Preparation method of a three-dimensional carbon in-situ coated phosphate cathode material
An in-situ coating and cathode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as unreasonable coating structure, material waste, and small performance changes
Active Publication Date: 2018-04-03
杨含霄
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Problems solved by technology
However, traditional coating methods and carbon sources cannot make carbon materials and nanomaterials composite well, and it is easy to cause nanomaterials to agglomerate
In addition, the existing carbon coating methods generally have technical problems such as cumbersome process, serious material waste, unreasonable coating structure and small performance change.
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[0006] The technical scheme of the present invention is as follows:
[0007] A preparation method of three-dimensional carbon in-situ coated phosphate cathode material includes the following steps:
[0008] (1) Dissolve the natural polysaccharide powder in distilled water, stir for 3-10 hours to fully swell the natural polysaccharide to obtain a polysaccharide solution;
[0009] (2) According to the stoichiometric ratio of phosphate, add the manganese source, iron source or / and vanadium source to the solution in step (1), stir to form a hydrogel, and then add the phosphorus source according to the stoichiometric ratio, and stir thoroughly. Form in-situ precipitation in the hydrogel, separate the liquid, and dry it at 80-120°C to obtain a mixture powder;
[0010] (3) Add a lithium source to the powder obtained in step (2) above according to the stoichiometric ratio of phosphate, grind and mix uniformly to obtain a precursor;
[0011] (4) The precursor obtained in step (3) is heat-treate...
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Abstract
The invention relates to a preparation method of a three-dimensional carbon in-situ coated phosphate positive electrode material. The method comprises the following steps: adding an iron source, a vanadium source and a manganese source into a natural polysaccharide solution; forming hydrogel through chelating by utilizing adsorbability on metal ions of polysaccharides; then adding a phosphorus source and precipitating phosphorus-containing groups and the metal ions or ionic groups in the hydrogel in situ; carrying out solid-phase mixing on the hydrogel and a lithium source; and after carrying out reduction heat treatment on the mixture by carbon, compounding to form the three-dimensional carbon in-situ coated phosphate positive electrode material. The polysaccharides have the effect of a nano structure template in a synthesis process of the positive electrode nano material and also have effects of a carbon source in a carbon heat reduction process and a binding agent; and more importantly, the polysaccharides can form a three-dimensional carbon net structure to be coated on the surfaces of nano particles, so that the electrochemical performances of the positive electrode material are improved.
Description
Technical field [0001] The invention relates to a method for preparing an in-situ three-dimensional carbon-coated phosphate lithium ion battery positive electrode material, and belongs to the technical field of lithium ion battery positive electrode materials. Background technique [0002] One of the key factors affecting the performance of lithium-ion batteries is the cathode material. In order to improve the performance of lithium-ion batteries and expand the application range of lithium-ion batteries, research on the modification of cathode materials has become a hot spot. At present, single or composite polyanionic phosphates (such as lithium iron phosphate, lithium vanadium phosphate, and lithium manganese phosphate) have become cathode materials for commercial applications, but they have the disadvantage of low electronic conductivity and have not been improved. Carbon coating is one of the effective modification methods. Carbon coating can not only directly increase the ...
Claims
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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58H01M10/0525
CPCH01M4/36H01M4/5825H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 张旭东何文郭辉
Owner 杨含霄