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Preparation method of lithium iron phosphate material

A lithium iron phosphate and slurry technology, applied in the field of materials, can solve the problems of low carbon residual rate of polymer carbonization, difficulty in forming a uniform and dense carbon coating layer, fracture, etc., and achieves improved anti-aging ability, low cost and simple process. Effect

Inactive Publication Date: 2020-05-08
ZHONGTIAN EMERGING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But generally speaking, without additives, including polyethylene glycol (PEG), polypropylene (PP), polyethylene (PE), polystyrene (PS) and polyethylene terephthalate (PET), etc. Common high-molecular polymers will melt due to the increase in temperature when heated. When the heating continues and exceeds its thermal decompositi

Method used

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  • Preparation method of lithium iron phosphate material
  • Preparation method of lithium iron phosphate material
  • Preparation method of lithium iron phosphate material

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preparation example Construction

[0032] A preparation method of a lithium iron phosphate material in a specific embodiment of the present invention comprises the following steps:

[0033] Step S1: Mix the iron source, lithium source, and phosphorus source with the solvent according to the preset molar ratio to form a slurry, then add the first preset mass ratio of the polymer carbon source, stir and coarsely grind to form a lithium iron phosphate precursor slurry. in,

[0034] The iron source includes one of ferric phosphate, ferrous oxalate, and ferric oxide, the lithium source includes one or both of lithium carbonate, lithium hydroxide monohydrate, and lithium acetate, and the phosphorus source includes phosphoric acid One of lithium dihydrogen and ammonium dihydrogen phosphate; the solvent is one or more of water, absolute ethanol, and acetone. The preset molar ratio of the iron source, lithium source, and phosphorus source is that the molar ratio of the iron element, lithium element, and phosphorus ele...

Embodiment 1

[0043] Embodiment 1: Get 500g anhydrous ferric phosphate and 125g lithium carbonate and join in the aqueous solution, add 50g polyvinyl alcohol (PVA) and grind 2h at high speed in ball mill, add 35g glucose again after being dispersed evenly, use superfine grinder to carry out fully After grinding for 2 hours, the median particle size of the slurry is controlled at 0.2-1.0 μm to obtain a precursor slurry. The above slurry is then dehydrated by a centrifugal spray dryer to obtain lithium iron phosphate precursor particles. Put the precursor particles into a tube furnace, and in a nitrogen atmosphere of 15mL / min, raise the temperature to 350°C at a rate of 5°C / min and keep it for 3h, then raise the temperature to 700°C at the same rate and keep it for 12h, and finally in the same nitrogen atmosphere Lower the temperature to room temperature, take out the cooled lithium iron phosphate and pulverize it with a jet mill to obtain a lithium iron phosphate positive electrode material ...

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Abstract

The invention provides a preparation method of a lithium iron phosphate material, which comprises the following steps: mixing an iron source, a lithium source and a phosphorus source with a solvent according to a preset molar ratio to form slurry, adding a polymer carbon source in a first preset mass ratio then, stirring, and coarsely grinding to obtain lithium iron phosphate precursor slurry; adding a second preset mass ratio of organic small molecule carbon source into the lithium iron phosphate precursor slurry, stirring, and finely grinding to obtain precursor secondary slurry; and dryingthe precursor secondary slurry to remove moisture, granulating, and roasting to obtain the lithium iron phosphate material. The method is simple in process, low in cost and capable of achieving one-time coating, the prepared lithium iron phosphate material guarantees the uniformity of a coating layer under the condition of low carbon content, the conductivity of the material is improved, the electrochemical performance of the material is not obviously attenuated after the material makes contact with air, and the anti-aging capacity of the material is obviously improved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a preparation method of lithium iron phosphate material. Background technique [0002] The good safety performance, cycle performance and low cost of lithium iron phosphate make it have obvious competitive advantages in the energy storage market, and it is the main technical direction of energy storage lithium-ion batteries at present. Lithium iron phosphate cathode material is weakly alkaline, and exposure to the air can easily cause material aging, and a series of performance attenuation problems such as lithium deposition on the surface of the material, poor electronic conductivity, and decreased electrochemical performance will affect the performance of lithium-ion batteries. Although as early as 2010, the Nicolas Dupre group introduced the aging mechanism of lithium iron phosphate and proved that the structure can be repaired by high-temperature thermal reduction treatment...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 方秀利战鹏孙兵陆仁杰
Owner ZHONGTIAN EMERGING MATERIALS CO LTD
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