Positive Electrode Slurry Polymer for Adhesion and Particle Dispersion
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Solution Overview
Problem
Current electrode plates in secondary batteries exhibit poor electrochemical performance due to homogeneous film layers, leading to agglomeration of active material particles and increased internal resistance.
Innovation Solution
A polymer with specific structural units, including vinylidene fluoride and carboxyl groups, is used as a dispersant and auxiliary binder, improving dispersion and adhesion, thereby reducing agglomeration and enhancing the structural stability of the electrode plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional binders with high adhesion are used, then adhesion between particles and current collectors is improved, but dispersion performance deteriorates and particles agglomerate
Solution Approach 1:
The patent changes the chemical parameters of the binder by introducing carboxyl groups (-COOH) at specific positions in the polymer chain. This chemical modification enables the binder to provide both adhesion and dispersion functions simultaneously, resolving the contradiction between adhesion strength and dispersion uniformity.
Solution Approach 2:
The patent creates a composite binder structure combining hydrophobic segments (for adhesion to active materials and current collectors) and hydrophilic segments with carboxyl groups (for dispersion and deagglomeration). This composite structure allows the single binder to perform multiple functions that previously required separate materials.
2Ease of manufacture
If homogeneous film layers are used in electrode plates, then manufacturing simplicity is maintained, but electrochemical performance deteriorates due to particle agglomeration
Solution Approach 1:
The patent introduces local heterogeneity into the film layer through the use of graft copolymer binder with distributed carboxyl groups. These functional groups are locally concentrated around particles to prevent agglomeration, while maintaining overall film homogeneity for ease of manufacture. This local quality enhancement improves electrochemical performance without complicating the manufacturing process.
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 ensures even distribution of active materials, reduces internal resistance, and improves the electrochemical performance of secondary batteries by maintaining structural integrity and mechanical toughness.
Implementation Method 1
the polymer exhibits improved dispersion performance and still has certain adhesion. When the polymer is applied in secondary batteries, especially in the preparation of a conductive slurry, it can act as a dispersant
Implementation Method 2
the adhesion between particles and the adhesion between particles and current collectors can be improved, thereby ensuring the structural stability of the electrode plate
Data Source
AI summary
A polymer, a conductive slurry, a positive electrode plate, a secondary battery, and an electric apparatus. The polymer includes a structural unit represented by formula (1) and structural unit(s) represented by formula (2), where in formula (2), R1, R2, and R3 are each independently selected from a hydrogen atom, a halogen atom, or a substituted or unsubstituted C1-C10 alkyl group. The polymer in embodiments of this application exhibits improved dispersion performance.