Lithium-Ion Battery Additive for Thick Electrode Dispersion
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Solution Overview
Problem
Thick electrodes in lithium ion batteries suffer from poor mechanical properties and difficulty in dispersing nanosized cathode particles.
Innovation Solution
An additive comprising specific polymers, small molecule amines, and stabilizers is used to improve the dispersibility of conductive agents, reduce viscosity, and enhance mechanical properties by promoting cathode particle dispersion and coating uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If thick electrodes are used to improve energy density, then energy density is improved, but mechanical properties deteriorate and cracking occurs
Solution Approach 1:
The patent introduces a specific additive composition as an intermediary substance between the electrode materials and binder. This additive contains polymers with functional groups that simultaneously interact with both the cathode particles and the binder, creating a bridging effect that strengthens the overall electrode structure while maintaining the thick electrode configuration for high energy density
Solution Approach 2:
The patent employs a composite additive system combining multiple polymers (ethyl cellulose, polyvinyl butyral, styrene-acrylonitrile-acrylic acid copolymer) with specific functional groups. This composite approach creates a multi-functional material that provides both mechanical reinforcement and improved adhesion, allowing thick electrodes to maintain structural integrity while achieving high energy density
2Quantity of substance
If nanosized cathode particles are used, then capacity is improved, but dispersion difficulty increases
Solution Approach 1:
The additive acts as a mediator between nanosized cathode particles and the binder matrix. The polymer chains with functional groups adsorb onto the nanoparticle surfaces while extending into the binder phase, effectively bridging the interface and preventing nanoparticle aggregation, thus achieving uniform dispersion of high-capacity nanomaterials
Solution Approach 2:
The patent modifies the chemical parameters of the binder system by incorporating polymers with specific functional groups (carboxyl, hydroxyl, ether oxygen) that change the surface chemistry and interfacial properties. This parameter change enables better wetting and dispersion of nanosized particles, transforming the manufacturing process from difficult to feasible
3Device complexity
If conventional binders are used, then simplicity is maintained, but dispersibility of conductive agents deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the binder by selecting polymers with specific functional groups (carboxyl, hydroxyl, ether oxygen) that provide enhanced interaction with conductive agents. This parameter change improves the dispersibility and distribution of conductive agents throughout the electrode without significantly complicating the overall binder system
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 additive enhances the mechanical stability of thick electrodes, improves cathode particle dispersion, and reduces slurry viscosity, leading to better coating uniformity and reduced resistivity.
Implementation Method 1
Small molecule organic amine 10-20; Stabilizer 10-20; The stabilizer is a hydrazine compound
Implementation Method 2
The additive can effectively promote the dispersion of the cathode particles
Implementation Method 3
First polymer 1-10; Second polymer 5-15; The first polymer is at least one of the following: ethyl cellulose, polyvinyl alcohol, polyvinyl butyral, ethylene-vinyl alcohol copolymer, and methyl vinyl ether-maleic anhydride linear copolymer; The second polymer is at least one of the following: polyvinylpyrrolidone, hydrogenated nitrile rubber, polyacrylonitrile, polypyrrole, and styrene-acrylonitrile-acrylic acid copolymer
Implementation Method 4
the viscosity and solid content of the slurry
Implementation Method 5
The additive for lithium ion batteries provided by this disclosure can be used as a dispersant for conductive agents in lithium ion batteries, which can significantly improve the dispersibility of the conductive agent, reduce the viscosity and fineness of the conductive agent slurry, and lower the resistivity of the electrode sheet
Data Source
AI summary
Disclosed are an additive for a lithium-ion battery and use thereof. The raw materials of the additive for a lithium ion battery have the following parts by weight: 40-70 parts of first solvent; 1-10 parts of first polymer; 5-15 parts of second polymer; 10-20 parts of small molecule organic amine; and 10-20 parts of stabilizer. The first polymer contains at least one nitrogen-free polar functional group; the second polymer contains at least one nitrogen-containing polar functional group; and the stabilizer is a hydrazine compound. The additive provided in the present disclosure is used in lithium-ion batteries to solve the problem of easy cracking of thick electrodes and difficult dispersion of cathode particles.