Method for preparing in-situ carbon coated manganese carbonate for negative electrode of lithium ion battery

Abstract

The invention discloses a one-step method for in-situ preparation of carbon coated manganese carbonate for the negative electrode of a lithium ion battery .The method specifically comprises the steps of 1, preparing potassium permanganate solution of certain concentration and carbon source solution of certain concentration respectively, wherein the molar concentration ratio of the carbon source solution to the potassium permanganate solution is 1:(2-2.5); 2, adding the carbon source solution to the potassium permanganate solution, and conducting stirring dispersion and ultrasonic treatment in sequence; 3, adding dispersed solution into a reaction still to be heated for 3-24 h at the temperature of 120-180 DEG C; 4, naturally cooling the reaction still to room temperature, and conducting cleaning and drying to obtain powder, namely the in-situ carbon coated manganese carbonate for the negative electrode of a lithium ion battery .Raw materials for preparation are cheap and easy to obtain, operation is easy, energy consumption is low, pollution is avoided, carbon coating of the obtained manganese carbonate is uniform, size distribution is uniform, purity is high, particle collapse during charging and discharging of manganese carbonate can be effectively prevented, and the cycling stability of the lithium ion battery is improved.

Description

Technical field [0001] The invention relates to the technical field of battery materials, in particular to a preparation method of in-situ carbon-coated manganese carbonate for lithium ion battery negative electrodes. Background technique [0002] With the vigorous development and wider application of lithium-ion batteries, the market has put forward higher requirements for its portability and energy density. As an important part of lithium-ion batteries, the influence of anode materials on performance is very important. However, the existing commercial anode material carbon anode has been difficult to meet such requirements, so research and modification of various alternative anode materials is an important method to solve this problem. [0003] At present, anode materials can be divided into three types from the perspective of lithium storage mechanism: insertion type, alloy type and conversion type. Compared with alloy type and insertion type electrodes, the conversion type ne...

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Problems solved by technology

[0004] The object of the present invention is exactly in order to solve the above-mentioned problems, provide a kind of method of one-step in situ preparation carbon-coated manganese carbonate for negative electrode of lithium ion battery, the preparation raw material of this method is cheap and easy to get, simple operation, less energy consumption, no pollution, the obtained The manganese carbonate carbon coating is uniform, the particle size distribution is uniform, and the purity is high, which can effectively prevent the particle collapse during the charge and discharge process of manganese carbonate and improve the cycle stability of lithium-ion batteries.

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