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Ultrahigh-nickel polycrystalline positive electrode material as well as preparation method and application thereof

A positive electrode material and ultra-high technology, applied in the field of ultra-high nickel polycrystalline positive electrode material and its preparation, can solve the problems of difficult to achieve industrialization, poor cycle performance, poor specific capacity, etc., to improve the discharge specific capacity, stabilize the structure, improve Effect of Rate Capability and Cycle Retention

Pending Publication Date: 2022-06-07
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The high-nickel cathode material provided by the above scheme has the problem of poor specific capacity or poor cycle performance, and it is difficult to realize industrialization. Therefore, it is necessary to develop an ultra-high nickel cathode material with good specific capacity and good cycle performance

Method used

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  • Ultrahigh-nickel polycrystalline positive electrode material as well as preparation method and application thereof
  • Ultrahigh-nickel polycrystalline positive electrode material as well as preparation method and application thereof
  • Ultrahigh-nickel polycrystalline positive electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides an ultra-high nickel polycrystalline positive electrode material, and the ultra-high nickel polycrystalline positive electrode material is prepared by the following method:

[0042] (1) Dry mixing nickel hydroxide, zirconia, tantalum pentoxide and lithium source in a molar ratio of 0.976:0.02:0.004:1.06, and after mixing uniformly, at 715 ° C, O 2 (purity 99.99%) atmosphere, after sintering for 12 hours, cooling and sieving to obtain a sintered material (Li 1.06 Ni 0.976Zr 0.02 Ta 0.004 O 2 );

[0043] (2) the primary sintered material obtained in step (1) and cobalt oxide are uniformly mixed according to the molar ratio of 1:0.008, and in 0 2 (purity 99.99%) atmosphere, heat treatment at 650℃ for 12h, cooling and sieving (400 mesh screen) to obtain cobalt-coated ultra-high nickel polycrystalline nickel zirconium lithium tantalate cathode material (Li 1.06 Ni 0.976 Zr 0.02 Ta 0.004 O 2 ﹒ (Co 2 O 3 ) 0.008 ).

[0044] The SEM image...

Embodiment 2

[0046] This embodiment provides an ultra-high nickel polycrystalline positive electrode material, and the ultra-high nickel polycrystalline positive electrode material is prepared by the following method:

[0047] (1) Dry mixing nickel hydroxide, zirconia, tantalum pentoxide and lithium source in a molar ratio of 0.988:0.01:0.003:1.06, and after mixing uniformly, at 715 ° C, O 2 (purity 99.99%) atmosphere, after sintering for 12 hours, cooling and sieving to obtain a sintered material (Li 1.06 Ni 0.988 Zr 0.01 Ta 0.003 O 2 );

[0048] (2) the primary sintered material obtained in step (1) and cobalt oxide are uniformly mixed according to the molar ratio of 1:0.008, and in 0 2 (purity 99.99%) atmosphere, heat treatment at 650℃ for 12h, cooling and sieving (400 mesh screen) to obtain cobalt-coated ultra-high nickel polycrystalline nickel zirconium lithium tantalate cathode material (Li 1.06 Ni 0.988 Zr 0.01 Ta 0.003 O 2 ﹒ (Co 2 O 3 ) 0.008 ).

Embodiment 3

[0050] This embodiment provides an ultra-high nickel polycrystalline positive electrode material, and the ultra-high nickel polycrystalline positive electrode material is prepared by the following method:

[0051] (1) Dry mixing nickel hydroxide, zirconium oxide, tantalum pentoxide and lithium source in a molar ratio of 0.965:0.03:0.005:1.06, and after mixing uniformly, at 715 ° C, O 2 (purity 99.99%) atmosphere, after sintering for 12 hours, cooling and sieving to obtain a sintered material (Li 1.06 Ni 0.965 Zr 0.03 Ta 0.005 O 2 );

[0052] (2) the primary sintered material obtained in step (1) and cobalt oxide are uniformly mixed according to the molar ratio of 1:0.008, and in 0 2 (purity 99.99%) atmosphere, heat treatment at 650℃ for 12h, cooling and sieving (400 mesh screen) to obtain cobalt-coated ultra-high nickel polycrystalline nickel zirconium lithium tantalate cathode material (Li 1.06 Ni 0.965 Zr 0.03 Ta 0.005 O 2 ﹒ (Co 2 O 3 ) 0.008 ).

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Abstract

The invention provides an ultrahigh nickel polycrystalline positive electrode material and a preparation method and application thereof.The ultrahigh nickel polycrystalline positive electrode material comprises an inner core and a coating layer arranged on the surface of the inner core, the chemical formula of the inner core is LixNiaZrbTacO2, x is larger than or equal to 1.01 and smaller than or equal to 1.08, a is larger than or equal to 0.950 and smaller than or equal to 0.990, b is larger than or equal to 0.01 and smaller than or equal to 0.04, c is larger than or equal to 0.002 and smaller than or equal to 0.006, a + b + c = 1, the coating layer is a cobalt oxide coating layer, and a is larger than or equal to 0 and smaller than or equal to 0. The ultrahigh nickel polycrystalline positive electrode material is doped with zirconium and tantalum, and by accurately controlling the particle size and the grain size of the material, the specific discharge capacity of the ultrahigh nickel polycrystalline positive electrode material can be obviously improved, and meanwhile, the cycle retention rate of the ultrahigh nickel polycrystalline positive electrode material can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an ultra-high nickel polycrystalline positive electrode material and a preparation method and application thereof. Background technique [0002] The high-nickel cathode material has the advantage of high capacity, which can improve the energy density of the cell, but with the increase of nickel content, the degree of mixing of lithium and nickel in the cathode material intensifies. The theoretical discharge specific capacity of pure lithium nickelate is 247mAh / g, but due to Its manufacturing conditions are harsh, such as Ni from the precursor 2+ Ni to LiNiO 3+ There is a large energy barrier, and lithium nickelate needs to be synthesized at high temperature (780 ~ 830℃), and lithium nickelate is easily decomposed at ≥720℃, resulting in the presence of Ni in the synthesized lithium nickelate 2+ , Ni 2+ The more lithium and nickel, the more serious the mixing of lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M10/0525C01G53/00
CPCH01M4/366H01M4/525H01M10/0525C01G53/42H01M2004/028C01P2004/03C01P2006/40Y02E60/10
Inventor 白艳张树涛李子郯王涛杨红新王壮王亚州
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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