High-energy-density battery electrode and low-carbon preparation method and application thereof

Abstract

The invention relates to a battery electrode and a low-carbon low-energy-consumption preparation method and application thereof, which belong to the field of batteries. The invention provides a preparation method of a battery electrode, which comprises the following steps of uniformly mixing a positive electrode or negative electrode active material, a conductive filler and a polymer solution to prepare functional electrode slurry, and coating the functional electrode slurry on the surface of a current collector to obtain a positive electrode or a negative electrode. The polymer solution comprises multi-component polymer adhesive molecules and a solvent, the polymer comprises polyvinylidene fluoride and a second component, and the solvent is a low-boiling-point poor solvent of polyvinylidene fluoride; and the second component is a macromolecular substance which can be mutually attracted with the polyvinylidene fluoride so as to expand the molecular chain conformation of the polyvinylidene fluoride. According to the composite electrode prepared by the method, the active material, the conductive agent and the polymer are more uniformly distributed in the whole composite material after being dried; and uniform regulation and control of ion and electron transport networks around the active particles are realized.

Description

technical field [0001] The invention relates to a high-energy-density power battery electrode and a low-carbon preparation method and application thereof, belonging to the field of batteries. Background technique [0002] The secondary ion battery is an energy storage technology that has attracted much attention in the industry and academic fields. In terms of performance, high energy density, high power density, and long cycle life are the focus of research. In the process of processing, the difficulty of processing The degree of ease, the energy consumption required in the processing process, the price and toxicity of processing raw materials are all key factors that need to be regulated. The research and development of advanced active materials must be the key to high-performance energy storage equipment, but how to fully exert and guarantee its functions is inseparable from the overall structural design of the electrode, the control of the microscopic morphology, the con...

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Problems solved by technology

[0006] In view of the defects of the traditional binder system and the great demand for low-carbon and low-energy processing of high-performance electrodes, the present invention still uses PVDF binder as the base material, and utilizes its low boiling point poor solvent (such as N,N-dimethylformaldehyde) for the first time. Dimethyl formamide, DMF) to replace the traditional high-boiling point good solvent (such as N-methylpyrrolidone NMP), combined with a suitable second component to expand and regulate the conformation of the PVDF molecular chain in the poor solvent DMF, not only solved the problem of PVDF -The problem that the DMF system cannot be used to prepare the electrode slurry, and at the same time, it has obtained better overall performance of the binder than the traditional PVDF-NMP system: including more uniform dispersion and distribution of the conductive agent in the dry electrode, stronger concentration Fluid interface adhesion and better electrode bending resistance

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