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Spherical lithium iron phosphate coated lithium nickelate-cobaltate-manganate battery material and preparation method

A technology of nickel cobalt lithium manganate and lithium iron phosphate, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor thermal stability and high rate stability, and achieves improved compaction density, low cost, and improved Effect of charge-discharge capacity and structural stability

Inactive Publication Date: 2019-02-19
CHENDU NEW KELI CHEM SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at defects such as poor thermal stability and poor high-rate stability of the currently widely used nickel-cobalt-lithium-manganese-oxide ternary material, the present invention proposes a spherical lithium iron phosphate-coated nickel-cobalt-lithium manganate battery material and a preparation method, thereby effectively The charge and discharge capacity and structural stability of the battery material are improved, and the high rate stability is enhanced

Method used

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  • Spherical lithium iron phosphate coated lithium nickelate-cobaltate-manganate battery material and preparation method

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Effect test

Embodiment 1

[0034] The preparation process is:

[0035] (1) Add nickel sulfate, cobalt sulfate, manganese sulfate and potassium permanganate into deionized water and fully dissolve to obtain a mixed solution; in the mixed solution, the molar ratio of nickel sulfate, cobalt sulfate, manganese sulfate and potassium permanganate for n (NiSO 4 ): n (CoSO 4 ):n(MnSO 4 ):n(KMnO 4 )=5:5:2:3, the mass concentration of the mixed solution is 32%;

[0036](2) Dissolve lithium hydroxide in deionized water to prepare a solution with a mass concentration of 15%, and then add it dropwise to the mixed solution prepared in step (1), and add porous carbon nanospheres, and stir for 15 minutes to obtain a suspension Turbid liquid; in the suspension, 58 parts by weight of mixed solution, 5 parts by weight of lithium hydroxide, 13 parts by weight of deionized water, and 26 parts by weight of porous carbon nanospheres;

[0037] (3) Transfer the suspension prepared in step (2) to a microwave reactor, and co...

Embodiment 2

[0046] The preparation process is:

[0047] (1) Add nickel sulfate, cobalt sulfate, manganese sulfate and potassium permanganate into deionized water and fully dissolve to obtain a mixed solution; in the mixed solution, the molar ratio of nickel sulfate, cobalt sulfate, manganese sulfate and potassium permanganate for n (NiSO 4 ): n (CoSO 4 ):n(MnSO 4 ):n(KMnO 4 )=5:5:2:3, the mass concentration of the mixed solution is 37%;

[0048] (2) Dissolve lithium hydroxide in deionized water to make a solution with a mass concentration of 12%, and then add it dropwise to the mixed solution prepared in step (1), and add porous carbon nanospheres, and stir for 10-30 minutes to prepare Obtain the suspension; in the suspension, 51 parts by weight of the mixed solution, 6 parts by weight of lithium hydroxide, 14 parts by weight of deionized water, and 29 parts by weight of porous carbon nanospheres;

[0049] (3) Transfer the suspension prepared in step (2) to a microwave reactor, and c...

Embodiment 3

[0058] The preparation process is:

[0059] (1) Add nickel sulfate, cobalt sulfate, manganese sulfate and potassium permanganate into deionized water and fully dissolve to obtain a mixed solution; in the mixed solution, the molar ratio of nickel sulfate, cobalt sulfate, manganese sulfate and potassium permanganate for n (NiSO 4 ): n (CoSO 4 ):n(MnSO 4 ):n(KMnO 4 )=5:5:2:3, the mass concentration of the mixed solution is 34%;

[0060] (2) Dissolve lithium hydroxide in deionized water to make a solution with a mass concentration of 20%, and then add it dropwise to the mixed solution prepared in step (1), and add porous carbon nanospheres, and stir for 18 minutes to obtain a suspension Turbid liquid; in the suspension, 571 parts by weight of mixed solution, 5 parts by weight of lithium hydroxide, 13 parts by weight of deionized water, and 27 parts by weight of porous carbon nanospheres;

[0061] (3) Transfer the suspension prepared in step (2) to a microwave reactor, and con...

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Abstract

The invention provides a spherical lithium iron phosphate coated lithium nickelate-cobaltate-manganate battery material and a preparation method. Nickel sulfate, cobalt sulfate, manganese sulfate, potassium permanganate, lithium hydroxide and porous carbon nanospheres are added into deionized water in sequence, a lithium nickelate-cobaltate-manganate precursor is obtained after the reaction, thenwet gel obtained after a lithium source, an iron source, a phosphorus source and a chelating agent are added into water is added, high-temperature sintering is carried out after spray drying is completed, and the spherical lithium iron phosphate coated lithium nickelate-cobaltate-manganate battery material is obtained. By means of the method, the charge and discharge capacity and the structural stability of a positive electrode material are improved, the electrochemical capacity of the material is improved, the sizes of single-crystal particles in material particles are increased, the densityof the particles is improved, the firm micro structure change of the particle materials with uniform granularity and good sphericity is formed, the compaction density of a lithium nickelate-cobaltate-manganate ternary material is improved, the high-magnification stability is enhanced, meanwhile,, the preparation flow is simple, the production period is short, the raw material source is wide, and the cost is low.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to the preparation of high-nickel ternary materials, in particular to a spherical lithium iron phosphate-coated nickel-cobalt lithium manganate battery material and a preparation method. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific capacity, high working voltage, low self-discharge rate, long cycle life, no memory effect, no pollution, light weight, and good safety performance, so they are widely used in mobile phones, digital cameras, and notebook computers and other mobile devices. With the development of science and technology, most products tend to be portable and economical, which requires lithium-ion battery products to develop in the direction of high energy density. [0003] At present, lithium cobalt oxide, which is widely used, has disadvantages such as resource shortage and high price, and the space for further improv...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 陈庆文奇曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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