A Ni-Co lithium manganate cathode material and a preparation method thereof

A technology of nickel-cobalt lithium manganate and cathode material, which is applied in the preparation of the nickel-cobalt lithium manganate cathode material and the field of nickel-cobalt lithium manganate cathode material, can solve the problems of poor cycle stability, poor high-rate capacity performance, etc. The effect of improving the specific capacity of charge and discharge, shortening the diffusion time, and fully compatible with industrial technologies

Active Publication Date: 2018-12-11
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a nickel-cobalt lithium manganese oxide positive electrode material, which solves the problems of poor high rate capacity performance and poor cycle stability of existing ternary material lithium batteries

Method used

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  • A Ni-Co lithium manganate cathode material and a preparation method thereof
  • A Ni-Co lithium manganate cathode material and a preparation method thereof
  • A Ni-Co lithium manganate cathode material and a preparation method thereof

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preparation example Construction

[0045] The preparation method of the above-mentioned nickel-cobalt lithium manganese oxide positive electrode material is specifically implemented according to the following steps:

[0046] Step 1, dispersing lanthanum nickelate nanocrystals in a dispersion solvent, and forming a highly dispersed suspension system of lanthanum nickelate nanocrystals by ultrasonic dispersion or high-energy stirring;

[0047] Among them, the size of lanthanum nickelate nanocrystals is 30nm-80nm, and the shape is granular or fibrous; it can be prepared by atomization thermal decomposition, CVD, sputtering deposition, high-energy ball milling, etc. Lanthanum nickelate nanocrystalline products.

[0048] The specific process of preparing lanthanum nickelate nanocrystals by atomization thermal decomposition method is as follows:

[0049] Weigh nickel acetate, lanthanum nitrate, and citric acid with a molar ratio of 1:1:1 and dissolve them in deionized water to obtain a solution with a mass concentra...

Embodiment 1

[0060] Step 1. Weigh nickel acetate, lanthanum nitrate, and citric acid with a molar ratio of 1:1:1 and dissolve them in deionized water to obtain a solution with a mass concentration of 5%. The atomized solution was transported to a tube furnace at 750°C at an average speed of 0.5cm / sec under air carrier gas, and the reaction product was collected in a collection filter at the end of the tube lumen to obtain lanthanum nickelate nanocrystals. Its SEM photos are as figure 2 As shown; using an ultrasonic reactor to disperse lanthanum nickelate nanocrystals in a mixed solvent of deionized water and ethylene glycol (deionized water: ethylene glycol mass ratio = 1:1), the formation of nickel acid with a mass concentration of 5% Highly dispersed suspension system of lanthanum nanocrystals;

[0061] Step 2. Mix the highly dispersed suspension system prepared in step 1 with the nickel-cobalt lithium manganate precursor powder (the nickel-cobalt lithium manganate precursor powder is ...

Embodiment 2

[0065] Step 1, using commercially available lanthanum nickelate nanocrystals (particle size is 30nm ~ 80nm), and using an ultrasonic reactor to disperse it in ethylene glycol to form a high dispersion of lanthanum nickelate nanocrystals with a mass concentration of 10% suspension system;

[0066] Step 2. Mix the highly dispersed suspension system prepared in step 1 with the nickel-cobalt lithium manganate precursor powder (the nickel-cobalt lithium manganese oxide precursor powder is made by mixing lithium carbonate, nickel oxide, cobalt carbonate, and manganese sulfate, and Ratio, Lithium Carbonate: Nickel Oxide: Cobalt Carbonate: Manganese Sulfate=1:0.6:0.2:0.2) Carry out ball milling and mixing in n-hexane, after mixing evenly, a mixed powder is obtained. In the mixed powder, lanthanum nickelate nanocrystals and The mass ratio of the nickel-cobalt-lithium-manganese-oxide precursor powder is 10%, and the mixed powder is sequentially dried and compacted under a pressure of 20...

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Abstract

A Ni-Co lithium manganate material is disclosed. The Ni-Co lithium manganate is prepare by taking lanthanum nickel oxide nanocrystal as heterogeneous crystalline core, A layer of lithium nickel cobaltmanganate grain is attached to that lanthanum nickel oxide nanocrystal, forming a lithium nickel cobalt manganate micron crystal cluster powder with lanthanum nickelate as the core, the problems of poor high rate capacity performance and poor cycle stability of the existing ternary material lithium batteries are solved, The preparation method of the invention provides a crystalline core of the lithium nickel cobalt manganate through a preset nanocrystalline core, forms lithium nickel cobalt manganate cluster particles with a lanthanum nickel oxide skeleton, provides an internal conductive channel, is conducive to improving and exerting the charge-discharge specific capacity of the lithium nickel cobalt manganate ternary battery, and is simple and feasible.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a nickel-cobalt lithium manganese oxide cathode material, and also relates to a preparation method of the nickel-cobalt lithium manganese oxide cathode material. Background technique [0002] At the time when resources are scarce and the energy crisis is becoming more and more serious, with the continuous progress of society, industry and science and technology, the emergence of new energy products has greatly changed the original way of energy use. Lithium-ion batteries are considered to be the most ideal electrochemical energy sources because of their advantages such as high energy density, high working voltage, good cycle performance, and low self-discharge rate. Among them, the positive electrode material is one of the most important components in the lithium ion battery as the lithium source in the lithium ion battery. At present, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张卫华游才印霍文洪繁郭少华
Owner XIAN UNIV OF TECH
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