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Lithium Ni-Co aluminate positive electrode material co-doped with negative ions and positive ions and preparation method of positive electrode material

A technology of nickel cobalt lithium aluminate, anion and cation, used in battery electrodes, electrical components, circuits, etc., can solve the problems of cycle life and poor capacity of ternary cathode materials, and achieve enhanced electrochemical performance, reduced oxygen evolution, stable The effect of material structure

Active Publication Date: 2018-06-22
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a mixed anion-cation doped nickel-cobalt-lithium-aluminate positive electrode material and a preparation method thereof, aiming at solving the problems of cycle life and capacity of the existing nickel-cobalt-lithium-aluminate ternary positive electrode material. poor technical problem

Method used

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  • Lithium Ni-Co aluminate positive electrode material co-doped with negative ions and positive ions and preparation method of positive electrode material
  • Lithium Ni-Co aluminate positive electrode material co-doped with negative ions and positive ions and preparation method of positive electrode material
  • Lithium Ni-Co aluminate positive electrode material co-doped with negative ions and positive ions and preparation method of positive electrode material

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preparation example Construction

[0022] Such as figure 1 As shown, the preparation method of the nickel-cobalt-lithium-aluminate positive electrode material provided by the invention provided by mixed anion and cation doping comprises the following steps:

[0023] S1. Pre-sintering step: Weigh the nickel-cobalt-lithium-aluminate precursor, spray a certain amount of baking soda solution and F solution, then mix evenly, transfer to the sintering furnace for low-temperature pre-sintering, and then rapidly heat up for a period of time Pre-sintering at high temperature to obtain a porous pre-sintered precursor.

[0024] The mass percent concentration of the baking soda solution is 5%-10%, the spraying amount accounts for 1%-10% of the total mass of the nickel-cobalt lithium aluminate precursor, and the mass percent concentration of the F solution is 0.2%-1.5%, The F solution accounts for 1%-5% of the total mass of the nickel cobalt lithium aluminate precursor, and the F solution is NH4F, NaF, MgF 2 One of them; ...

Embodiment

[0036] 1) Weigh 100g nickel cobalt lithium aluminate precursor, and spray 5% baking soda solution and 0.2% NH 4 F solution, mixed evenly, and then transferred to the sintering furnace for pre-sintering. The mass ratio of the amount sprayed on the baking soda solution to the precursor of lithium nickel cobalt aluminate is 5%, and the spray amount of F solution accounts for 2% of the total mass of the precursor of lithium nickel cobalt aluminate. The temperature was raised rapidly at 5°C / min, and the temperature was raised to 600°C for 10 hours to obtain a porous pre-calcined precursor.

[0037] 2) Weigh 100g of the pre-sintered precursor that has formed a hole shape, and add the pre-sintered precursor to 1% NbCl while stirring and heating 5 solution and 2% MgCl 2solution, and then mixed uniformly to obtain a spare sample. The mass ratio of the pre-calcined precursor to the mixed solution of Mg and Nb was 1:10, the stirring temperature was 40° C., and the stirring time was 1 ...

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Abstract

The invention is applicable to the technical field of a lithium battery and provides a lithium Ni-Co aluminate positive electrode material co-doped with negative ions and positive ions and a preparation method of the positive electrode material. The method comprises the steps of firstly, pre-sintering a lithium Ni-Co aluminate NCA precursor to form a porous honeycomb quasi-spherical pre-sintered precursor by employing a pre-sintering method of spraying a sodium bicarbonate solution and an F solution; secondly, preparing a solution from a Mg source and Nb source according to a proportion, mixing with the pre-sintered precursor under a water system, and effectively guiding a Mg and Nb solution into a positive electrode material substrate through honeycomb holes; thirdly, spraying an F ion regulation agent solution during material mixing and lithium supplement by a high mixing machine so that materials are fully and uniformly mixed; and finally, performing high-temperature sintering to make a finished product crystallized so as to obtain the lithium Ni-Co aluminate positive electrode material co-doped with the negative ions and the positive ions. In the positive electrode material, positive ion mixing can be reduced by Nb<4+>, polarization can be reduced by Mg<3+>, the electrochemical performance is improved, no electrochemical reaction of Mg<3+> / Nb<4+> is generated during the charging process, no valence-state change is generated, and an effect of stabilizing a crystal structure can be achieved; and moreover, oxygen can be fixed by F negative ion doping, oxygen precipitationis reduced, the material structure is stabilized, and the cycle property is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a nickel-cobalt-lithium-aluminate cathode material mixed with anion and cation doping and a preparation method thereof. Background technique [0002] Nickel cobalt lithium aluminate ternary cathode material is widely used in IT products and new energy vehicles due to its high energy density. However, pure nickel-cobalt-aluminate lithium (LNCA) is prone to cation mixing due to its poor structural stability and high nickel content. 2 + and Li+ occupy each other, which hinders Li+ transmission and destroys the crystal structure of the material, and the transmission ability of Li+ between grain boundaries is poor, which causes great harm to the cycle life and capacity of the material. Contents of the invention [0003] In view of the above problems, the object of the present invention is to provide a mixed anion-cation doped nickel-cobalt-lithium-aluminate positive elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 许开华李伟徐世国许国干张玉军刘钰王星宁
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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