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Multi-element mixed doping coating modified ternary positive electrode material and preparation method thereof

A technology of positive electrode materials and ternary materials, which is applied in the field of multi-element mixed doping coating modified ternary positive electrode materials and its preparation, can solve lattice deformities, and it is difficult to ensure that the performance of ternary positive electrode materials is greatly improved or improved, etc. problems, to achieve good lattice structure, enhance electrochemical performance, and expand channels

Inactive Publication Date: 2019-01-11
圣戈莱(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above method, the single introduction of one kind of ion, or the introduction of multiple ions with similar ionic radii, leads to a disproportionate change in the unit cell parameters of the ternary positive electrode material, resulting in lattice deformity, and it is difficult to ensure the performance of the ternary positive electrode material. greatly improved or enhanced

Method used

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  • Multi-element mixed doping coating modified ternary positive electrode material and preparation method thereof
  • Multi-element mixed doping coating modified ternary positive electrode material and preparation method thereof
  • Multi-element mixed doping coating modified ternary positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0027] This embodiment prepares Nb 5+ with Al 3+ Co-doped, ZrO 2 The ternary cathode material of coating modification comprises the following steps:

[0028] (1) Weigh 9.9mol of Ni 0.8 co 0.1 mn 0.1 (OH) 2 , 10.4 mol of lithium hydroxide, 0.05 mol of niobium oxalate hexahydrate, and 0.025 mol of aluminum sulfate octadecahydrate were placed in a high-speed mixer and fully mixed to obtain a uniform mixture A.

[0029] (2) Put the mixture A prepared in step (1) in a high-temperature sintering furnace, raise the temperature to 760°C at a heating rate of 3°C / min in an oxidizing atmosphere and keep it for 20 hours, then stop heating. After natural cooling and crushing, the primary sintered product B is obtained.

[0030] (3) Weigh 0.05 mol of zirconium acetate, add 1 liter of ethanol, stir and mix thoroughly, then add the mixture to the primary sintered product B prepared in step (2), heat to 60°C, and use a high-speed stirrer to stir continuously, Until the solvent was evap...

Embodiment 2

[0039] This embodiment prepares Sn 4+ with V 5+ Co-doped, Al 2 o 3 The coated ternary cathode material comprises the steps of:

[0040] (1) Weigh 0.02mol of SnCl4, 0.02mol of ammonium metavanadate, add 1 liter of water, fully stir and dissolve; then weigh 9.96mol of Ni 0.6 co 0.2 mn 0.2 (OH) 2 . 5.15 mol of lithium carbonate was put into the suspension, heated to 90° C., and stirred continuously with a high-speed stirrer until the solvent was evaporated to dryness, and a homogeneous mixture A was obtained.

[0041] (2) Place the mixture A prepared in step (1) in a high-temperature sintering furnace, raise the temperature to 880°C at a heating rate of 2°C / min in an oxidizing atmosphere and keep it for 20 hours, then stop heating. After natural cooling and crushing, the primary sintered product B is obtained.

[0042] (3) Weigh 0.025mol of alumina, add 1 liter of ethanol, stir and mix thoroughly, then add the mixture to the primary sintered product B prepared in step (2)...

Embodiment 3

[0047] This embodiment prepares Mg 2+ 、Sc 3+ with Al 3+ 、Ti 4+ A co-doped, boron oxide-coated ternary cathode material, comprising the following steps:

[0048] (1) Weigh 9.9mol of Ni 0.6 co 0.2 mn 0.2 CO 3 , 5.20mol of lithium carbonate, 0.025mol of magnesium hydroxide, 0.025mol of scandium hydroxide, 0.0125mol of aluminum oxide, 0.025mol of TiO 2 , placed in a high-speed mixer, fully mixed to obtain a homogeneous mixture A.

[0049] (2) Put the mixture A prepared in step (1) in a high-temperature sintering furnace, raise the temperature to 900°C and keep it for 15h under an oxidizing atmosphere at a heating rate of 2°C / min, and then stop heating. After natural cooling and crushing, the primary sintered product B is obtained.

[0050] (3) Weigh 0.025 mol of diboron trioxide, add it to 1 liter of ethanol, stir and mix thoroughly, then add the mixture to the primary sintered product B prepared in step (2), heat to 60°C, and use a high-speed stirrer to Stir intermitten...

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Abstract

The invention discloses a multi-element mixed doping and coating modified ternary positive electrode material and a preparation method thereof. According to the lattice structure characteristics of ternary positive electrode materials, two kinds of metal ions with different ionic radii are doped selectively by multi-element mixed doping method. One kind of metal ions with lithium ion radius equalto or close to lithium ion radius can reduce the cation mixing and discharging. The other kind of metal ions with the same or close radius as transition metal ions (Mn4 +, Co3 +) can reduce the polarization and enhance the electrochemical performance. At that same time, a protective layer is coated on the surface of the ternary positive electrode material by a secondary sinter process to prevent the dissolution of transition metal ions on the surface of the ternary positive electrode material, thereby the ternary positive electrode material with excellent rate performance and cycling performance is prepare. The method is simple in process, convenient in operation and good in reproducibility, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrode materials, and in particular relates to a multi-element mixed doping coating modified ternary positive electrode material and a preparation method thereof. Background technique [0002] The layered lithium-nickel-cobalt-manganese-oxygen ternary cathode material (hereinafter referred to as "ternary cathode material" or "NCM") better combines the advantages of lithium cobaltate, lithium nickelate, and lithium manganate, and the ternary synergistic effect makes it The overall performance is better than any one-component compound, so it has the advantages of high specific capacity, stable cycle performance, relatively low cost, and good safety performance. It has been widely used in various electronic products and new energy vehicles and other fields. [0003] In ternary cathode materials, there are five cations with different valence states and radii: Li + (radius: ), Ni 2+ ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 闫东伟吴志坚冯一涛刘伟谷丰宏
Owner 圣戈莱(北京)科技有限公司
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