13/02/2025
LIBs are mainly composed of electrochemically active , , , , etc. Binders are an important component of LIBs electrodes. Binders can tightly attach active substances and conductive agents to current collectors to form complete electrodes, prevent active substances from falling off and peeling off during charging and discharging, and can evenly disperse active substances and conductive agents, thereby forming a good electron and ion transmission network and realizing efficient transmission of electrons and .
Currently, the substances used as electrode binders include polyvinylidene fluoride ( ), carboxymethyl cellulose ( ), styrene-butadiene rubber ( ), polyvinyl pyrrolidone ( ), polymethyl methacrylate ( ), polyacrylonitrile ( ), polyacrylic acid ( ), polyvinyl alcohol (PVA), sodium alginate (Alg), β-cyclodextrin polymer (β-CDp), polypropylene emulsion ( ), polytetrafluoroethylene ( ), etc., as well as functional derivatives of the above polymers or copolymers between monomers.
In LIBs electrodes, the ideal binder properties should include:
(1) chemical and electrochemical stability in a given electrode/electrolyte system, resistance to electrolyte corrosion, and no redox reaction within the operating voltage;
(2) good solubility, fast dissolution speed in solvent, high solubility, and the required solvent is safe, environmentally friendly, and non-toxic, with water being the best solvent;
(3) moderate viscosity, easy to homogenize and maintain slurry stability, strong adhesion, and the prepared electrode has high peel strength, good mechanical properties, and low binder dosage;
(4) good flexibility, able to withstand bending during electrode operation and volume changes of active material particles during charge and ;
(5) able to form an ideal conductive network with the conductive agent, and the prepared electrode has good conductivity and lithium ion conductivity;
(6) wide source and low cost.