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Lithium ion battery cathode material precursor, lithium ion battery cathode material, preparations methods of lithium ion battery cathode material precursor and lithium ion battery cathode material, and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, positive electrodes, etc., to achieve high-capacity characteristics and improved rate performance

Active Publication Date: 2019-11-08
当升科技(常州)新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of high capacity characteristics, rate performance, cycle performance and safety performance in the prior art, and to provide a lithium ion battery cathode material precursor and a preparation method thereof, a lithium ion battery Positive electrode material and preparation method thereof, and a lithium ion battery

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  • Lithium ion battery cathode material precursor, lithium ion battery cathode material, preparations methods of lithium ion battery cathode material precursor and lithium ion battery cathode material, and lithium ion battery
  • Lithium ion battery cathode material precursor, lithium ion battery cathode material, preparations methods of lithium ion battery cathode material precursor and lithium ion battery cathode material, and lithium ion battery
  • Lithium ion battery cathode material precursor, lithium ion battery cathode material, preparations methods of lithium ion battery cathode material precursor and lithium ion battery cathode material, and lithium ion battery

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Embodiment approach

[0037] According to a preferred embodiment of the present invention, in the structural formula of the cathode material precursor, 0.7≤x1<1, 0.7≤x2<1, 0<y1≤0.3, 0<y2≤0.3, 0<η1≤0.05, 0 <η2≤0.05, 0.4≤z≤0.5, and the value of 1-x1-y1-η1 is not 0, and the value of 1-x2-y2-η2 is not 0. When the Ni content in the positive electrode material precursor is relatively high, the positive electrode material prepared from the positive electrode material precursor still has relatively high safety performance.

[0038] In the present invention, D and G belong to the doping elements in the positive electrode material precursor, wherein the element D is selected from Mo, Ti, Y, W, Nb, Cr, Sm, V, La, Ca, Hf and Zr At least one of the element G is selected from at least one of Mo, Zn, Ti, Y, W, Nb, Cr, Sm, Al, V, La, Ca, Fe, Hf, Zr, Mg and B.

[0039] Element D and element G may be the same or different elements. Preferably, the types of element D and element G are different.

[0040] In the pr...

Embodiment 1

[0100] (1) Lithium-ion battery cathode material precursor T1

[0101] The structural formula of the cathode material precursor T1 for lithium-ion batteries is:

[0102] 0.40[(Ni 0.9 co 0.05 mn 0.04 Nb 0.01 )(OH) 2 ]·0.60[(Ni 0.8 co 0.05 mn 0.14 Zr 0.01 )(OH) 2 ],

[0103] The average molar ratio of metal ions in the inner core is Ni: Co: Mn: Nb = 0.90: 0.05: 0.04: 0.01, wherein the content of the doping element Nb decreases continuously along the direction from the core to the surface of the core, and the change rule is 0.02-0; at the same time The content of Mn element increases continuously along the direction from the core to the surface of the core, and the change rule is 0.03-0.05; and the total amount of doping elements Nb and Mn is kept at 0.05 during the change process, and the average particle size of the core part is 9 μm.

[0104] The average molar ratio of the metal ions in the outer shell is Ni: Co: Mn: Zr = 0.80: 0.05: 0.14: 0.01, wherein the content o...

Embodiment 2

[0122] (1) Lithium-ion battery cathode material precursor T2

[0123] Lithium-ion battery cathode material precursor T2 structural formula is:

[0124] 0.41[(Ni 0.8 co 0.05 mn 0.14 Nb 0.01 )(OH) 2 ]·0.59[(Ni 0.7 co 0.05 mn 0.24 Zr 0.01 )(OH) 2 ].

[0125] The average molar ratio of metal ions in the inner core is Ni: Co: Mn: Nb = 0.80: 0.05: 0.14: 0.01, wherein the content of the doping element Nb decreases continuously along the direction from the core to the surface of the core, and the change rule is 0.02-0; at the same time The content of Mn element increases along the direction from the core to the surface of the core, and the change rule is 0.13-0.15; and the total amount of doping elements Nb and Mn elements is maintained at 0.15 during the change process; the average particle size of the core part is 9 μm.

[0126] The average molar ratio of metal ions in the outer shell is Ni: Co: Mn: Zr = 0.70: 0.05: 0.24: 0.01, in which the content of the doping element Z...

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Abstract

The invention relates to the field of lithium ion batteries, and discloses a lithium ion battery cathode material precursor, a lithium ion battery cathode material, preparations methods of the lithiumion battery cathode material precursor and the lithium ion battery cathode material, and a lithium ion battery. The structural formula of the precursor is z[(Ni<x1>Co<y1>Mn<1-x1-y1-eta1>D<eta1>)(OH)2].(1-z)[(Ni<x2>Co<y2>Mn<1-x2-y2-eta2>G<eta2>)(OH)2], wherein x1 is greater than or equal to 0.6 and less than 1, x2 is greater than or equal to 0.6 and less than 1, y1 is greater than 0 and less thanor equal to 0.4, y2 is greater than 0 and less than or equal to 0.4, eta1 is greater than 0 and less than or equal to 0.1, eta2 is greater than 0 and less than or equal to 0.1, and z is greater than 0and less than 1. By controlling the gradient change of the doping element D and G at the inner core part and the outer core part of the precursor, a material with a stable crystal phase structure isobtained, and the cycle life of the lithium ion battery cathode material can be effectively prolonged and the stability of the lithium ion battery cathode material can be effectively improved on the basis of maintaining the high capacity characteristic and rate performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery cathode material precursor and a preparation method thereof, a lithium ion battery cathode material and a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, electric vehicles are developing rapidly, and the country has shifted from vigorously supporting and restricting this development direction to leaving it to market competition. As a key component of electric vehicles, batteries are facing huge challenges. Cathode materials that restrict the performance and safety of batteries in all aspects need to be studied intensively. Commercial lithium-ion battery cathode material LiNi x co y mn 1-x-y o 2 The reversible capacity of the material increases with the increase of Ni element content in the material, and then the safety performance decreases. That is, when the Ni content is increased to x=0.80, the rev...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/03C01P2006/40H01M4/362H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 王竞鹏于振兴张学全刘亚飞陈彦彬李建忠
Owner 当升科技(常州)新材料有限公司
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