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Carbon-coated lithium iron phosphate cathode material and preparation method thereof

A carbon-coated lithium iron phosphate and cathode material technology, which is applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as high price, difficulty in achieving good dispersion between nanoparticles, and lithium iron phosphate losing its cost-effectiveness advantage. Facilitate production management, improve electrochemical performance, good adsorption effect

Active Publication Date: 2022-01-04
ZHONGTIAN EMERGING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, it is difficult for these introduced materials to achieve good dispersion among nanoparticles, and on the other hand, their high price will make lithium iron phosphate lose its original cost-effective advantage and be at a disadvantage in market competition

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  • Carbon-coated lithium iron phosphate cathode material and preparation method thereof
  • Carbon-coated lithium iron phosphate cathode material and preparation method thereof
  • Carbon-coated lithium iron phosphate cathode material and preparation method thereof

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preparation example Construction

[0024] One aspect of the present invention provides a method for preparing a carbon-coated lithium iron phosphate cathode material, comprising the following steps:

[0025] mixing an iron-containing compound, a lithium-containing compound, a phosphorus-containing compound, and a polymer dispersant with a solvent to form a first slurry;

[0026] mixing the first slurry with oligosaccharides to form a second slurry;

[0027] drying the second slurry to make a precursor;

[0028] After the precursor is calcined, a graphitized carbon-coated lithium iron phosphate cathode material is obtained.

[0029] Based on the concept of organic carbon cracking to generate carbon layers in situ on the surface of lithium iron phosphate nanoparticles, the present invention proposes a method for combined design of organic carbon sources: through the combined use of oligosaccharides and polymer dispersants, only by adding a small amount of organic The carbon source can form a uniform, ultra-thin...

Embodiment 1

[0047] Accurately weigh 1000g of commercially available ferric orthophosphate, 13.5g of lithium dihydrogen phosphate, 246g of lithium carbonate, 11g of PEG8000 and 5.5g of PEG4000 (the molar ratio of PEG8000 and PEG4000 is 1:1), add 2000g of deionized water, and use a ball mill to pre-grind After mixing for 2 hours, add 100 g of glucose, continue grinding for 2 hours, and send the slurry to a sand mill for grinding. After the particle size reaches 0.30±0.05 μm, the slurry is spray-dried, and the dried precursor is placed in a nitrogen atmosphere furnace. The temperature was raised to 650°C at a heating rate of 5°C / min, and then cooled to room temperature after calcination at a constant temperature for 10 hours. After the material was pulverized, a lithium iron phosphate cathode material coated with a combined carbon source was obtained.

[0048] The median particle size of the product obtained in this example is 1.5 μm, and the tap density is 1.08 g / cm 3 , the carbon content i...

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Abstract

The invention provides a carbon-coated lithium iron phosphate positive electrode material and a preparation method thereof. The method comprises the following steps: mixing an iron-containing compound, a lithium-containing compound, a phosphorus-containing compound and a polymer dispersant with a solvent to form a first slurry; mixing the first slurry with oligosaccharides to form a second slurry; drying the second slurry to make a precursor; calcining the precursor to obtain graphitized carbon-coated Lithium iron phosphate cathode material. The carbon-coated lithium iron phosphate positive electrode material prepared by the present invention has a uniform and dense carbon coating layer, thin thickness, and good electrical conductivity, which can effectively improve the electrochemical performance of the material, and has low implementation cost, is convenient for production management, and is suitable for large-scale applications. industrialized production.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a carbon-coated lithium iron phosphate positive electrode material and a preparation method thereof. Background technique [0002] The development of lithium-ion battery cathode materials is closely related to the performance of lithium-ion batteries, so people have been actively developing new lithium-ion battery cathode materials. At present, the existing lithium-ion battery cathode materials in the market mainly include: lithium manganese oxide (LiMn 2 o 4 ), lithium iron phosphate (LiFePO 4 ), ternary materials (NCA&NCM) and lithium cobalt oxide (LiCoO 2 ). Among them, lithium iron phosphate is the cathode material with the highest safety performance, the best cycle performance, the lowest cost and the most environmentally friendly so far, so it is favored in the field of lithium-ion batteries. However, the traditional lithium iron ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 战鹏方秀利黄勇金鹰
Owner ZHONGTIAN EMERGING MATERIALS CO LTD
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