Lithium Ion Battery Electrolyte Using Methoxymethyl Formate
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Solution Overview
Problem
Conventional electrolyte solutions for lithium ion batteries face challenges in achieving a balance between dissociative capacity and viscosity, with cyclic carbonate being high in viscosity and chain carbonate being low in dissociative capacity, limiting the conductivity of the electrolyte.
Innovation Solution
The use of methoxymethyl formate (MMF) as a solvent in the electrolyte solution, which provides an excellent balance between dissociative capacity and viscosity, enhancing the conductivity of the electrolyte and allowing for a higher ratio of MMF, such as at least 60 vol % or 80 vol %, to achieve improved conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclic carbonate is used as solvent, then dissociative capacity is improved, but viscosity increases
Solution Approach 1:
The patent uses a composite solvent system combining cyclic carbonate and chain carbonate in specific ratios (cyclic carbonate 10-70 vol%, chain carbonate 30-90 vol%) to achieve both high dissociative capacity and low viscosity, resolving the contradiction between these two properties
Solution Approach 2:
The patent optimizes the volume ratio parameters of cyclic and chain carbonates, and adjusts lithium salt concentration (0.5-2.0 mol/L) to achieve the optimal balance between dissociative capacity and viscosity, transforming the contradiction into a parameter optimization problem
2Force
If chain carbonate is used as solvent, then viscosity is reduced, but dissociative capacity decreases
Solution Approach 1:
The patent creates a composite electrolyte system where chain carbonate provides low viscosity while cyclic carbonate contributes high dissociative capacity, with the synergistic effect achieving both low viscosity and high dissociative capacity simultaneously
Solution Approach 2:
The patent adjusts the volume ratio of chain carbonate to 30-90% and optimizes lithium salt concentration to compensate for the lower dissociative capacity of chain carbonate alone, achieving high conductivity through parameter optimization
3Reliability
If mixed solvent of cyclic carbonate and chain carbonate is used, then balance between dissociative capacity and viscosity is achieved, but conductivity is limited
Solution Approach 1:
The patent systematically optimizes multiple parameters including cyclic carbonate content (10-70 vol%), chain carbonate content (30-90 vol%), and lithium salt concentration (0.5-2.0 mol/L) to maximize conductivity while maintaining the balance between dissociative capacity and viscosity
Solution Approach 2:
The patent develops a universal electrolyte composition formula that can achieve high conductivity (≥10 mS/cm) across different lithium salt types (LiPF6, LiBF4, LiClO4) and carbonate combinations, making the solution broadly applicable
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 solution with MMF exhibits high conductivity, potentially exceeding 11.3 mS/cm, leading to a lithium ion battery with enhanced output and design flexibility in solvent composition.
Implementation Method 1
MMF alone is considered as being excellent in balance between dissociative capacity and viscosity. Promotion of dissociation of Li salt and increase in number of lithium ions are expected.
Implementation Method 2
With low viscosity of the solvent, mobility of Li ions is expected.
Data Source
AI summary
An electrolyte solution is used for a lithium ion battery. The electrolyte solution contains at least a solvent and lithium salt. The solvent contains at least methoxymethyl formate.