Carbon-coated ternary positive electrode material and preparation method thereof

Abstract

The invention discloses a carbon-coated ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a ternary positive electrode material precursor by taking nickel salt, cobalt salt and manganese salt as raw materials; S2, preparing a conductive carbon dispersion system, wherein conductive carbon is dispersed in water containing an organic carbon source; S3, adding the ternary positive electrode material precursor and a lithium compound into the conductive carbon dispersion system, and mixing uniformly to obtain a mixture; S4, drying the mixture under a vacuum condition; S5, carrying out high temperature treatment on the dried mixture under a closed condition or in an inert gas protection atmosphere so as to obtain the carbon-coated ternary positive electrode material. The carbon-coated ternary positive electrode material is uniform in coating, simple to operate, low in cost and high in efficiency; the conductive carbon and the ternary positive electrode material are simultaneously coated with network-shaped amorphous carbon which serves as a conductive medium or a channel of the conductive carbon and the ternary positive electrode material, thereby greatly improving the rate performance of the ternary positive electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a method for preparing a carbon-coated ternary positive electrode material for lithium-ion batteries and the carbon-coated ternary positive electrode material. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific energy, high working voltage, good safety, and no memory effect. They are not only widely used as power sources for portable electronic products such as notebook computers, digital cameras, mobile phones, and video cameras, but also Become one of the main power sources of electric bicycles, electric motorcycles and electric vehicles. On the one hand, this provides a broad space for the development of lithium-ion batteries; The most direct way to improve the overall performance of batteries is to improve the performance of battery materials. [0003] As one of the core components of the battery, the ...

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Problems solved by technology

However, the conductivity of the current ternary cathode material is worse than that of lithium cobalt oxide, which still needs to be improved.

Moreover, in the current battery manufacturing process, the granular conductive carbon and the granular positive electrode material are often mixed mechanically. This kind of mixing has the defect that the conductive carbon and the positive electrode material cannot be effectively contacted, which leads to the inability of smooth migration of electrons. , constraining the rate capability of the material

[0005] The existing modification of ternary cathode materials also includes the method of coating ternary cathode materials with organic carbon. The coating of this method requires the use of catalysts to emulsify the organic carbon before coating. The operation method is complicated and requires higher

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