Preparation method of Ni-P alloy lithium ion battery cathode material of core-shell structure

Abstract

The invention discloses a preparation method of a Ni-P alloy lithium ion battery cathode material of a core-shell structure, which comprises the following steps of: mixing choline chloride, ethylene glycol and propylene glycol to obtain a mixed solution, orderly adding NiCl12 and NH4H2PO2 to the mixed solution to obtain a reaction precursor solution after ultrasonic dissolving, heating and back flowing the reaction precursor solution, and taking out precipitates to be processed to obtain final products. In the mixed solution, the molar ratio of choline chloride to ethylene glycol to propylene glycol is (0.5-1): (0.5-1.5): (0.5-1.5). The concentration of NiC12 and NH4H2PO is 0.01-1 mol / L based on the volume of the mixed solution is 1L. The raw materials adopted by the preparation method disclosed by the invention are common and easy to obtain, and the preparation process is simple and available. Reaction system components of the preparation method disclosed by the invention are simple, and the preparation method disclosed by the invention adopts a normal pressure and high temperature single-step backflow method, and has the advantages of simplicity in operation, no steam exhaust, energy conservation and environmental protection.

Description

Technical field [0001] The invention belongs to the technical field of materials and chemical power sources, and specifically relates to a method for preparing a core-shell structured Ni-P alloy lithium ion battery negative electrode material. Background technique [0002] As a high-performance rechargeable green power source, lithium-ion batteries have been widely used in various communication tools and portable electronic products in recent years, and will gradually be developed as the power source of electric vehicles, thereby promoting their safety, environmental protection, and low cost. The development of cost and high specific energy. The rapid development of new high-energy chemical power technology also puts forward higher requirements for battery materials. New battery materials with high energy density, high power density, low cost, and environmentally friendly are the current and future research priorities. The negative electrode material of lithium ion battery is a ...

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Problems solved by technology

[0003] The commonly used methods for preparing various nanostructures of Ni-P alloys, such as nanopowders, nanowires, and nanohollow spheres, include hydrothermal method, oxidation-reduction method of transition metal phosphate, and decomposition reaction method of metal complexes. Among them, nanotubes, nanowires and other structures of Ni-P alloys generally need templates to assist the formation of their nanostructures. For example, the Chinese patent with the authorized announcement number CN100546916C discloses a preparation method of nickel phosphorus chromium nano-titanium dioxide amorphous nanocomposite , where nano-TiO 2 The materials are nanowires and nanotubes prepared by the AAO template method. Although the composite material prepared by this method has good seawater corrosion resistance, the method for preparing nanowires and nanotubes by the AAO template method is cumbersome, making the entire preparation process difficult. process becomes complicated

[0004] The traditional wet chemical method and solid-state reaction method generally require higher temperature (>400°C) treatment to obtain nanostructured Ni-P alloy powders for lithium-ion battery anode materials; traditional wet chemical methods Generally, water solvent is used as the reaction solvent, so that the reaction can only be carried out under extreme conditions (such as high pressure conditions). The process is not only cumbersome, but the harsh experimental conditions also have high requirements for experimental equipment. At the same time, there are hidden dangers in the safety of the reaction.

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