Lithium nickel cobalt manganese oxide high-nickel single-crystal positive electrode material and preparation method thereof

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high capacity, large size and high dispersion, and achieve the effect of enhanced conductivity and high capacity

Pending Publication Date: 2022-05-06
GEM WUXI ENERGY MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, propose a nickel-cobalt lithium manganese oxide high-nickel single-crystal positive electrode material and its preparation method, and solve the problem that high-nickel single-crystal positive electrode materials in the prior art are difficult to balance high capacity, large size and high dispersion technical issues

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  • Lithium nickel cobalt manganese oxide high-nickel single-crystal positive electrode material and preparation method thereof
  • Lithium nickel cobalt manganese oxide high-nickel single-crystal positive electrode material and preparation method thereof
  • Lithium nickel cobalt manganese oxide high-nickel single-crystal positive electrode material and preparation method thereof

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preparation example Construction

[0019] The first aspect of the present invention provides a method for preparing nickel-cobalt lithium manganate high-nickel single crystal positive electrode material, comprising the following steps:

[0020] S1. Mix and ball-mill nickel-cobalt-manganese hydroxide with lithium source, zirconia, tungsten oxide, and sodium carbonate, and then sinter once to obtain a nickel-cobalt lithium manganese oxide high-nickel single-crystal positive electrode material intermediate after crushing; wherein, once The sintering temperature is 50-150°C higher than the normal sintering temperature;

[0021] S2. Uniformly mixing the nickel-cobalt lithium manganese oxide high-nickel single-crystal positive electrode material intermediate with the coating agent, followed by secondary sintering to obtain nickel-cobalt lithium manganate high-nickel single-crystal positive electrode material.

[0022] In the present invention, tungsten oxide and sodium carbonate are introduced as dopants in a sinteri...

Embodiment 1

[0032] (1) Weigh 2.0kg Ni 0.80 co 0.10 mn 0.10 (OH) 2 Powder, 0.93kg LiOH·H 2 O, 5.78g nano ZrO 2 , 8.10g WO 3 After mixing evenly with 4.95g of sodium carbonate in a ball mill mixer, put the mixture in an oxygen atmosphere furnace for calcination, the calcination temperature is 950°C, and the sintering time is 15h. After the reaction is completed, it is cooled, pulverized, and sieved to obtain nickel Lithium cobalt manganese oxide high nickel single crystal cathode material intermediate;

[0033] (2) 4.65g Y 2 o 3 After being uniformly mixed with the nickel-cobalt lithium manganese oxide high-nickel single crystal positive electrode material intermediate, heat treatment at 500° C. for 10 h in a high oxygen atmosphere to obtain the yttrium-coated nickel-cobalt lithium manganate high nickel single crystal positive electrode material.

Embodiment 2

[0035] (1) Weigh 2.0kg Ni 0.80 co 0.10 mn 0.10 (OH) 2 Powder, 0.93kg LiOH·H 2 O, 5.78g nano ZrO 2 , 8.10g WO 3 After mixing evenly with 4.95g of sodium carbonate in a ball mill mixer, put the mixture in an oxygen atmosphere furnace for calcination, the calcination temperature is 930°C, and the sintering time is 20h. After the reaction is completed, it is cooled, crushed, and sieved to obtain nickel Lithium cobalt manganese oxide high nickel single crystal cathode material intermediate;

[0036] (2) 4.65g Y 2 o 3 After being uniformly mixed with the nickel-cobalt lithium manganese oxide high-nickel single crystal positive electrode material intermediate, heat treatment at 500° C. for 10 h in a high oxygen atmosphere to obtain the yttrium-coated nickel-cobalt lithium manganate high nickel single crystal positive electrode material.

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Abstract

The invention discloses a lithium nickel cobalt manganese oxide high-nickel single-crystal positive electrode material and a preparation method thereof. The preparation method comprises the following steps: mixing and ball-milling nickel cobalt manganese hydroxide, a lithium source, zirconium oxide, tungsten oxide and sodium carbonate, then carrying out primary sintering, and crushing to obtain a nickel cobalt lithium manganate high-nickel single-crystal positive electrode material intermediate; wherein the primary sintering temperature is 50-150 DEG C higher than the normal sintering temperature; and uniformly mixing the nickel cobalt lithium manganate high-nickel single-crystal positive electrode material intermediate with a coating agent, and then carrying out secondary sintering to obtain the nickel cobalt lithium manganate high-nickel single-crystal positive electrode material. Tungsten oxide and sodium carbonate are introduced in the primary sintering process, the electrical conductivity of the material can be enhanced, the particle morphology can be changed, primary particles are refined, the characteristic that tungsten oxide and sodium carbonate are combined is utilized, zirconium oxide doping is combined, and at the high primary sintering temperature, the conductivity of the material is improved, and the conductivity of the material is improved. And the high-nickel single-crystal positive electrode material with high capacity, high dispersity and excellent cycle performance is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a nickel-cobalt lithium manganese oxide high-nickel single-crystal positive electrode material and a preparation method thereof. Background technique [0002] LiNi x co y mn 1-x-y o 2 Ternary cathode materials have been widely used in lithium-ion secondary batteries because of their high specific capacity and energy density, low cost and relative environmental friendliness, especially in the current context, their use in automotive power batteries The market has broad room for development. With the improvement of cruising range, the current cathode materials are gradually developing in the direction of high nickel and high voltage. Single crystal cathode materials have attracted much attention due to their advantages of relatively high plate compaction and less gas production. However, there are two problems in the sintering process of high-nickel single crystal m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525
CPCH01M4/48H01M4/364H01M4/505H01M4/525Y02E60/10
Inventor 许开华李伟刘德宠谢军廖宁靖施杨周晓燕陈玉君徐世国
Owner GEM WUXI ENERGY MATERIAL CO LTD
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