Method for preparing lithium battery electrode by using supercritical current collector and electrode

Abstract

The invention relates to a method for preparing a lithium battery electrode by using a supercritical current collector and the electrode. The method comprises the following steps: putting an electrodematerial, a conductive agent and an adhesive into a high-pressure reaction kettle according to a required ratio; adding a supercritical CO2 fluid into a high-pressure reaction kettle, stirring the mixture for 1-20 hours in a high-temperature and high-pressure closed environment at 100-150 DEG C for 1-20 MPa, and forming a uniformly distributed electrode system by the electrode material, the conductive agent and the adhesive under the action of the supercritical CO2 fluid; after stirring is completed, relieving the pressure, wherein in the pressure relief process, the supercritical CO2 fluid is converted into gaseous CO2 to be discharged out of the high-pressure reaction kettle; and after pressure relief is completed, drying and hot-pressing a product in the high-pressure reaction kettle to obtain the lithium battery electrode.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a method for preparing lithium battery electrodes by using a supercritical current collector and the electrodes. Background technique [0002] With the rapid development of modern social economy and technology, the performance of traditional lithium-ion batteries can no longer meet the current energy demand. The rapid development of electric vehicles, intelligent consumer electronics and other fields are in urgent need of lithium-ion batteries with higher energy density, long cycle life, low cost, and high safety. [0003] At present, in terms of positive and negative electrodes, while the requirements for material capacity are getting higher and higher, higher requirements are also put forward for the stability and consistency of the positive and negative electrodes. At present, the R&D focus of domestic enterprises and research institutes is mainly on the development of NCM8...

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Problems solved by technology

[0005] However, during the electrode preparation process containing solvents, the process parameters (temperature, air flow, pressure, and thermal radiation, etc.) significantly affect the microstructure of the final electrode, and changes in drying process parameters such as high temperature will lead to an increase in the drying rate, and the binder evaporates near the Accumulated on the surface, depleted near the current collector

Uneven distribution of the binder will result in a decrease in the adhesion between the electrode and the current collector, an increase in resistance, and a decrease in capacity

[0006] In addition to the influence of solvent volatilization on electrochemical performance, in the preparation of positive and negative electrodes, the solvents used are usually toxic solvents containing organic solvents, which are easy to cause environmental pollution and damage while the manufacturing cost is high

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