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Quaternary positive electrode material and preparation method thereof

A positive electrode material, oxidation sintering technology, applied in the direction of chemical instruments and methods, electrical components, battery electrodes, etc., can solve the problem of easy agglomeration of positive electrode materials, achieve the effect of reducing production process, improving mass production, and reducing costs

Active Publication Date: 2021-06-25
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a quaternary positive electrode material and its preparation method to solve the problem that the positive electrode materials used in lithium ion batteries are easy to agglomerate in the prior art

Method used

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  • Quaternary positive electrode material and preparation method thereof
  • Quaternary positive electrode material and preparation method thereof
  • Quaternary positive electrode material and preparation method thereof

Examples

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preparation example Construction

[0031]In another typical embodiment of the present application, a method for preparing a quaternary positive electrode material is provided, the preparation method includes: step S1, including Ni a co b mn c Al (1-a-b-c) (OH) 2 , the optional first mixture of metal dopant oxide and LiOH is oxidized and sintered for the first time to obtain an intermediate product, 0.83 mixed to form a second mixture, and the second mixture was oxidized and sintered to obtain a quaternary cathode material, an intermediate product and WO 3 The mass ratio is 0.003-0.005:1, and the above-mentioned second oxidation sintering temperature is 250-650°C.

[0032] The above preparation method will first include Ni a co b mn c Al (1-a-b-c) (OH) 2 Oxidation and sintering with the first mixture of LiOH, the general chemical formula is LiNi a co b mn c Al (1-a-b-c) o 2 Intermediate products, and then include LiNi a co b mn c Al (1-a-b-c) o 2 and WO 3 Low-temperature oxidation and sinterin...

Embodiment 1

[0040] (1) Mix nickel-cobalt-manganese-aluminum hydroxide (molar ratio: Ni:Co:Mn:Al=83:8:6:3) with LiOH, ZrO 2 According to the mass ratio of 1:1.025:0.001, it is dry-mixed in the mixer, and the dry-mixed material is sintered in a box furnace at 850°C in an oxygen-containing gas atmosphere (oxygen content is 95%) for 8 hours, and then cooled , crushing and sieving to obtain Zr-doped nickel-cobalt-manganese-aluminum oxide, the average particle size of the Zr-doped nickel-cobalt-manganese-aluminum oxide is 3-5 μm.

[0041] (2) The nickel-cobalt-manganese-aluminum oxide doped with Zr and WO 3 According to the mass ratio of 1:0.003 for dry mixing, so that WO 3 The powder is uniformly attached to the surface of nickel-cobalt-manganese-aluminum oxide particles. After the dry mixed material is sintered in an oxygen-containing gas atmosphere (oxygen content is 50%) at 350 ° C for 8 hours, then cooled and sieved to obtain the general structure of Li 1 Ni 0.83 co 0.08 mn 0.06 Al ...

Embodiment 2

[0043] The difference from Example 1 is that the sintering temperature in (2) is 250°C.

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Abstract

The invention provides a quaternary positive electrode material and a preparation method thereof, wherein the structural general formula of the quaternary positive electrode material is LixNiaCobMncAl(1-a-b-c-d)MdWyO2, x is greater than or equal to 1 and less than 1.05, a is greater than 0.8 and less than 1, b is greater than 0 and less than 0.1, c is greater than 0 and less than 0.1, d is greater than or equal to 0.01 and less than or equal to 0.04, y is greater than or equal to 0.015 and less than or equal to 0.035, M is a dopant, and the W of the quaternary positive electrode material is dispersed on the surface of the quaternary positive electrode material. According to the invention, W is dispersed on the surface of a quaternary positive electrode material to effectively reduce the binding force among particles of the quaternary positive electrode material, so that the dispersity of the particles is further enhanced, agglomeration among the particles is reduced under the condition that the electrochemical performance of the quaternary positive electrode material is not reduced, the particle size of the quaternary positive electrode material cannot be increased due to agglomeration, the excellent sieving capacity is effectively guaranteed, the production process is reduced, the mass production is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a quaternary positive electrode material and a preparation method thereof. Background technique [0002] With the wide application of lithium-ion batteries in mobile phones, computers, automobiles, energy storage and other fields, people have higher and higher demands on the safety, energy density and cycle stability of batteries. The most representative of such batteries are lithium secondary batteries (LIBs) in which electrical energy is generated by changing the chemical potential of lithium ions in the positive and negative electrodes during intercalation and deintercalation. Cathode materials have a direct and dominant effect on the performance of LIBs, so many researchers are committed to realizing a cathode material with large capacity, fast charge / discharge speed, and long cycle life that can perform reversible intercalation and deinte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M4/485H01M4/628H01M10/0525C01G53/44C01P2004/03Y02E60/10
Inventor 王壮张树涛王亚州白艳马加力
Owner SVOLT ENERGY TECHNOLOGY CO LTD