Siloxane Electrolyte for Thick Lithium Battery Impregnation
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Solution Overview
Problem
Lithium secondary batteries with thick electrodes face challenges in electrolyte impregnability and lithium ion mobility, leading to deteriorated rate properties and lifetime characteristics due to increased electrical and ionic resistance.
Innovation Solution
Incorporating a siloxane compound, represented by specific formulas, into the electrolyte to reduce surface tension and improve interfacial resistance, enhancing the electrolyte's ability to penetrate thick electrodes and maintain lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a thick electrode is used to increase capacity and energy density, then the capacity and energy density are improved, but the impregnability of electrolyte to the electrode and mobility of lithium ions deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing siloxane compounds with specific molecular structures (Formulae 1 and 2) containing Si-O-Si bonds and specific functional groups. This compositional parameter change improves electrolyte impregnability into thick electrodes and maintains lithium ion mobility, resolving the contradiction between electrode thickness and electrolyte penetration capability
Solution Approach 2:
The patent creates a composite electrolyte system by combining siloxane compounds with traditional electrolyte components (lithium salts and organic solvents). This composite approach leverages the unique properties of siloxane compounds (flexible Si-O-Si backbone, tunable functional groups) to achieve both good impregnability in thick electrodes and high ionic conductivity, simultaneously addressing capacity and reliability requirements
2Quantity of substance
If a thick electrode is used to increase capacity, then the energy density is improved, but the electrical resistance and ionic resistance increase
Solution Approach 1:
The patent modifies the electrolyte's physical and chemical parameters by incorporating siloxane compounds with specific structures (Formulae 1 and 2). These structural parameters (Si-O-Si bond flexibility, functional groups) are optimized to reduce resistance at the electrode-electrolyte interface and within the electrode bulk, thereby reducing energy losses while maintaining high energy density in thick electrodes
Solution Approach 2:
The siloxane compound acts as an intermediary substance between the thick electrode and the traditional electrolyte components. It facilitates improved wetting and contact at the interface, and provides a low-resistance pathway for lithium ion transport through the thick electrode structure, reducing both electrical and ionic resistance while preserving high energy density
3Quantity of substance
If a thick electrode is used to improve capacity, then the specific energy is increased, but the rate properties deteriorate
Solution Approach 1:
The patent changes the electrolyte composition parameters by adding siloxane compounds with specific molecular structures (Formulae 1 and 2). These structural changes enhance the electrolyte's ability to penetrate and maintain ionic conductivity throughout thick electrodes, enabling fast lithium ion transport rates while preserving high specific energy in the thick electrode configuration
Solution Approach 2:
The patent optimizes the concentration ratio of siloxane compounds to traditional electrolyte components to achieve the best balance between ionic conductivity and viscosity. This parameter optimization ensures rapid lithium ion mobility throughout the thick electrode during charge-discharge cycles, improving rate properties while maintaining high specific energy
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 siloxane compound improves the battery's impregnability and mobility of lithium ions, suppressing gas generation from side reactions and enhancing the battery's lifetime characteristics and rate properties.
Implementation Method 1
Incorporating a siloxane compound, represented by specific formulas, into the electrolyte to reduce surface tension and improve interfacial resistance
Implementation Method 2
maintain lithium ion conductivity
Data Source
AI summary
An electrolyte and a lithium secondary battery including the same. The electrolyte includes a lithium salt; an organic solvent; and at least one siloxane compound represented by Formula 1 or Formula 2, wherein an amount of the at least one siloxane compound is about 0.05 wt % to about 20 wt % based on a total weight of the electrolyte.In Formulae 1 and 2, group substituents and number indices are as defined in the specification.