Fluorine-Containing Siloxane Electrolyte Additive for Battery Storage Stability
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Solution Overview
Problem
Non-aqueous electrolyte batteries face issues with decreased electric capacitance and increased internal resistance due to the instability of conventional siloxane compounds when reacting with lithium hexafluorophosphate, leading to variations in battery characteristics over time.
Innovation Solution
Incorporating a specific siloxane compound with a fluorine-containing alkoxy group into the electrolyte, which suppresses reactivity with lithium hexafluorophosphate, thereby enhancing storage stability and maintaining superior cycle and internal resistance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional siloxane compounds are added to the electrolyte, then cycle characteristic and internal resistance suppression are improved, but storage stability deteriorates due to reactivity with lithium hexafluorophosphate
Solution Approach 1:
The patent modifies the chemical structure of siloxane compounds by introducing fluorine-containing alkoxy groups (specifically CF3CH2O- or CF3CH(OH)- groups). This parameter change in molecular structure reduces the reactivity of the siloxane with lithium hexafluorophosphate while maintaining the beneficial effects on cycle characteristic and internal resistance suppression. The fluorine-containing groups alter the electronic and steric properties of the siloxane, making it more stable during storage.
2Reliability
If conventional siloxane compounds are added to the electrolyte, then internal resistance increase is suppressed, but battery characteristic variation increases due to instability
Solution Approach 1:
The patent introduces fluorine-containing alkoxy groups into the siloxane structure, which changes the chemical parameters of the additive. This modification stabilizes the electrolyte composition during storage, preventing the decomposition and polymerization issues that lead to battery characteristic variations. The fluorine-containing groups reduce reactivity with lithium hexafluorophosphate, ensuring consistent internal resistance characteristics over time.
3Reliability
If siloxane compound concentration is increased to improve cycle characteristic, then storage stability decreases due to enhanced reactivity
Solution Approach 1:
Instead of increasing the concentration of conventional siloxane compounds, the patent changes the chemical structure by introducing fluorine-containing alkoxy groups. This structural parameter change reduces the reactivity of the siloxane with lithium hexafluorophosphate, allowing for effective cycle characteristic improvement without the harmful side effects of enhanced reactivity and reduced storage stability.
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 use of the fluorine-containing siloxane compound improves the stability and performance of non-aqueous electrolyte batteries by reducing reactivity with lithium hexafluorophosphate, resulting in consistent cycle and internal resistance characteristics even after prolonged storage.
Implementation Method 1
Incorporating a specific siloxane compound with a fluorine-containing alkoxy group into the electrolyte, which suppresses reactivity with lithium hexafluorophosphate
Data Source
AI summary
What is disclosed is a non-aqueous electrolyte for non-aqueous electrolyte battery including a non-aqueous solvent and at least lithium hexafluorophosphate as a solute. This electrolyte is characterized by containing at least one siloxane compound represented by the general formula (1) or the general formula (2). This electrolyte has a storage stability which is improved than electrolytes prepared by adding conventional siloxane compounds.