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Positive electrode material and preparation method and application thereof

A cathode material and slurry technology, applied in the field of cathode materials and their preparation, can solve the problems of poor cycle life and low compaction density of lithium iron phosphate materials, achieve excellent coating quality, reduce high-temperature solid-phase sintering temperature and Sintering time, the effect of increasing the compaction density

Active Publication Date: 2020-04-28
合肥国轩科宏新能源科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, it is necessary for the present invention to provide a positive electrode material and its preparation method and application, first by introducing (C 6 h 9 NO)n to obtain a uniform carbon-coated lithium iron phosphate precursor, and then introduce β-LiAl(SiO 3 ) 2 The obtained positive electrode material has high compaction density and long cycle life, and solves the technical problems of low compaction density and poor cycle life of the existing lithium iron phosphate material

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  • Positive electrode material and preparation method and application thereof
  • Positive electrode material and preparation method and application thereof
  • Positive electrode material and preparation method and application thereof

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preparation example Construction

[0028] The invention firstly discloses a method for preparing a positive electrode material, comprising the following steps:

[0029] Add iron source, lithium source and carbon source (C 6 h 9 NO) n dispersion liquid, obtain slurry;

[0030] Grinding and drying the slurry to obtain a precursor I;

[0031] The precursor I and β-LiAl(SiO 3 ) 2 After mixing, the precursor II is obtained;

[0032] The positive electrode material is obtained by crushing and classifying the precursor II after solid-state sintering under a protective atmosphere.

[0033] Lithium iron phosphate is one of the most researched lithium ion cathode materials at present. Its preparation is generally obtained by mixing iron source, lithium source, and carbon source to prepare a precursor first, and then sintering the precursor. In the present invention, by adding iron source, lithium source, carbon source (C 6 h 9 NO)n dispersion liquid, dried after grinding to obtain carbon-coated precursor I first,...

Embodiment 1

[0045] 116g (C 6 h 9 NO) 4000 Add to 5kg pure water and stir well to form a dispersion, then add 3kg FePO to the dispersion 4 , 0.74kg Li 2 CO 3 and 0.29kg C 6 h 12 o 6 , fully stirred evenly and then ground to obtain a mixed slurry with D50=400nm;

[0046] The mixed slurry is dried to obtain the precursor I of lithium iron phosphate, according to the precursor I and β-LiAl(SiO 3 ) 2 The mass ratio of 1:0.003, the precursor Ⅰ and 12.5g β-LiAl (SiO 3 ) 2 Uniformly mixed to obtain precursor II, the precursor II in N 2 After solid-state sintering at 700 °C for 9 hours in the atmosphere, it was pulverized and classified to obtain a composition of LFP / C / β-LiAl(SiO 3 ) 2 The lithium iron phosphate cathode material has a particle size distribution of D10=0.28 μm, D50=1.0 μm, and D100=7.6 μm.

Embodiment 2

[0048] 140g (C 6 h 9 NO) 3000 Add to 5kg pure water and stir well to form a dispersion, then add 2.9kg FePO to the dispersion 4 , 0.74kg Li 2 CO 3 and 0.28kg C 6 h 12 o 6 , fully stirred evenly and then ground to obtain a mixed slurry with D50=433nm;

[0049] The mixed slurry is dried to obtain the precursor I of lithium iron phosphate, according to the precursor I and β-LiAl(SiO 3 ) 2 The mass ratio of 1:0.003, the precursor Ⅰ and 13.8g β-LiAl (SiO 3 ) 2 Uniformly mixed to obtain precursor II, the precursor II in N 2 After solid-state sintering at 700 °C for 9 hours in the atmosphere, it was pulverized and classified to obtain a composition of LFP / C / β-LiAl(SiO 3 ) 2 The lithium iron phosphate cathode material has a particle size distribution of D10=0.33 μm, D50=1.2 μm, and D100=8.4 μm.

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Abstract

The invention discloses a positive electrode material and a preparation method and application thereof. The preparation method comprises the steps of adding an iron source, a lithium source and a carbon source into a (C6H9NO)n dispersion liquid to obtain slurry; grinding and drying the slurry to obtain a precursor I; mixing the precursor I with beta-LiAl (SiO3)2 to obtain a precursor II; and carrying out solid-phase sintering on the precursor II in a protective atmosphere, crushing and grading to obtain the positive electrode material. The positive electrode material prepared by the method ishigh in compaction density and long in cycle life.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high power density, long cycle life, green and pollution-free, and are widely used in electric vehicles, drones, smart phones, notebook computers, camcorders, electronic cigarettes, smart wearable electronic products, etc. equipment. Cathode material, negative electrode material, diaphragm and electrolyte are the four key materials of lithium-ion batteries, which determine the performance of lithium-ion batteries. Among them, the cathode material is one of the most critical materials in lithium-ion battery materials, and its performance also determines the performance of lithium-ion batteries. performance of lithium-ion batteries. [0003] Commonly used lithium-ion battery cathode materia...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 屈杨
Owner 合肥国轩科宏新能源科技有限公司
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