Conductive Primer Adhesive for Dry Electrode Current Collector Bonding
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Solution Overview
Problem
The dry electrode preparation method for lithium-ion batteries faces challenges in achieving a strong adhesive force between the dry electrode film layer and the current collector, leading to potential detachment and reduced safety and service life of the battery.
Innovation Solution
A primer adhesive comprising a modified polyolefin resin copolymerized with maleic anhydride and petroleum resin, combined with conductive materials like graphene, is applied to enhance the adhesive force and reduce volume resistivity, improving the interfacial contact and electron transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dry electrode preparation method is used, then the capacity and cycling life of the battery are improved, but the adhesive force between the dry electrode film layer and the current collector is insufficient
Solution Approach 1:
The patent introduces a primer adhesive layer as an intermediary substance between the dry electrode film layer and the current collector. This primer adhesive, comprising modified polyolefin resin and conductive material, mediates the interface interaction, providing both adhesive bonding and conductive pathways, thereby resolving the contradiction between achieving strong adhesion and maintaining electrical conductivity in dry electrode preparation
Solution Approach 2:
The patent employs composite materials by combining modified polyolefin resin (providing adhesion) with conductive materials such as carbon black, graphene, or carbon nanotubes (providing conductivity). This composite primer adhesive layer simultaneously addresses both the adhesive force requirement and the electrical conductivity requirement, resolving the technical contradiction
2Ease of manufacture
If a wet coating process is used, then the electrode plate can be prepared easily, but the baking time is long and solvent recovery is required, increasing production cost and process complexity
Solution Approach 1:
The patent extracts and eliminates the organic solvent component from the traditional wet coating process, adopting a dry electrode preparation method. By removing the solvent, the process avoids the need for lengthy baking and solvent recovery operations, significantly reducing production time and complexity while maintaining ease of manufacture through the introduced primer adhesive system
Solution Approach 2:
The patent uses a disposable primer adhesive layer that is applied in a dry state and does not require solvent evaporation or extensive thermal processing. This approach replaces the expensive and time-consuming solvent recovery infrastructure with a simpler, more efficient dry application method
3Ease of manufacture
If the current collector surface is smooth, then the manufacturing process is simple, but it is difficult to ensure close attachment of the dry electrode film layer
Solution Approach 1:
The primer adhesive layer serves as an intermediary that compensates for the smooth surface of the current collector. Rather than modifying the current collector surface (which would increase manufacturing complexity), the primer adhesive provides the necessary roughness and adhesion properties, maintaining simple current collector processing while achieving high attachment quality
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 primer adhesive significantly improves the adhesive force between the dry electrode film layer and the current collector, even when soaked in electrolyte, preventing film detachment and enhancing the battery's service life and safety performance.
Implementation Method 1
a primer adhesive comprising a modified polyolefin resin copolymerized with maleic anhydride and petroleum resin
Implementation Method 2
copolymer formed by the polymerization of maleic anhydride, polyolefin and a petroleum resin
Implementation Method 3
combined with conductive materials like graphene, is applied to enhance the adhesive force and reduce volume resistivity, improving the interfacial contact and electron transport
Data Source
AI summary
A primer adhesive for a dry electrode includes following components in parts by mass: 30-70 parts of a modified polyolefin resin and 10-60 parts of a conductive material, where the modified polyolefin resin is a copolymer formed by polymerization of maleic anhydride, polyolefin, and a petroleum resin.