Lithium Battery Electrolyte Additives for Cycle-Life and Thermal Stability
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in achieving improved cycle-life characteristics and thermal stability, which are crucial for high-energy density and safety in portable electronic devices.
Innovation Solution
An electrolyte composition for rechargeable lithium batteries is developed, including a lithium salt, a non-aqueous organic solvent, and specific additives such as compounds with nitrile groups, cyclic sultone derivatives, and aliphatic dinitrile compounds, which form coordination bonds and films on electrodes to enhance stability and cycle-life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional electrolyte compositions are used, then the battery can operate, but the cycle-life characteristic is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte by introducing a specific cyclic carboxylate compound (Formula 1) with controlled molecular structure (L1-L3 groups) and optimal concentration (0.1-5 parts by weight per 100 parts solvent). This parameter change transforms the electrolyte's ability to form stable SEI films, directly improving both cycle-life and stability without sacrificing operational reliability
Solution Approach 2:
The patent creates a composite electrolyte system by combining the cyclic carboxylate compound (Formula 1) with conventional electrolyte components (lithium salt, non-aqueous organic solvent). This composite approach allows the new compound to work synergistically with existing materials, forming a multi-component system that achieves improved cycle-life and stability while maintaining overall battery performance
2Temperature
If conventional electrolyte compositions are used, then the battery can operate, but the thermal stability is insufficient
Solution Approach 1:
The patent changes the thermal properties of the electrolyte by incorporating the cyclic carboxylate compound (Formula 1) with specific structural parameters (L1-L3 groups representing ethylene or propylene chains). This structural modification enables the electrolyte to maintain stability at elevated temperatures, directly addressing thermal stability and high-temperature safety concerns while preserving normal operating conditions
3Duration of action of stationary object
If electrolyte additives are increased to improve cycle-life, then cycle-life improves, but the balance of properties deteriorates
Solution Approach 1:
The patent optimizes the concentration parameter of the cyclic carboxylate compound to a specific range (0.1-5 parts by weight per 100 parts solvent). This precise parameter control ensures that the additive provides sufficient cycle-life improvement without excessive concentration that would disrupt the electrolyte's overall balance, maintaining proper ionic conductivity, viscosity, and electrochemical stability
Solution Approach 2:
The patent employs a small but sufficient amount of the cyclic carboxylate compound (0.1-5 parts per 100 parts solvent) to achieve the desired cycle-life extension. This partial action approach avoids the need for large additive concentrations that would upset the electrolyte's property balance, demonstrating that a modest amount of the right compound is more effective than excessive amounts of various additives
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 composition significantly improves the cycle-life and thermal stability of rechargeable lithium batteries, maintaining a balance of properties and ensuring high temperature safety.
Implementation Method 1
which form coordination bonds and films on electrodes to enhance stability and cycle-life
Implementation Method 2
which form coordination bonds and films on electrodes to enhance stability and cycle-life
Implementation Method 3
A rechargeable lithium battery is fabricated by injecting an electrolyte into a battery cell, which includes a positive electrode including a positive active material capable of intercalating/deintercalating lithium, and a negative electrode including a negative active material capable of intercalating/deintercalating lithium
Data Source
AI summary
An electrolyte for a rechargeable lithium battery including a lithium salt, a non-aqueous organic solvent, and an additive, wherein the additive includes a compound represented by Chemical Formula 1and a rechargeable lithium battery including the same.