A kind of preparation method and application of spherical cobalt oxalate

Abstract

The invention discloses a preparation method and application of spherical cobalt oxalate. First, an oxalic acid solution is dropped dropwise into a cobalt acetate solution containing cetyltrimethylammonium bromide, and the dropwise addition is performed while stirring, and then a precursor is added dropwise. The body water is heated for a period of time, and then washed and dried to obtain uniform spherical cobalt oxalate with regular morphology and particle size of 1-1.2 μm. After 350 cycles at A / g, it still has a specific capacity of 609mAh / g, which is a potential anode material for lithium-ion batteries. The disclosed method is simple, the shape and particle size of spherical cobalt oxalate are easy to control, and it is expected to turn waste into treasure after extracting cobalt ions in waste lithium batteries with oxalic acid solution, which has 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 preparation method and application of spherical cobalt oxalate. Background technique [0002] At present, energy-saving and environmentally 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 a negative electrode material for 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-ion battery 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, and is a new type of high-performance lithium-ion battery anode material, an...

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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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