Preparation method and application of spherical cobalt oxalate

Abstract

The invention discloses a preparation method and application of spherical cobalt oxalate. The preparation method comprises the steps that an oxalic acid solution is dropwise added into a cobalt acetate solution containing cetyltrimethylammonium bromide, stirring is carried out while dropwise adding is carried out, then a precursor is subjected to hydrothermal treatment for a period of time, washing and drying are carried out, and uniform spherical cobalt oxalate with the regular morphology and the particle size being 1-1.2 micrometers can be obtained. The specific capacity of the lithium ion battery negative electrode material reaches up to 1029 mAh / g under the current density of 0.1 A / g, the specific capacity of the lithium ion battery negative electrode material is still 609 mAh / g after 350 cycles under the current density of 0.5 A / g, and the lithium ion battery negative electrode material has application potential. The method disclosed by the invention is simple, the morphology and the particle size of the spherical cobalt oxalate are easy to control, and the cobalt ions in the waste lithium battery are expected to be changed into things of value after being extracted by using an oxalic acid solution, so that the method has relatively great industrial application potential and economic value.

Description

technical field [0001] The present application relates to the field of preparation of cobalt oxalate, in particular to a method for preparing spherical cobalt oxalate and its application. Background technique [0002] At present, energy-saving and environment-friendly electric vehicles have received more and more attention. The heart of an electric vehicle lies in the battery, more precisely in the lithium-ion battery material. At present, the theoretical specific capacity of commercial graphite as the anode material of lithium-ion batteries is only 372mAh / g, which cannot meet the demand for higher energy density of electric vehicles. Therefore, it is urgent to develop a new lithium with higher capacity, longer service life and lower cost. Ion battery material. [0003] Transition metal oxalate has the advantages of easy preparation, low cost, and high theoretical capacity. It is a new type of high-performance lithium-ion battery anode material, and its capacity far exceed...

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Problems solved by technology

[0005] Through retrieval, Chinese Patent Publication No. 101570478A discloses spherical cobalt oxalate powder and its preparation method. The technical solution is to obtain potassium oxalate solution and cobalt salt solution by dissolving potassium oxalate and water-soluble cobalt salt respectively; The temperature of the cobalt salt solution is the same, the potassium oxalate solution is quickly added to the cobalt salt solution, the constant temperature is stirred to promote the precipitation reaction of the mixed solution, and the prepared spherical cobalt oxalate has a particle size of 0.5-20 μm. The shape and size of the particles vary greatly, and the repeatability of the material is not good, so it cannot be directly used as the negative electrode material of lithium-ion batteries

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