Secondary Battery Electrolyte Composition for Swelling Suppression
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Solution Overview
Problem
Current secondary batteries face challenges in achieving optimal battery characteristics, such as high energy density, reduced size and weight, and prolonged lifespan, particularly in electronic devices and electric vehicles, due to limitations in electrolytic solution composition leading to decomposition reactions and swelling issues.
Innovation Solution
An electrolytic solution for secondary batteries is developed, comprising ethylene carbonate as a solvent, a specific range of electrolyte salt concentration, and sulfone compounds, optimizing the molar ratio and composition to suppress decomposition reactions and enhance electrode performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytic solution composition is used, then basic battery function is maintained, but decomposition reactions occur and battery lifespan is reduced
Solution Approach 1:
The patent optimizes the molar ratio of ethylene carbonate to electrolyte salt (M2/M1) within a specific range of 0.4 to 2.4, and controls the electrolyte salt content at 0.8 to 2.0 mol/kg. These parameter changes suppress decomposition reactions of the electrolytic solution while maintaining high discharge capacity, thereby extending battery lifespan and reliability.
2Reliability
If electrolyte salt content is increased to improve conductivity, then electrical performance is enhanced, but decomposition reaction increases
Solution Approach 1:
The patent establishes an optimal range for electrolyte salt content (0.8 to 2.0 mol/kg) and controls the molar ratio M2/M1 between 0.4 and 2.4. This balanced parameter optimization ensures sufficient ionic conductivity for high electrical performance while preventing excessive decomposition reactions that would occur at higher concentrations.
3Reliability
If ethylene carbonate content is increased to improve solvation, then electrode performance is enhanced, but gas generation increases
Solution Approach 1:
The patent optimizes the ethylene carbonate content by controlling the molar ratio M2/M1 within 0.4 to 2.4 and electrolyte salt content at 0.8 to 2.0 mol/kg. This balanced composition provides adequate solvation for high electrode performance while suppressing gas generation that would occur with excessive ethylene carbonate.
4Volume of moving object
If battery size is reduced to achieve compact devices, then portability is improved, but energy density requirements increase
Solution Approach 1:
The optimized electrolytic solution composition enables high discharge capacity in a compact form. By controlling the molar ratio M2/M1 and electrolyte salt content, the patent achieves superior energy density per unit volume, allowing smaller battery sizes while maintaining or enhancing total energy storage capacity.
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 optimized electrolytic solution effectively reduces gas generation, prevents battery swelling, and maintains high discharge capacity, leading to improved battery characteristics and extended lifespan in various applications.
Implementation Method 1
the electrolytic solution contains a solvent and an electrolyte salt... a content of the electrolyte salt is from 0.8 mol/kg to 2.0 mol/kg both inclusive
Implementation Method 2
the electrolytic solution contains at least one of sulfone compounds... to suppress a decomposition reaction of an electrolytic solution
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution where (A) the electrolytic solution contains a solvent and an electrolyte salt, the solvent containing ethylene carbonate, (B) a content of the electrolyte salt is from 0.8 mol/kg to 2.0 mol/kg both inclusive, (C) a content of the ethylene carbonate in the solvent is from 10 wt % to 30 wt % both inclusive, (D) a ratio M2/M1 of a number M2 of moles of the ethylene carbonate to a number M1 of moles of the electrolyte salt is from 0.4 to 2.4 both inclusive, and (E) the electrolytic solution contains at least one of sulfone compounds.