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High nickel lithium-rich cathode material, and preparation method and use thereof

A lithium-rich positive electrode material, high nickel technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the performance requirements of excellent lithium-ion battery positive electrode materials, electrochemical performance needs to be improved, preparation and improvement In order to achieve the effect of improving electrochemical performance, excellent electrochemical performance and short preparation cycle

Inactive Publication Date: 2019-06-21
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, high-nickel lithium-rich materials (Ni has a relatively high content in transition metals) with higher discharge voltage and better cycle stability are a new generation of cathode materials with broad application prospects, but the obtained materials The electrochemical performance needs to be improved, and it cannot meet the performance requirements of excellent lithium-ion battery cathode materials
[0006] At present, whether it is from the perspective of basic or applied research, manganese-rich materials are still focused on lithium-rich systems, while high-nickel lithium-rich materials have not received enough attention, and there are few related research reports. The corresponding preparation and modification developed technology is seriously lacking

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  • High nickel lithium-rich cathode material, and preparation method and use thereof
  • High nickel lithium-rich cathode material, and preparation method and use thereof
  • High nickel lithium-rich cathode material, and preparation method and use thereof

Examples

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Embodiment 1

[0069] A chemical formula is Li 1.2 Ni 0.4 mn 0.4 o 2 The preparation method of the high-nickel lithium-rich cathode material comprises the steps:

[0070] (1) Mix 0.012mol of manganese nitrate, 0.015mol of citric acid, 0.036mol of lithium nitrate and 0.012mol of nickel nitrate with 120ml of deionized water to obtain a mixed solution, and dry the mixed solution in a water bath at 80°C to obtain a dry gel glue;

[0071] (2) Heating the dry gel at 200° C. for 5 hours to obtain a decomposition product, grinding the decomposition product into powder, sintering at 500° C. for 3.5 hours, and then sintering at 840° C. for 9 hours to obtain a high-nickel lithium-rich cathode material.

[0072] figure 1 It is the XRD pattern of the high-nickel-rich lithium-rich cathode material. It can be seen from the figure that the high-nickel-rich lithium-rich cathode material has a relatively obvious superlattice peak in the range of 20-25 degrees, and the superlattice peak comes from the ins...

Embodiment 2

[0075] The difference with Example 1 is that in step (1), 0.012mol manganese nitrate is replaced with 0.0108mol manganese nitrate and 0.0012 / 7mol tetrahydrate ammonium molybdate, and the chemical formula is Li 1.2 Ni 0.4 mn 0.36 Mo 0.04 o 2 high-nickel lithium-rich cathode material.

[0076] image 3 is the SEM image of the high-nickel-rich lithium-rich cathode material. It can be seen from the figure that, compared with Example 1, the particle size of the primary particle of the high-nickel-rich lithium-rich cathode material obtained after doping molybdenum is significantly reduced, and the primary particle The reduction of particle size can shorten the diffusion path of lithium ions, and at the same time provide more reactive sites on the surface of material particles, which helps to improve the rate performance of materials.

Embodiment 3

[0078] The difference with Example 2 is that ammonium molybdate tetrahydrate is replaced by ammonium tungstate hydrate of equal stoichiometry, and the chemical formula is Li 1.2 Ni 0.4 mn 0.36 W 0.04 o 2 high-nickel lithium-rich cathode material.

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Abstract

The invention relates to a high nickel lithium-rich cathode material having a chemical formula of Li1+z(Ni0.5+xMn0.5-x-yMy)1-zO2 or Li1+z(Ni0.5+x-yMn0.5-xMy)1-zO2, wherein the M is a VIB transition metal element, x is greater than or equal to 1 and less than 0.4, y is greater than or equal to 0 and less than or equal to 0.1, and z is greater than 0.0 and less than 0.3. The content of nickel in thehigh nickel lithium-rich cathode material provided by the invention is significantly higher than that in the typical lithium-rich manganese-based material, which can effectively solve the current problems such as poor ratio as well as cycle performance and voltage decay existing in the manganese-rich lithium-rich cathode material. At the same time, the high nickel lithium-rich cathode material isdoped with VIB transition metal elements, particularly a molybdenum element and a tungsten element source, which can impart more excellent electrochemical performance to the high nickel lithium-richcathode material.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a high-nickel lithium-rich cathode material, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have developed very rapidly in recent years, gradually occupying a dominant position in many types of secondary power sources. With the popularization of new energy vehicles and the rapid development of large-scale energy storage power stations, it is particularly urgent to develop secondary batteries with higher energy density. Compared with negative electrodes, the energy density of current conventional cathode materials is generally low, which has become a major bottleneck in the realization of high energy density batteries. [0003] In recent years, lithium-rich layered oxides Li 1+x m 1-x o 2 (M stands for transition metal, such as Mn, Ni or Co, etc.) has attracted much attention due to its high capacity and high energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525H01M4/36
CPCY02E60/10
Inventor 褚卫国郭利民王汉夫
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA