Method for fluorination modification of electrode material

Abstract

The invention relates to a method for fluorination modification of an electrode material. The method is characterized in that the electrode material or a precursor thereof is mixed with a liquid fluorine-containing material, and the mixture is subjected to treatment at a certain temperature to obtain a product; as the liquid fluorine-containing material reacts with the electrode material or the precursor thereof, the electrode material or the precursor thereof can be effectively mixed with the liquid fluorine-containing material uniformly, the reaction temperature is lowered, the problem that uniform mixing of raw materials in an electrode material fluorination process and the reaction process cannot be controlled effectively is solved, the explosion risk caused by fluorine gas is eliminated, the surface and interfacial properties of an electrode can be improved, the structural stability of an electrode structure and ordering of ions arranged in crystal lattices can be improved, the destruction of hydrofluoric acid generated in decomposition of an electrolyte can be inhibited, and the safety characteristic, the electrode reaction kinetic feature and the cycling stability of the electrode material are improved. The method has the advantages that the reaction condition is mild; the reaction is easy to control; the granularity and the morphology of the obtained product are easy to control; the energy consumption is low; the preparation method process is simple; the cost and the investment are low; the benefit is good; energy conservation, emission reduction, cleanness and environmental protection are realized.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a method for fluorination modification of electrode materials. Background technique [0002] In recent years, due to the increasingly serious problems of energy crisis and environmental pollution, (hybrid) electric vehicles have been favored by the world, and lithium-ion batteries as power systems have the advantages of zero emissions, high energy density, repeated cycle use, and no memory effect. , has become a research hotspot in various countries. Electrode materials include positive electrode materials and negative electrode materials. At present, the positive electrode materials mainly include lithium cobalt oxide, lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium nickel cobalt oxide, lithium manganese oxide, etc. Among them, lithium cobalt oxide is widely used in the field of electronic products. It has the adv...

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Problems solved by technology

However, the direct use of highly active fluorine gas to react with graphite powder has a great explosion safety hazard, and the formation temperature of the product is close to the decomposition temperature, the reaction process is violent, and it is difficult to effectively control

Therefore, the problems existing in the current fluorination process mainly include: it is difficult to mix the electrode material powder and the fluorine-containing substance powder uniformly, the fluorine gas is prone to dust explosion with the powder due to its high activity, and it is difficult to effectively control the fluorine content

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