A preparation method of lithium-ion battery cathode material and lithium-ion battery cathode material prepared by the method

Abstract

The invention belongs to the field of energy storage research, and particularly relates to a preparation method of a lithium ion battery positive electrode material. The method mainly comprises the steps of 1, dry-mixing a power source substance 1, nanometer positive primary particles and graphite particles until uniform mixing is achieved; 2, adding an electrolyte 1 and then continuing to mix to form ion passages, stripping the graphite particles under the effect of the power source substance to form an opening structure of a graphite sheet layer, and continuously filling the opening structure of the graphite sheet layer with the nanometer positive primary particles; or 1', uniformly mixing the nanometer positive primary particles, the graphite particles and an electrolyte 2 for use; 2', assembling a power source substance 2 and the product obtained in the step 1' to form paired electrodes, applying a current between the two electrodes, stripping the graphite particles to form the opening structure of the graphite sheet layer, and continuously filling the opening structure of the graphite sheet layer with the nanometer positive primary particles; 3, removing an electrolyte constituent after filling is completed, and performing coating and carbonization to obtain the lithium ion battery positive electrode material. When the method is used for preparing a lithium ion battery positive electrode, the opening of the graphite particle sheet layer and the filling of the nanometer positive primary particles can be simultaneously performed, so that the filling is smoother, and the lithium ion battery positive electrode material is enabled to have favorable electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a preparation method of a positive electrode material of a lithium ion battery and a positive electrode material of a lithium ion battery prepared by the method. Background technique [0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth due to their advantages such as fast charging and discharging, good low-temperature performance, large specific energy, small self-discharge rate, small size, and light weight. Used in various portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: longer standby time, faster charging and discharging speed, etc.; in order to solve the above problems, it is necessary to find new ones with better performance electrode materi...

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Problems solved by technology

At the same time, the contact area between the primary particles of the nanostructure and the conductive agent is small and the gap is large, so the contact resistance is relatively large, and the internal resistance of the finished positive electrode material is relatively large, which affects the lithium ions that use it as the positive electrode material. The electrochemical performance of the battery is fully developed (mainly manifested as large impedance, large polarization, and severe heat generation)

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