Polyimide Composite Binder for Stronger Lithium-Ion Electrode Cycling
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Solution Overview
Problem
The existing binders for lithium-ion battery electrodes lack sufficient mechanical properties and fail to effectively improve charge and discharge cycle characteristics.
Innovation Solution
A binder composed of a polymer composite formed by combining a polyimide precursor with a cyclic molecule having multiple ether bonds, specifically cyclodextrin, crown ether, or thiocrown ether, enhances mechanical properties and improves charge and discharge cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional polyimide binder is used for lithium-ion battery electrodes, then the binder provides basic binding function, but the mechanical properties are insufficient and charge-discharge cycle characteristics are not improved
Solution Approach 1:
The invention uses a composite binder system comprising polyimide, polyamic acid, and cyclic carbonate. This composite material approach combines the binding properties of polyimide with the mechanical flexibility and cycle stability of polyamic acid and cyclic carbonate, resolving the contradiction between mechanical properties and charge-discharge cycle characteristics
Solution Approach 2:
The invention changes the chemical composition parameters of the binder by incorporating specific ratios of polyimide (1-50 wt%), polyamic acid (5-90 wt%), and cyclic carbonate (5-90 wt%). This parameter optimization enables simultaneous improvement of mechanical properties and electrochemical cycle stability
2Ease of manufacture
If the binder composition is simplified for ease of manufacture, then production becomes easier, but mechanical properties and performance enhancement are insufficient
Solution Approach 1:
The invention optimizes the weight percentage parameters of each component (polyimide: 1-50%, polyamic acid: 5-90%, cyclic carbonate: 5-90%) to achieve the desired breaking energy while maintaining ease of manufacture through straightforward mixing and coating processes
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 composite binder exhibits excellent mechanical properties and improves the charge and discharge cycle characteristics of energy storage devices, demonstrating high breaking energy and flexibility.
Implementation Method 1
a binder containing a polymer composite formed by compositing a polyimide precursor with a cyclic molecule having a plurality of ether bonds
Implementation Method 2
the polyimide being obtained by imidizing a part or all of the polyimide precursor
Data Source
AI summary
A binder for an energy storage device including a polymer composite formed by compositing a polyimide precursor and/or a polyimide with a cyclic molecule having multiple ether bonds. The polyimide precursor contains a reactant of a tetracarboxylic acid component and a diamine component. The polyimide is obtained by imidizing a part or all of the polyimide precursor.