Multi-modified nickel-cobalt-manganese anode material and preparation method thereof

A cathode material, nickel-cobalt-manganese technology, applied in the field of multiple modified nickel-cobalt-manganese cathode materials and their preparation, can solve the problems of poor high-voltage cycle stability, poor high-rate stability, poor high-low temperature performance, etc., and achieve improved rate performance , easy to operate, reduce the effect of negative effects

Active Publication Date: 2019-03-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with lithium iron phosphate and lithium cobalt oxide, nickel-cobalt-manganese ternary materials have the advantages of moderate cost and high specific capacity, but there are still some problems that need to be solved urgently. The main problems include: low electronic conductivity; poor stability at large rates; h

Method used

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  • Multi-modified nickel-cobalt-manganese anode material and preparation method thereof
  • Multi-modified nickel-cobalt-manganese anode material and preparation method thereof
  • Multi-modified nickel-cobalt-manganese anode material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0030] Example 1

[0031] A multiple modified nickel-cobalt-manganese cathode material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0032] Step 1. Dissolve aluminum salt in isopropanol at a concentration of 0.05-0.07 mol / L to obtain solution I.

[0033] Step 2. Add the nickel-cobalt-manganese positive electrode material to the solution I according to the mass ratio of the aluminum salt to the nickel-cobalt-manganese positive electrode material of 1: (50-50.6), at room temperature and 100-150 rpm Stir for 5-10h under the condition of 60~80℃ water bath and 100~150 rpm until the isopropanol has evaporated; then place it in a blast drying oven and dry at 90~100℃ 25-40h to obtain black powder.

[0034] Step 3. Put the black powder in a tube furnace and heat-treat it at 400-440°C for 4 to 5 hours to obtain a nickel-cobalt-manganese positive electrode material coated with alumina; the nickel-cobalt coated with alumina Manganese ...

Example Embodiment

[0043] Example 2

[0044] A multiple modified nickel-cobalt-manganese cathode material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0045] Step 1. Dissolve aluminum salt in isopropanol at a concentration of 0.06~0.08mol / L to obtain solution I.

[0046] Step 2: Add the nickel-cobalt-manganese positive electrode material to the solution I according to the mass ratio of the aluminum salt to the nickel-cobalt-manganese positive electrode material of 1:(50.6-51.2), at room temperature and 100-150 rpm Stir for 5-10h under the condition of 60~80℃ water bath and 100~150 rpm until the isopropanol has evaporated; then place it in a blast drying oven and dry at 90~100℃ 25-40h to obtain black powder.

[0047] Step 3. Put the black powder in a tube furnace and heat-treat it at 415-455°C for 4 to 5 hours to obtain a nickel-cobalt-manganese positive electrode material coated with alumina; the nickel-cobalt coated with alumina Manganese ...

Example Embodiment

[0061] Example 3

[0062] A multiple modified nickel-cobalt-manganese cathode material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0063] Step 1. Dissolve aluminum salt in isopropanol according to the concentration of 0.07~0.09mol / L to obtain solution I.

[0064] Step 2. Add the nickel-cobalt-manganese positive electrode material to the solution I according to the mass ratio of the aluminum salt to the nickel-cobalt-manganese positive electrode material of 1: (51.2-51.8), and at room temperature and 100-150 revolutions per second Stir for 5-10h under the condition of 60~80℃ water bath and 100~150 rpm until the isopropanol has evaporated; then place it in a blast drying oven and dry at 90~100℃ 25-40h to obtain black powder.

[0065] Step 3. Place the black powder in a tube furnace and heat-treat it at 430-470°C for 4 to 5 hours to obtain a nickel-cobalt-manganese anode material coated with alumina; the nickel-cobalt coated...

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Abstract

The invention relates to a multi-modified nickel-cobalt-manganese anode material and a preparation method thereof. The technical scheme is that the method comprises the steps: dissolving aluminum saltin isopropanol at a concentration of 0.05-0.1 mol/L to obtain solution I; adding a nickel-cobalt-manganese anode material to the solution I at the mass ratio of 1: (50-53) of the aluminum salt to thenickel-cobalt-manganese anode material, performing stirring, drying and heat-treating to obtain A-NCM; adding an acidified carbon nanotube to tertiary butanol at a concentration of 2 to 3 kg/m3 to obtain solution II; adding A-NCM to solution II at the concentration of 40-45kg/m3 to obtain solution III; adding a polymer conductor to the solution III at a mass ratio of (1 to 2): 100 of the polymerconductor to an A-NCM anode material to obtain solution IV; adding the solution IV dropwise to liquid nitrogen to obtain spherical beads, and performing cooling and drying to prepare a heavily modified nickel cobalt manganese anode material. The method is convenient to operate and easy to industrialize, and a manufactured product is excellent in rate performance, structural stability and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of nickel-cobalt-manganese cathode materials. In particular, it relates to a multi-modified nickel-cobalt-manganese cathode material and a preparation method thereof. Background technique [0002] Nickel-cobalt-manganese ternary material (LiNi x co y mn z o 2 , where x+y+z=1, denoted as: NCM) is a new type of lithium-ion battery cathode material developed in recent years, due to the full integration of high specific capacity of lithium nickel oxide, good cycle performance of lithium cobalt oxide and manganese acid Lithium has the advantages of high safety and low cost, and the use of molecular level doping, coating, and surface modification to synthesize composite cathode materials such as manganese, nickel, and cobalt, etc., has become a research hotspot in recent years because of its good application prospects. one. [0003] Compared with lithium iron phosphate and lithium cobalt oxide, nickel-cobalt...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 周盈科朱彦斌吴关田小慧黄肖
Owner WUHAN UNIV OF SCI & TECH
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