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Zirconium tetrafluoride-coated fluorine-aluminum double-doped lithium manganate positive electrode material and preparation method thereof

A positive electrode material, zirconium tetrafluoride technology, applied in chemical instruments and methods, positive electrodes, manganate/permanganate, etc., can solve the problem of first-time capacity reduction and poor rate performance of modified lithium manganate positive electrode active materials And other issues

Pending Publication Date: 2020-11-27
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Therefore, researchers often use bulk doping and surface coating co-modification methods to improve the electrochemical performance of cathode materials, such as F, Al double doping and metal oxide coating co-modification, but the existing modification The modified lithium manganate positive electrode active material obtained by the method still has the disadvantage of the first capacity reduction, resulting in poor rate performance of the modified lithium manganate positive electrode active material

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  • Zirconium tetrafluoride-coated fluorine-aluminum double-doped lithium manganate positive electrode material and preparation method thereof
  • Zirconium tetrafluoride-coated fluorine-aluminum double-doped lithium manganate positive electrode material and preparation method thereof
  • Zirconium tetrafluoride-coated fluorine-aluminum double-doped lithium manganate positive electrode material and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a method for preparing the zirconium tetrafluoride-coated fluoroaluminum double-doped lithium manganate positive electrode material described in the above technical solution, comprising the following steps:

[0040] After mixing the manganese source, the lithium source, the aluminum source and the first fluorine source according to the stoichiometric ratio of the core, performing the first calcination to obtain the core;

[0041] Weighing the zirconium source and the second fluorine source according to the stoichiometric ratio as shell raw materials;

[0042] mixing the shell material with the core to form a cladding layer on the surface of the core to obtain a positive electrode material precursor;

[0043] The anode material precursor is subjected to the second calcination to obtain a fluorine-aluminum double-doped lithium manganate cathode material coated with zirconium tetrafluoride.

[0044] In the present invention, after mixin...

Embodiment 1

[0082] Preparation of ZrF 4 The mass percentage content is 3%, and the core is Li 1.02 Al 0.05 mn 1.95 o 3.95 f 0.05 The positive electrode material, its specific steps are as follows:

[0083] (1) Take by weighing 50g manganese dioxide in a 250mL ball mill jar, and ball mill it for 8h at a rotating speed of 105rpm, wherein the grinding balls used are zirconium balls with a diameter of 20mm and zirconium balls with a diameter of 8mm according to the mass ratio of 1: Mixed in a ratio of 1, the ratio of material to ball is 1:4; after the ball milling is completed, pass through a 200-mesh sieve to separate the grinding balls to obtain manganese dioxide with an average particle size of 6 μm;

[0084] 27.9451g of manganese dioxide with a particle size of 6 μm, 0.1965g of lithium fluoride, 0.6031g of aluminum hydroxide and 5.5994g of lithium carbonate were placed in a ball mill jar, and ball milled for 1 hour at a speed of 105rpm, wherein the grinding balls used were Zirconium...

Embodiment 2

[0088] Prepare ZrF according to the method for embodiment 1 4 The mass percentage content is 2%, and the core is Li 1.02 Al 0.05 mn 1.95 o 3.95 f 0.05 The positive electrode material, abbreviated as LMO-Al0.05F0.05@2%ZrF 4 , the difference is that the quality of zirconyl nitrate in step (2) is 0.1383g, and the quality of ammonium fluoride is 0.0885g.

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Abstract

The invention provides a zirconium tetrafluoride-coated fluorine-aluminum double-doped lithium manganate positive electrode material and a preparation method thereof, and belongs to the field of lithium ion batteries. The zirconium tetrafluoride-coated fluorine-aluminum double-doped lithium manganate positive electrode material provided by the invention comprises a core and a shell layer; the corehas a chemical composition shown as a formula I: Li1+xAlyMn2-yO4-zFz, x is greater than or equal to 0 and less than or equal to 0.5, y is greater than 0 and less than or equal to 0.3, and z is greater than 0 and less than or equal to 0.2; and the shell layer is ZrF4. According to the invention, Al and F are used as binary ions for double-doped modification of lithium manganate to improve the order degree of the lithium manganate, stabilize the spinel structure and inhibit the lattice distortion, and ZrF4-coated fluorine-aluminum double-doped modified lithium manganate is used to effectively relieve the capacity attenuation, effectively prevent the corrosion of the electrolyte and reduce the dissolution of the manganese ions, and the obtained positive electrode material has advantages of excellent rate performance and excellent cycle stability.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a zirconium tetrafluoride-coated fluorine-aluminum double-doped lithium manganate positive electrode material and a preparation method thereof. Background technique [0002] With the rapid development of new energy vehicles and wireless products (such as mobile phones), lithium-ion batteries with high energy density, long cycle life and no memory effect have received more and more attention. The positive electrode active material of lithium ion battery has a decisive effect on the performance of lithium ion battery. Therefore, the research on the positive electrode active material of lithium ion battery has become a hot spot in the research of lithium ion battery. [0003] Lithium manganate is favored because of its high energy density, high working voltage, low cost, environmental friendliness, and good safety performance, and has become an important commercial cathode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525C01G45/12
CPCH01M4/366H01M4/505H01M4/628H01M10/0525C01G45/12C01G45/1242C01P2004/03C01P2002/72H01M2004/021H01M2004/028Y02E60/10
Inventor 陈召勇周灿凯
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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