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Preparation method of nickel-cobalt-manganese-aluminum composite positive electrode material co-coated with lithium manganese vanadium phosphate and carbon

A technology of lithium manganese vanadium phosphate and positive electrode material, which is applied to positive electrodes, battery electrodes, active material electrodes, etc., can solve problems such as easy collapse and damage to the coating layer, and achieves a simple and easy preparation method and inhibits cation mixing. Effect

Active Publication Date: 2019-11-29
湖北锂诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application 201810985069.2 discloses a preparation method of graphene and manganese-based metal-organic framework co-coated nickel cobalt manganese lithium aluminate cathode material, which effectively improves the rate performance of the cathode material, but the metal-organic framework is calcined at high temperature It is easy to collapse and directly destroy the cladding layer

Method used

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  • Preparation method of nickel-cobalt-manganese-aluminum composite positive electrode material co-coated with lithium manganese vanadium phosphate and carbon
  • Preparation method of nickel-cobalt-manganese-aluminum composite positive electrode material co-coated with lithium manganese vanadium phosphate and carbon

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Li 4 V 2 Mn(PO 4 ) 4 Co-coated LiNi with carbon 0.89 co 0.05 mn 0.05 Al 0.01 o 2 Preparation of positive electrode material: by co-precipitation method, the pH is controlled to be 12 to obtain the precursor, and LiOH·H 2 O and Al(OH) 3 ·3H 2 O mixed, the molar ratio of Li and Ni+Co+Mn+Al is 1.01:1, calcined at 730°C for 10h to obtain high-nickel material LiNi 0.89 co 0.05 mn 0.05 Al 0.01 o 2 . 55.9gLiNi 0.89 co 0.05 mn 0.05 Al 0.01 o 2 Ultrasonic dispersion in 200mL deionized water, add 0.182g vanadium pentoxide and 0.576g citric acid to dissolve, the molar ratio of vanadium pentoxide and citric acid is 1:3, heat to 80°C and stir for 30min, then add 0.245g tetrahydrate Manganese acetate, 0.264g lithium acetate and 0.46g ammonium dihydrogen phosphate continued to stir for 6h until a gel was formed, and the molar ratio of Li:V:Mn:P was 4:2:1:4. Vacuum drying at 120°C for 3h under vacuum, and finally calcination at 700°C for 12h to obtain high-nickel L...

Embodiment 2

[0022] Li 4 V 2 Mn(PO 4 ) 4 Co-coated LiNi with carbon 0.89 co 0.05 mn 0.05 Al 0.01 o 2 Preparation of positive electrode material: by co-precipitation method, the pH is controlled to be 12 to obtain the precursor, and LiOH·H 2 O and Al(OH) 3 ·3H 2 O mixed, the molar ratio of Li and Ni+Co+Mn+Al is 1.02:1, calcined at 760°C for 9h to obtain high-nickel material LiNi 0.89 co 0.05 mn 0.05 Al 0.01 o 2 . 18.27gLiNi 0.89 co 0.05 mn 0.05 Al 0.01 o 2 Ultrasonic dispersion in 200mL deionized water, add 0.182g vanadium pentoxide and 0.576g citric acid to dissolve, the molar ratio of vanadium pentoxide and citric acid is 1:3, heat to 80°C and stir for 30min, then add 0.245g tetrahydrate Manganese acetate, 0.264g lithium acetate and 0.46g ammonium dihydrogen phosphate continued to stir for 6h until a gel was formed, and the molar ratio of Li:V:Mn:P was 4:2:1:4. Vacuum drying at 120°C for 3h under vacuum, and finally calcination at 800°C for 10h to obtain high-nickel L...

Embodiment 3

[0024] Li 4 V 2 Mn(PO 4 ) 4 Co-coated LiNi with carbon 0.89 co 0.05 mn 0.05 Al 0.01 o 2 Preparation of positive electrode material: by co-precipitation method, the pH is controlled to be 12 to obtain the precursor, and LiOH·H 2 O and Al(OH) 3 ·3H 2 O mixed, the molar ratio of Li and Ni+Co+Mn+Al is 1.03:1, calcined at 780°C for 8h to obtain high-nickel material LiNi 0.89 co 0.05 mn 0.05 Al 0.01 o 2 . 10.74gLiNi 0.89 co 0.05 mn 0.05 Al 0.01 o 2Ultrasonic dispersion in 200mL deionized water, add 0.182g vanadium pentoxide and 0.576g citric acid to dissolve, the molar ratio of vanadium pentoxide and citric acid is 1:3, heat to 80°C and stir for 30min, then add 0.245g tetrahydrate Manganese acetate, 0.264g lithium acetate and 0.46g ammonium dihydrogen phosphate continued to stir for 6h until a gel was formed, and the molar ratio of Li:V:Mn:P was 4:2:1:4. Vacuum drying at 120°C for 3h under vacuum, and finally calcination at 900°C for 8h to obtain high-nickel LiN...

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Abstract

The invention relates to a preparation method of a nickel-cobalt-manganese-aluminum composite positive electrode material co-coated with lithium manganese vanadium phosphate and carbon, which comprises the steps of (1) ultrasonically dispersing nickel-cobalt-manganese-aluminum LiNi0.89Co0.05Mn0.05Al0.01O2 in deionized water, adding vanadium pentoxide and citric acid, heating and stirring; (2) adding manganese acetate tetrahydrate, lithium acetate and ammonium dihydrogen phosphate, and continuously stirring until gel is formed; and (3) drying the gel in vacuum, and calcining in a protective gasto obtain the nickel-cobalt-manganese-aluminum positive electrode material co-coated with lithium manganese vanadium phosphate and carbon co-coated. The method is simple in process and easy to operate, raw materials are cheap and easy to obtain, and the prepared cathode material is excellent in electrochemical performance. The method has the advantages of simple process, easy operation and cheapand easily-obtained raw materials, and the prepared positive electrode material is excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a preparation method of nickel-cobalt-manganese-aluminum composite positive electrode materials co-coated with lithium manganese vanadium phosphate and carbon. Background technique [0002] In the high-nickel ternary material, nickel (Ni), cobalt (Co) and manganese (Mn) elements play a good synergistic effect, so it not only has a high charge-discharge specific capacity, stable cycle performance, but also has low cost and is It is environmentally friendly and can be used as a cathode material for lithium-ion batteries. In the research on high-nickel ternary materials, people found that when the nickel content is high, the nickel / lithium mixed arrangement at the octahedral position will disturb the structure of the ternary positive electrode material, which will affect the diffusion rate of lithium, cycle stability, Both ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/505H01M4/485H01M4/5825H01M4/583H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 杨志远王聪张天赐陈中华
Owner 湖北锂诺新能源科技有限公司
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