Modified lithium nickel cobalt manganese oxide ternary positive electrode material and preparation method and application thereof

A technology of nickel-cobalt lithium manganese oxide and ternary materials, which is applied in the direction of positive electrodes, active material electrodes, electrical components, etc., can solve the problems of low capacity of ternary positive electrode materials, reduce the formation of SEI), stabilize performance, and alleviate Effects of excess lithium

Active Publication Date: 2020-07-17
桂林麦克斯新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a modified nickel-cobalt lithium manganate ternary

Method used

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  • Modified lithium nickel cobalt manganese oxide ternary positive electrode material and preparation method and application thereof
  • Modified lithium nickel cobalt manganese oxide ternary positive electrode material and preparation method and application thereof
  • Modified lithium nickel cobalt manganese oxide ternary positive electrode material and preparation method and application thereof

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preparation example Construction

[0022] On the one hand, an embodiment of the present invention provides a method for preparing a modified nickel-cobalt-lithium manganese oxide ternary positive electrode material. The preparation method of the modified nickel-cobalt lithium manganese oxide ternary positive electrode material comprises the following steps:

[0023] Step S01: preparing a nickel-cobalt-lithium manganese oxide ternary material, the particles of which are braided spherical;

[0024] Step S02: The powder of the nickel-cobalt-lithium-manganese-oxide ternary material is mixed with the mixture of rare earth nitride and lithium-nitrogen in a mass ratio of 1:(0.05-0.3):(0.01-0.1) for the first ball milling process , to obtain the mixture powder;

[0025] Step S03: The mixture powder is sintered in stages under a nitrogen-oxygen mixed atmosphere.

[0026] Wherein, in step S01, the particles of the nickel-cobalt-lithium-manganese-oxide ternary material are braided spherical, specifically as figure 1 wi...

Embodiment 1

[0041] This example provides a modified nickel-cobalt lithium manganate ternary positive electrode material and a preparation method thereof. The modified nickel-cobalt lithium manganese oxide ternary positive electrode material is prepared according to a method comprising the following steps:

[0042] (1) Preparation of nickel-cobalt-manganese ternary cathode material with braided ball structure:

[0043] Dissolve nickel nitrate, cobalt nitrate, and manganese nitrate in an amount of 6:2:2 in absolute ethanol, and add 500ml of NH 4 OH solution, the pH value is controlled at 11, the reaction temperature is 45°C, and the stirring rate is 750r / min. After 12 hours of reaction, filter, wash, dry at 55°C for 14 hours, and grind to obtain a nickel-cobalt-manganese ternary precursor with a braided ball structure; The precursor of the above braided ball structure is mixed with lithium carbonate at a ratio of 1:1.08. After mixing and grinding, it is pre-fired at 450°C for 5 hours in an...

Embodiment 2

[0047] This example provides a modified nickel-cobalt lithium manganate ternary positive electrode material and a preparation method thereof. The modified nickel-cobalt lithium manganese oxide ternary positive electrode material is prepared according to a method comprising the following steps:

[0048] (1) Preparation of nickel-cobalt-manganese ternary positive electrode material with braided ball structure: as in step (1) of Example 1;

[0049] (2) Preparation of NCM622 coated with a mixture of zirconium nitride and lithium nitrogen:

[0050] Weigh zirconia and carbonamide at a ratio of 1:0.1, ball mill at a rate of 300r / min for 50min, and heat up to 550°C for 2h at a rate of 5°C / min in a nitrogen atmosphere to obtain powder 1; lithium carbonate and carbon The amide was weighed at a ratio of 1:0.08, heated to 650°C for 2 hours at a heating rate of 5°C / min in a nitrogen atmosphere, and ball milled at a rate of 300r / min for 50 minutes to obtain powder 2; mix NCM622 with powder...

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Abstract

The invention provides a modified nickel cobalt lithium manganate ternary positive electrode material as well as a preparation method and application thereof. The preparation method of the modified nickel cobalt lithium manganate ternary cathode material comprises the following steps of preparing a braided spherical nickel cobalt lithium manganate ternary material; carrying out first ball-millingmixing treatment on the nickel cobalt lithium manganate ternary material powder and a rare earth nitride and lithium nitrogen mixture to obtain mixture powder; and carrying out segmented sintering treatment on the mixture powder in a nitrogen-oxygen mixed atmosphere. According to the preparation method of the modified lithium nickel cobalt manganese oxide ternary positive electrode material, the ternary material particles are coated with the rare earth nitride and lithium nitrogen mixture, so that the capacity exertion and the cycle retention rate of the ternary material are effectively improved, the nitridation effect of the ternary material is improved, and the lithium-nickel mixed arrangement of the material and the redundant lithium on the surface of the material are better relieved. Meanwhile, the nitride coating layer reduces and prevents the contact between the electrolyte and the active material, reduces the irreversible side reaction, and reduces the formation of a solid electrolyte membrane (SEI).

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a modified nickel-cobalt-lithium manganese oxide ternary positive electrode material and a preparation method and application thereof. Background technique [0002] With the continuous advancement of my country's industrialization and urbanization, the environmental crisis and the contradiction between energy supply and demand have gradually intensified. Therefore, the new energy vehicle industry has developed rapidly, and lithium-ion batteries have become the best choice for new energy vehicle power sources due to their high energy density, long cycle life, and good safety performance. At present, commonly used lithium-ion cathode materials include lithium iron phosphate, lithium manganese oxide, nickel-cobalt lithium manganese oxide, and the like. [0003] Since Volkswagen generally has higher requirements on the cruising range of vehicles, the power...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 俞兆喆杨平程燕
Owner 桂林麦克斯新能源科技有限公司
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