Lithium nickel-cobalt-iron positive electrode material and preparation method thereof

A cathode material, lithium cobalt ferrite technology, which is applied in the field of nickel cobalt lithium ferrite cathode material and its preparation, can solve the problems of unstable crystal structure and poor material cycle life, and achieves inhibiting grain growth, low cost, and inhibiting effect of reaction

Active Publication Date: 2018-08-14
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 nickel-cobalt lithium ferrite positive electrode material and its preparation method, aiming at solving the technical problems of unstable crystal structure and poor material cycle life of existing positive electrode materials

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  • Lithium nickel-cobalt-iron positive electrode material and preparation method thereof

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preparation example Construction

[0023] The preparation method of the nickel-cobalt lithium ferrite cathode material provided by the invention comprises the following steps:

[0024] Step S1, preparing lithium source, nickel source, cobalt source, indium source and iridium source, mixing the lithium source, nickel source and cobalt source evenly to obtain a solid mixture, adding an appropriate amount of distilled water to the solid mixture, and then adding water to dilute A slurry is obtained; in addition, after uniformly mixing the indium source and the iridium source, a certain amount of distilled water is added to continue mixing to obtain a doping solution.

[0025] In this step, the lithium source is lithium carbonate, lithium oxalate or lithium hydroxide, the nickel source is nickel sulfate or nickel oxalate, the cobalt source is cobalt sulfate or cobalt oxalate, and the indium source is indium sulfate or oxalic acid Indium, the iridium source is iridium sulfate or iridium oxalate.

[0026] The liquid-...

Embodiment

[0038] At room temperature, prepare materials according to the molar ratio of lithium hydroxide, nickel sulfate, cobalt sulfate, indium sulfate, and iridium sulfate 1.03:0.8:0.1:0.01:0.01, mix lithium hydroxide, nickel sulfate, and cobalt sulfate evenly, and Add an appropriate amount of distilled water to the solid mixture, wherein the liquid-solid weight ratio of distilled water to the solid mixture is 1.1:1, ball mill and mix for 3 hours; then add water to dilute to obtain a slurry, wherein the liquid-solid weight ratio of the water in the slurry to the solid mixture is 8: 1; Distilled water is mixed with the indium source and the iridium source, and the liquid-solid weight ratio is 150:1.

[0039] Drying the slurry at a temperature of 200°C to obtain a precursor;

[0040] Pre-sintering the precursor to form a microporous structure, spraying the doping solution into the microporous structure through a high-pressure nozzle, and stirring the precursor while spraying;

[0041]...

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Abstract

The invention is applied to the field of lithium batteries, and provides a lithium nickel-cobalt-iron positive electrode material and a preparation method. The method comprises the steps that an indium-iridium-doped nickel-cobalt precursor is prepared and then subjected to mixed sintering with ferroferric oxide micropowder to obtain an indium-iridium-doped nickel-cobalt-iron positive electrode material, then the indium-iridium-doped nickel-cobalt-iron positive electrode material is mixed with a coating agent for secondary sintering, and finally the coating agent-coated lithium nickel-cobalt-iron positive electrode material is obtained. According to the positive electrode material, the crystal structure is stable, the coating layer is not prone to separate, and In<3+> and Ir<3+> are at constant valence in the charging and discharging process, are electrochemically inactive, do not generate valence state changes during charging and discharging or generate size changes, can achieve a skeleton effect and are beneficial to prolonging of the cycle life of the material and improvement of the security performance of the material.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a nickel-cobalt lithium ferrite positive electrode material and a preparation method thereof. Background technique [0002] Nickel-cobalt-manganese ternary cathode materials are widely used in 3C products and new energy vehicles due to their high energy density and low cost. However, due to the poor structural stability of pure nickel-cobalt-manganese oxide (LNCM), it is easy to collapse the material structure due to the deintercalation of Li ions and the change of the valence state of Ni, Co, and Mn ions during the charging and discharging process. The cycle life and safety will cause great harm. When the charging voltage is lower than 4.4V (relative to Li + / Li) process, it is generally believed that Ni ions will produce Ni 2+ / 3+ to Ni 4+ The transformation, and with the shrinkage of the volume, continue to charge, at a higher voltage, Co 3+ Participa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/36
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 许开华王星宁徐世国徐中领许国干李伟张玉军刘钰
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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