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Modified carbon nanotube-modified nickel cobalt manganese ternary composite electrode material and preparation method therefor

A carbon nanotube and ternary composite technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor rate stability, poor high-voltage cycle stability, low electronic conductivity, etc., to achieve low cost and improve transfer rate. , the effect of simple synthesis process

Active Publication Date: 2018-02-16
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a nickel-cobalt-manganese ternary composite electrode material modified by synthetically modified carbon nanotubes and its preparation method. The modified material can improve low electronic conductivity, poor rate stability, and poor high-voltage cycle stability. question

Method used

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Examples

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Effect test

Embodiment 1

[0039] Weigh 1 g of carbon nanotubes and 0.075 g of melamine, put them into a ball mill jar, mill for 4 hours, then place the above mixture in a box furnace protected by a nitrogen atmosphere, and roast at 500 ° C for 6 hours to obtain nitrogen-modified carbon nanotubes . Then weigh 9.22g of nickel-cobalt-manganese precursor, put 3.8g of lithium carbonate in a ball mill jar, add 50 ml of absolute ethanol, and then add 0.651g of nitrogen-modified carbon nanotubes into the above suspension. The above solution was fully dispersed and ball milled for 4 hours to obtain a uniformly dispersed solution, and the above solution was dried in an oven at 70°C for 12 hours to obtain a dry nitrogen-modified carbon nanotube-modified nickel-cobalt-manganese composite electrode material precursor. The precursor was placed in a box furnace, calcined at 800°C for 12 hours under a nitrogen atmosphere, and the heating rate was 5°C / min, and a modified nickel-cobalt-manganese with a mass percentage o...

Embodiment 2

[0041] Weigh 1 g of carbon nanotubes and 0.06 g of melamine, put them into a ball mill jar, mill for 4 hours, then place the above mixture in a box furnace protected by a nitrogen atmosphere, and roast at 400 ° C for 4 hours to obtain nitrogen-modified carbon nanotubes . Then weigh 9.22g of nickel-cobalt-manganese precursor, put 3.88g of lithium carbonate in a ball mill jar, add 50 ml of absolute ethanol, and then add 0.131g of nitrogen-modified carbon nanotubes into the above suspension. The above solution was fully dispersed and ball milled for 5 hours to obtain a uniformly dispersed solution, and the above solution was dried in an oven at 60° C. for 14 hours to obtain a dry nitrogen-modified carbon nanotube-modified nickel-cobalt-manganese composite electrode material precursor. The precursor was placed in a box furnace, and calcined at 700°C for 24 hours under a nitrogen atmosphere, with a heating rate of 4°C / min, to prepare a modified nickel-cobalt-manganese with a mass p...

Embodiment 3

[0043]Weigh 1 g of carbon nanotubes and 0.2862 g of boric acid, put them into a ball mill jar, mill for 4 hours, then place the above mixture in a box furnace protected by a nitrogen atmosphere, and roast at 500 ° C for 6 hours to obtain boron-modified carbon nanotubes . Then weigh 9.22g of nickel-cobalt-manganese precursor, put 3.8g of lithium carbonate in a ball mill jar, add 50 ml of absolute ethanol, and then add 0.651g of boron-modified carbon nanotubes into the above suspension. The above solution was fully dispersed and ball milled for 4 hours to obtain a uniformly dispersed solution, and the above solution was dried in an oven at 70°C to obtain a dry boron-modified carbon nanotube-modified nickel-cobalt-manganese composite electrode material precursor. The precursor was placed in a box furnace, calcined at 800°C for 12 hours under a nitrogen atmosphere, and the heating rate was 5°C / min, and a modified nickel-cobalt-manganese with a mass percentage of boron-modified car...

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Abstract

The invention relates to a modified nanotube-modified nickel cobalt manganese ternary composite electrode material. The ternary composite electrode material is prepared from modified carbon nanotubesand a precursor; the modified carbon nanotubes comprise one or two kinds of nitrogen modified carbon nanotubes or boron modified carbon nanotubes; the modified carbon nanotubes account for 1-10% of the composite electrode material; the precursor comprises lithium carbonate and nickel cobalt manganese; and the molar ratio of the lithium element in nickel cobalt manganese to nickel cobalt manganeseis 1.0-1.05 to 1. The invention also provides a preparation method of the composite electrode material. By virtue of the preparation method, the problems of low electronic conductivity, poor rate stability, poor high-voltage cycling stability and the like can be solved.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for preparing a nickel-cobalt-manganese ternary positive electrode material modified by modified nanotubes. Background technique [0002] Ternary lithium-ion battery cathode material is a new type of lithium-ion battery cathode material developed in recent years, which has the advantages of moderate cost, high capacity, and high cycle stability. Ternary materials, compared with lithium cobalt oxide materials, reduce production costs, improve safety performance, and have higher stability compared with lithium manganese oxide materials, and their status in positive electrode materials is gradually emerging. In the future, electric vehicles, power In the field of batteries, ternary materials will be favorable competitors. [0003] Compared with lithium cobalt oxide, ternary materials also have some problems that need to be solved urgently, mainly including low el...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 任斌刘振法张利辉何蕊李文魏爱佳白薛
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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