Li-Ion Battery Electrolyte Composition to Suppress High-Temperature Swelling
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Solution Overview
Problem
Lithium-ion secondary batteries face challenges in achieving superior battery characteristics, particularly in high-temperature environments, due to decomposition reactions and swelling issues related to the electrolytic solution, which affect their performance and reliability.
Innovation Solution
The use of an electrolytic solution comprising a solvent, an electrolyte salt, and specific dioxane compounds, such as those represented by Formulas (1) and (2), which form a protective film on the negative electrode, reducing decomposition reactions and gas generation, thereby suppressing battery swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluorinated cyclic compound such as 2,2-bis(trifluoromethyl)-1,3-dioxane is included in the electrolytic solution to obtain excellent charge and discharge efficiency even at high temperatures, then charge and discharge efficiency is improved, but decomposition reactions occur and gas generation increases leading to battery swelling
Solution Approach 1:
The patent modifies the chemical structure of dioxane compounds by replacing fluorine atoms with hydrogen atoms at specific positions (creating compounds of formulas (1) and (2) where R1-R16 are hydrogen or monovalent hydrocarbon groups). This structural parameter change maintains the beneficial film-forming properties and charge-discharge efficiency while eliminating the decomposition and gas generation issues associated with fluorinated compounds.
Solution Approach 2:
The electrolytic solution uses a composite approach by combining specific non-aqueous solvents (cyclic carbonates, chain carbonates, γ-butyrolactone) with the novel hydrogenated dioxane compounds (formulas (1) and (2)). This composite electrolytic solution configuration achieves both high charge-discharge efficiency and suppression of decomposition reactions through synergistic effects of the different components.
2Quantity of substance
If conventional electrolytic solution configuration is used to achieve high energy density, then battery capacity increases, but swelling occurs in severe environments like high temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolytic solution by introducing specific dioxane compounds with defined molecular structures (formulas (1) and (2)) where R1-R16 are hydrogen or monovalent hydrocarbon groups. This compositional parameter change enables the formation of stable protective films that prevent swelling while maintaining high battery capacity even in severe environments.
Solution Approach 2:
The dioxane compounds act as intermediary substances that form protective films on the electrode surfaces. These films serve as mediators between the electrolytic solution and electrodes, preventing direct harmful interactions that cause swelling while allowing efficient ion transport for high capacity operation.
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 proposed electrolytic solution effectively reduces decomposition reactions and gas generation, leading to improved chemical stability and reduced swelling of lithium-ion secondary batteries, even in severe environments like high temperatures, thus enhancing battery characteristics.
Implementation Method 1
the electrolytic solution includes the first dioxane compound, the second dioxane compound, or both. Accordingly, it is possible to achieve a superior battery characteristic
Data Source
AI summary
A lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes a solvent, an electrolyte salt, and at least one of a first dioxane compound or a second dioxane compound.