Preparation method of transitional metal oxide/carbon nanotube porous composite negative electrode material

A technology of carbon nanotubes and transition metals, which is applied in the field of preparation of transition metal oxide/carbon nanotube porous composite negative electrode materials, can solve the problems of poor electronic conductivity of transition metal oxides, poor battery cycle stability, and poor battery rate performance, etc. problems, to achieve the effect of environmental friendliness, good potential for large-scale application, and good prospects for industrialization

Inactive Publication Date: 2018-07-13
HUNAN AIHUA GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this material also has great disadvantages: First, it produces severe volume expansion during charging and discharging, which leads to the pulverization of metal oxides, part of the electrode material falls off from the current collector, the battery capacity drops rapidly, and the cycle of the battery is stable. Secondly, the electronic conductivity of transition metal oxides is generally poor, the polarization of the electrode is serious during the charge and discharge process, the rate performance of the battery is very poor, and the charge and discharge capacity decays sharply under high current. These two shortcomings Greatly limit the commercialization of transition metal oxide anode materials

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a transition metal oxide / carbon nanotube porous composite negative electrode material, the preparation process comprising the following steps:

[0025] (1) Functionalization of carbon nanotubes: First, disperse 200 mg of untreated carbon nanotubes in 200 ml of acid (the ratio of concentrated nitric acid to concentrated hydrochloric acid is 3:1), and disperse for 30 minutes using an ultrasonic homogenizer. Add 20 mg of surfactant (surfactant is a mixture of polyethylene glycol, alkyl glycoside, and coconut acid diethanolamide) to the dispersed material at 80-120 ° C, stir vigorously, condense and reflux for 10-20 hours, then stop heating , add 800ml deionized water to dilute. Then cooled to room temperature and centrifuged to wash to neutrality, and finally the functionalized CNTs were evenly dispersed in deionized water at a certain concentration (10 mg / ml) for storage.

[0026] (2) Preparation of transition metal oxide / carbon nanotube precursor...

Embodiment 2

[0029] A preparation method of a transition metal oxide / carbon nanotube porous composite negative electrode material, the preparation process comprising the following steps:

[0030] (1) Functionalization of carbon nanotubes: First, 300 mg of untreated carbon nanotubes were dispersed in 500 mL of concentrated nitric acid, and dispersed for 30 minutes using an ultrasonic homogenizer. Add 40 mg of sodium lauryl sulfate to the dispersed material at 20-50 °C, stir vigorously, condense and reflux for 20-30 h, stop heating, and add 1000 ml of deionized water to dilute. Then cooled to room temperature and centrifuged to wash to neutrality, and finally the functionalized CNTs were uniformly dispersed in deionized water at a certain concentration (8mg / ml) for storage.

[0031] (2) Preparation of transition metal oxide / carbon nanotube precursor: a mixture of nickel chloride, nickel nitrate, and nickel sulfate (the weight ratio of nickel chloride, nickel nitrate, and nickel sulfate is 1:...

Embodiment 3

[0034] A preparation method of a transition metal oxide / carbon nanotube porous composite negative electrode material, the preparation process comprising the following steps:

[0035] (1) Functionalization of carbon nanotubes: First, 100 mg of untreated carbon nanotubes were dispersed in 10 mL of concentrated sulfuric acid, and dispersed for 30 minutes using an ultrasonic homogenizer. Add 5mg of the mixture of alkyl glucoside and coconut acid diethanolamide to the dispersed material at 50-80°C, stir vigorously, condense and reflux for 1-5h, stop heating, add 200 ml of deionized water to dilute. Then cool to room temperature and centrifuge to wash to neutrality, and finally the functionalized CNTs are evenly dispersed in deionized water at a certain concentration (1 mg / ml) for storage.

[0036] (2) Preparation of transition metal oxide / carbon nanotube precursor: stir a mixture (500 mg) of copper chloride and ferric chloride (the weight ratio of copper chloride and ferric chlorid...

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Abstract

The invention discloses a preparation method of a transitional metal oxide / carbon nanotube porous composite negative electrode material. The preparation method comprises the steps of performing functionalization of carbon nanotubes, performing preparation of a transitional metal oxide / carbon nanotube precursor, performing preparation of the transitional metal oxide / carbon nanotube porous compositenegative electrode material, and the like. By virtue of the transitional metal oxide and the carbon nanotubes with high conductivity, a carbon nanotube embedded transitional metal oxide hollow spherical structure is formed, so that a three-dimensional conductive network is formed, thereby taking full advantages of high specific capacity of the transitional metal oxide and excellent conductivity of the carbon nanotubes, and obtaining the high-rate and high-cycle-stability negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a preparation method of a transition metal oxide / carbon nanotube porous composite negative electrode material. Background technique [0002] Carbon nanotubes (CNTs) have a special hollow network structure and are combined by C-C covalent bonds, and most of the C-C covalent bonds are sp2 hybridized, which has superior mechanical properties. At the same time, CNTs have small size, large specific surface area, The advantage of good conductivity. Moreover, compared with graphite, lithium ions can not only be inserted into the tube, but also can be inserted into the gap of the tube, with more lithium intercalation sites. [0003] The specific capacity of transition metal oxides is much higher than that of graphite materials, and they are cheap, non-polluting to the environment, and have higher safety. However, this material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 艾亮曹文贾明
Owner HUNAN AIHUA GRP
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