A kind of preparation method of carbon fluoride cathode material with high specific capacity

Abstract

A method for preparing a carbon fluoride cathode material with high specific capacity. It comprises the following steps: at least one of iron-based, cobalt-based, nickel-based and manganese-based metal organic framework materials is subjected to high-temperature carbonization in an inert gas atmosphere, and then cooled to room temperature to obtain a carbon source of carbon fluoride precursor; The carbon source of the carbonized carbon precursor is placed in a reaction kettle to dry, and a mixed gas composed of fluorine and nitrogen is introduced, and the fluorination reaction is carried out under heating conditions. The metal fluoride is washed away to obtain the final product. Advantages of the present invention: (1) low raw material cost, low fluorination temperature, simple operation and graphitization degree of carbon source structure can be adjusted according to carbonization temperature; (2) carbon fluoride positive electrode material has rich inner pores and high specific surface area; (3) ) The carbon fluoride cathode material has good chemical stability, high discharge specific capacity, and large discharge specific energy, and can be applied to lithium-ion batteries and other fields, and has very good application prospects.

Description

technical field [0001] The invention belongs to the technical field of carbon material synthesis, and in particular relates to a preparation method of a carbon fluoride cathode material with high specific capacity. Background technique [0002] Fluorinated carbon materials have great application value and can be widely used in the fields of lithium battery cathode materials, solid lubricants, release agents, waterproof and oil-repellent materials, surface paints, etc. Among them, lithium fluoride carbons prepared as lithium battery cathode materials Batteries have the highest theoretical energy density among existing primary batteries, therefore, lithium fluoride batteries are considered to be the main replacement for future primary batteries. [0003] Generally, the discharge specific capacity of fluorinated carbon materials prepared by using graphitized carbon sources is higher than that of non-graphitized carbon sources. For example, the specific capacity of fluorinated ...

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Problems solved by technology

For example, the specific capacity of fluorinated graphene and fluorinated carbon nanotubes is the highest among the reported fluorinated carbon materials, but their industrial preparation methods are relatively harsh, requiring fluorination with fluorine gas at high temperatures (greater than 500 °C), More importantly, the price of graphene and carbon nanometer raw materials is relatively high. Therefore, the current fluorinated graphene and fluorinated carbon nanotube cathode materials are not conducive to industrial production and large-scale market promotion.