In order to improve the performance of polyvinylidene fluoride as a lithium battery binder, what modification methods have been explored?
Publish Time: 2025-03-12
As a widely used binder in lithium batteries, the optimization of the performance of polyvinylidene fluoride is crucial to improving the overall performance of lithium batteries. In order to improve the performance of polyvinylidene fluoride as a lithium battery binder, researchers have explored a variety of modification methods. This article will introduce several major modification methods and explore their effects on the performance of polyvinylidene fluoride.1. Copolymerization modificationCopolymerization modification is an effective method to improve the performance of polyvinylidene fluoride. By copolymerizing VDF monomer with other fluorine-containing or non-fluorine monomers, polyvinylidene fluoride binders with specific functions can be obtained. For example, copolymerizing VDF with fluorine-containing monomers such as hexafluoropropylene and tetrafluoroethylene can improve the flexibility of polyvinylidene fluoride resin, making it more adaptable to the deformation requirements of lithium battery electrode materials. In addition, in order to enhance the adhesion of polyvinylidene fluoride to polar substances and metal electrodes, researchers have also tried to copolymerize polyvinylidene fluoride with monomers containing polar groups such as carboxyl and hydroxyl groups, thereby significantly improving its adhesion.2. Graft modificationGraft modification is another important modification method for polyvinylidene fluoride. This method usually takes polyvinylidene fluoride as the main body and grafts small molecules or inorganic particles onto the polyvinylidene fluoride chain through chemical bonds. This modification method can not only improve the adhesion performance of polyvinylidene fluoride, but also introduce new functional properties. For example, grafting nanomaterials such as graphene onto polyvinylidene fluoride can form a conductive network and improve the charge transfer efficiency and lithium ion diffusion rate of lithium batteries. In addition, graft modification can also improve the wettability of polyvinylidene fluoride with electrolytes, which is beneficial to the transmission of lithium ions.3. Blending modificationBlending modification is to mix polyvinylidene fluoride with other polymer materials to obtain a binder with comprehensive properties. Common polymer materials blended with polyvinylidene fluoride include polyethylene glycol (PEG), polymethyl methacrylate (PMMA) and polyvinyl acetate (PVAc). The addition of these polymer materials can reduce the crystallinity of polyvinylidene fluoride, making it more affinity with electrolyte, thereby increasing the transmission speed of lithium ions. At the same time, blending modification can also improve the mechanical properties and thermal stability of polyvinylidene fluoride, making it more adaptable to the harsh working environment of lithium batteries.4. Inorganic material dopingInorganic material doping is another modification method to improve the performance of polyvinylidene fluoride. By doping inorganic particles such as silica and alumina into polyvinylidene fluoride, the thermal stability and electrochemical properties of polyvinylidene fluoride can be significantly improved. These inorganic particles can not only act as a physical barrier to prevent short circuits in lithium batteries during charging and discharging, but also act as active sites to promote the transmission and storage of lithium ions.In summary, in order to improve the performance of polyvinylidene fluoride as a lithium battery binder, researchers have explored a variety of modification methods. These modification methods can not only improve the bonding, electrochemical and mechanical properties of polyvinylidene fluoride, but also introduce new functional properties, providing strong support for the development of lithium batteries. In the future, with the continuous development of the new energy industry, the performance optimization of polyvinylidene fluoride as a lithium battery binder will continue to be the focus of researchers.
