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Chromium-doped nickel-cobalt-manganese-lithium ion battery cathode material and preparation method thereof

A nickel-cobalt-manganese-lithium, ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problem of uneven mixing of doping elements and main elements, and achieve mechanical strength. High, improved mixing effect, easy to incorporate

Inactive Publication Date: 2018-03-06
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the objectives of the present invention is to provide a chromium-doped nickel-cobalt-manganese lithium-ion battery positive electrode material, and the second objective of the present invention is to provide a preparation method for the positive electrode material to solve the problem of mixing dopant elements and main elements in the prior art uneven problem

Method used

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preparation example Construction

[0024] A preparation method of the above-mentioned chromium-doped nickel-cobalt-manganese lithium-ion battery positive electrode material, which comprises the following steps:

[0025] Step 1. Weigh the nickel-cobalt-manganese polycrystalline composite precursor, the nickel-cobalt-manganese single-crystal composite precursor, the nano-chromium source and the lithium source; the nickel-cobalt-manganese polycrystalline composite precursor and the nickel-cobalt-manganese single-crystal composite precursor All are at least one of composite oxides, composite hydroxides, and composite oxyhydroxides of nickel, cobalt, and manganese, wherein the molar ratio of nickel, cobalt, and manganese is Ni:Co:Mn=0.3-0.98:0.01- 0.6:0.001-0.6; the nano-chromium source is an oxide or hydroxide of nano-scale chromium; the mass ratio of the nickel-cobalt-manganese polycrystalline composite precursor and the nickel-cobalt-manganese single crystal composite precursor is 2-20: 1;

[0026] The advantage...

Embodiment 1

[0032] A kind of chromium-doped nickel-cobalt-manganese lithium-ion battery positive electrode material, its molecular formula is Li a Ni x co y mn z Cr b o 2 , where, 1≤a≤1.2; 0.3≤x≤0.98; 0.01≤y≤0.6; 0.001≤z≤0.6; b is 4 / 3-a / 3-x-y-z, 0.00001≤b≤0.03.

[0033] A molecular formula is Li 1.2 Ni 0.3 co 0.6 mn 0.001 Cr 0.029 o 2 The preparation method of the chromium-doped nickel-cobalt-manganese lithium-ion battery positive electrode material, it comprises the following steps:

[0034] Step 1. Weigh nickel-cobalt-manganese polycrystalline composite precursor, nickel-cobalt-manganese single crystal composite precursor, nano-Cr 2 o 3 and a lithium source; wherein, the nickel-cobalt-manganese polycrystalline composite precursor and the nickel-cobalt-manganese single-crystal composite precursor are at least one of composite oxides, composite hydroxides, and composite oxyhydroxides of nickel, cobalt, and manganese, The molar ratio of nickel, cobalt and manganese is Ni:Co:Mn...

Embodiment 2

[0040] A kind of chromium-doped nickel-cobalt-manganese lithium-ion battery positive electrode material, its molecular formula is Li a Ni x co y mn z Cr b o 2 , where, 1≤a≤1.2; 0.3≤x≤0.98; 0.01≤y≤0.6; 0.001≤z≤0.6; b is 4 / 3-a / 3-x-y-z, 0.00001≤b≤0.03.

[0041] A molecular formula is LiNi 0.98 co 0.01 mn 0.008 Cr 0.002 o 2 The preparation method of the chromium-doped nickel-cobalt-manganese lithium-ion battery positive electrode material, it comprises the following steps:

[0042] Step 1. Weigh nickel-cobalt-manganese polycrystalline composite precursor, nickel-cobalt-manganese single crystal composite precursor, nano-Cr 2 o 3 and a lithium source; wherein, the nickel-cobalt-manganese polycrystalline composite precursor and the nickel-cobalt-manganese single-crystal composite precursor are at least one of composite oxides, composite hydroxides, and composite oxyhydroxides of nickel, cobalt, and manganese, The molar ratio of nickel, cobalt and manganese is Ni:Co:Mn=0.9...

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Abstract

The invention discloses a chromium-doped nickel-cobalt-manganese-lithium ion battery cathode material which has the following molecular formula: LiaNixCoyMnzCrbO2. According to the preparation method,premixing a nickel-cobalt-manganese monocrystal composite precursor and nanometer chromium oxide at an ultrahigh speed; mixing mixture of the nickel-cobalt-manganese monocrystal composite precursor and the nanometer chromium oxide and a common nickel-cobalt-manganese polycrystal composite precursor at high speed, so as to improve the mixing effect. As the monocrystal composite precursor is high in mechanical strength, the monocrystal composite precursor cannot be crushed by adopting ultra-high speed mixing; meanwhile, the monocrystal composite precursor can have the function of a collision medium and can be used for fully dispersing the nanometer chromium oxide, so that doped elements and host elements are fully mixed.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode material manufacturing, and in particular relates to a chromium-doped nickel-cobalt-manganese lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Nickel-cobalt-manganese ternary lithium-ion battery cathode materials are widely used in IT products and new energy vehicles due to their high energy density and relatively simple preparation process. However, due to the poor structural stability of pure nickel-cobalt-manganese oxide (LNCM), it is easy to cause the collapse of the material structure due to the deintercalation of Li ions and the change of the valence state of Ni, Co, and Mn ions during the charging and discharging process. It will cause great harm to the cycle life and safety of the material. To solve the above problems, it is generally improved by adding an appropriate amount of Cr ions. Due to Cr 3+ with you 3+ The ...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 许开华王家良张云河乐绪清
Owner JINGMEN GEM NEW MATERIAL