and a rechargeable lithium battery, the electrolyte including a lithium salt, a non-aqueous organic solvent, and an additive represented by the following Chemical Formula 1:wherein, in Chemical Formula 1, R1 to R3 are each independently a substituted or unsubstituted C1 to C10 alkylene group, a substituted or unsubstituted C3 to C30 cycloalkylene group, a substituted or unsubstituted C6 to C30 arylene group, or a substituted or unsubstituted C2 to C30 heteroarylene group.