Polyamideimide Vinyl Polymer Composite Binder for Battery Negative Electrodes
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Solution Overview
Problem
The initial efficiency of electricity storage devices using polyamideimide as a negative electrode binder is lower due to the formation of stack structures that hinder lithium ion migration.
Innovation Solution
A polymer compound is developed by combining a polyamideimide with a vinyl polymer, where the vinyl polymer acts as a random copolymer with bond-constituting and non-bond-constituting units, forming amide or imide bonds to suppress the stack structure formation, thereby improving the initial efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamideimide is used as a negative electrode binder, then adhesion and cyclability are improved, but initial efficiency deteriorates due to stack structure formation
Solution Approach 1:
The patent creates a composite binder system by chemically modifying polyamideimide with vinyl polymer units. The modified polyamideimide contains both the original polyamideimide backbone and grafted vinyl polymer chains, forming a composite material that combines the adhesion benefits of polyamideimide with the stack-structure-suppressing properties of vinyl polymer units.
Solution Approach 2:
The patent introduces local structural variation by incorporating specific vinyl polymer units (such as those with bulky side groups) at specific locations within the polyamideimide chains. These localized modifications prevent stack formation in critical regions while preserving the overall adhesion properties of the polyamideimide binder.
2Strength
If polyamideimide forms stack structures, then adhesion is improved, but lithium ion migration is hindered
Solution Approach 1:
The patent converts the harmful stack structures into beneficial dispersed configurations by introducing vinyl polymer modifications. The modified structure prevents the harmful compact stacking while maintaining the beneficial adhesion properties, effectively transforming the problematic structural tendency into an advantageous dispersed architecture that facilitates lithium ion migration.
Solution Approach 2:
The patent changes the structural parameters of the polyamideimide by chemically grafting vinyl polymer units with specific side chain configurations. This parameter change (introducing bulky side groups) physically prevents the close packing required for stack formation, thereby eliminating the harmful effect while preserving adhesion through the modified polymer architecture.
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 polymer compound enhances the initial efficiency of electricity storage devices by preventing the formation of stack structures, maintaining high cyclability, and improving the adhesion of the negative electrode active material layer.
Implementation Method 1
The polymer compound is made by condensing a polyamideimide and a vinyl polymer
Data Source
AI summary
A polymer compound includes a first chain structure constituted by a polyamideimide and a second chain structure constituted by a vinyl polymer and bonded to terminals of the first chain structures and connecting the first chain structures together. The vinyl polymer constituting the second chain structure is a random copolymer including a bond-constituting unit having a side chain to be bonded to the first chain structure, and a non-bond-constituting unit having no side chain to be bonded to the first chain structure.