COPOLYMERIZED PVDF RESIN FOR LITHIUM BATTERY BINDER AND PREPARATION METHOD THEREFOR

• Main Authors: MA, Congli, WANG, Jinming, SU, Lanhui, WU, Zhigang, ZHAO, Xinben, HAN, Jinming, WANG, Zhengliang, WU, Yupeng
• Format: Patent
• Language: English; French; German
• Published: 05.07.2023
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

A copolymerized PVDF resin for a lithium battery binder and a preparation method therefor. The preparation method comprises the following steps: reacting 300-600 parts of deionized water,0.04-0.25 part of a pH buffer regulator, 85-99.5 parts of a vinylidene fluoride (VDF) monomer, 0.5-15 parts of a comonomer, 0.3-3 parts of a metallocene synergist, 0.2-1.0 part of an initiator and 0.08-0.35 part of a dispersant at 40-65# under 5.5-8.0 Mpa; recovering unreacted monomers after the reaction is finished; and washing, filtering and drying same, so as to obtain the copolymerized PVDF resin. The copolymerized PVDF resin for a lithium battery binder improves the binding performance of the PVDF resin to a positive electrode active substance and a current collector, reduces the rotational viscosity of an NMP solution, and reduces the requirements for the formulation and dispersion of a PVDF resin slurry.