Preparation method of thick electrode with excellent electrochemical performance and lithium ion battery

Abstract

The invention discloses a thick electrode with excellent electrochemical performance. An electrode thickness of the thick electrode is larger than 300mu m. The thick electrode comprises an anode thick electrode body and a cathode thick electrode body, wherein the anode thick electrode body comprises an anode current collector, an anode active material, an anode binder, a porous carbon conductive agent and a fluorocarbon surfactant; the cathode thick electrode body comprises a cathode current collector, a cathode active material, a cathode binder, a porous carbon conductive agent and a thickener; the porous carbon conductive agent has rich porous channels, can obviously absorb and keep electrolyte and solves the problems that thick electrode electrolyte has poor wettability, active material utilization is insufficient, and the like; the fluorocarbon surfactant can reduce surface tension of anode slurry, improve a coating effect of the slurry on the current collectors and meanwhile improve absorbing and keeping ability of an anode piece to the electrolyte. By means of the technical characteristics, the anode thick electrode body and the cathode thick electrode body with excellent conducting performance can be prepared out, so that a high energy density lithium ion battery with excellent electrochemical performance can be obtained.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for preparing a positive electrode thick electrode and a negative electrode thick electrode with excellent electrochemical properties, and a high energy density lithium ion battery assembled from the prepared thick electrodes. Background technique [0002] With the continuous development of science and technology, the application field of lithium-ion batteries has expanded from portable electronic products to electric vehicles, energy storage power supplies, aviation fields, etc. Especially for large electric equipment such as electric vehicles, under the premise of ensuring safety, they need to have a certain mileage and a cycle life matching that of electric vehicles. Therefore, higher requirements are put forward for the energy density, cycle life and rate performance of lithium-ion batteries. Require. There are many ways to increase the energy densit...

AI Technical Summary

Problems solved by technology

However, in the actual manufacture and application of thick electrodes, there are also certain technical difficulties. As the thickness of the electrode sheet increases, it is easy to cause problems such as poor electrolyte infiltration and uneven conduction inside the electrode sheet, which leads to long-term cycle performance of the battery. and poor magnification performance

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