LiBETA Electrolyte and Separator Materials for Heat-Resistant Li-Ion Cells
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Solution Overview
Problem
Lithium-ion secondary batteries used in electronic devices require high heat resistance to withstand manufacturing temperatures and maintain charging and discharging characteristics without degradation.
Innovation Solution
Incorporation of lithium bis(pentafluoroethanesulfonyl)amide (LiBETA) as a solute in the electrolytic solution, use of high-boiling-point solvents like propylene carbonate, and separators made of polyphenylene sulfide or solvent-spun regenerated cellulosic fiber to enhance heat resistance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes and separators are used in lithium-ion secondary batteries, then the batteries can achieve good charging and discharging characteristics under normal conditions, but the batteries suffer from degradation of charging and discharging characteristics and safety issues when exposed to high temperature heat treatment during electronic device manufacturing
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by using lithium bis(pentafluoroethanesulfonyl)amide (LiBETA) as the solute and propylene carbonate as the solvent, which has high boiling point and thermal stability. The separator material is also changed to polyphenylene sulfide or solvent-spun regenerated cellulosic fiber, which have high heat resistance. These parameter changes enable the battery to maintain its charging and discharging characteristics under heat treatment conditions that would normally degrade conventional batteries.
Solution Approach 2:
The patent employs composite material strategies by combining specific solute and solvent components in the electrolyte to create a thermally stable electrolyte system. The separator uses advanced materials like polyphenylene sulfide or solvent-spun regenerated cellulosic fiber that provide high heat resistance. These composite material choices enable the battery to withstand heat treatment during electronic device manufacturing while maintaining reliable charging and discharging performance.
2Object-affected harmful factors
If the battery is designed to withstand high temperature heat treatment, then heat resistance is improved, but the flexibility and manufacturability of the battery may be compromised
Solution Approach 1:
The patent changes the physical and chemical parameters of the battery components to achieve heat resistance. The electrolyte uses propylene carbonate with high boiling point and LiBETA solute for thermal stability. The separator uses high-heat-resistant materials like polyphenylene sulfide. These parameter changes provide heat resistance while the battery maintains its flexibility for electronic device integration.
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 power storage device maintains charging and discharging characteristics and safety under heat treatment, with improved flexibility and reduced degradation.
Implementation Method 1
The electrolytic solution contains a solute and two or more kinds of solvents. The solute contains lithium bis(pentafluoroethanesulfonyl)amide (LiBETA). One of the solvents is propylene carbonate.
Implementation Method 2
The separator is located between the positive electrode and the negative electrode. The separator contains polyphenylene sulfide or solvent-spun regenerated cellulosic fiber.
Data Source
AI summary
To provide a power storage device whose charge and discharge characteristics are unlikely to be degraded by heat treatment. To provide a power storage device that is highly safe against heat treatment. The power storage device includes a positive electrode, a negative electrode, a separator, an electrolytic solution, and an exterior body. The separator is located between the positive electrode and the negative electrode. The separator contains polyphenylene sulfide or solvent-spun regenerated cellulosic fiber. The electrolytic solution contains a solute and two or more kinds of solvents. The solute contains LiBETA. One of the solvents is propylene carbonate.