Preparation method for multi-walled carbon nanotube/titanium dioxide composite negative electrode material of lithium ion battery

A multi-wall carbon nanotube and ion battery technology, applied in the field of materials, can solve the problems of low conversion energy efficiency and low battery capacity, and achieve the effects of good electrical conductivity, high electrochemical activity and good cycle performance

Inactive Publication Date: 2017-05-31
JIANGHAN UNIVERSITY
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Problems solved by technology

[0005] The invention provides a method for preparing a multi-walled carbon nanotube / titanium dioxide composite lithium-ion battery negative electrode material, which solves the technical problems of low battery capacity and low conversion energy efficiency in the prior art, and achieves the goal of providing a multi-walled carbon nanotube / titanium dioxide composite negative electrode material. The preparation method of titanium dioxide composite lithium-ion battery negative electrode material has the technical effects of low raw material, simple process, good cycle performance, good conductivity and high electrochemical activity

Method used

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  • Preparation method for multi-walled carbon nanotube/titanium dioxide composite negative electrode material of lithium ion battery
  • Preparation method for multi-walled carbon nanotube/titanium dioxide composite negative electrode material of lithium ion battery
  • Preparation method for multi-walled carbon nanotube/titanium dioxide composite negative electrode material of lithium ion battery

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preparation example Construction

[0040] see figure 1 , the preparation method comprises:

[0041] Step 1 S100, the multi-walled carbon nanotubes are hydroxylated, and the hydroxylated multi-walled carbon nanotubes are filtered, washed and dried, and dispersed in ionized water to form an aqueous dispersion;

[0042] Specifically, the hydroxylation of the multi-walled carbon nanotubes in the step 1 is specifically:

[0043] Add 0.1-0.5 g of multi-walled carbon nanotubes into 3-5 moles per liter of nitric acid solution, and ultrasonically disperse for 1 hour.

[0044] Before being dispersed in deionized water in said step one, also include:

[0045] Condensation and reflux, the temperature of the condensation and reflux is 60-120 degrees Celsius, and the condensation and reflux time is 2-6 hours.

[0046] In the step 1, the hydroxylated multi-walled carbon nanotubes are filtered and washed, specifically:

[0047] Wash with deionized water until the filtrate becomes neutral.

[0048] Described in step 1 is d...

Embodiment 1

[0060] see figure 2 , figure 2 For the scanning electron micrograph of the lithium-ion battery negative pole multi-walled carbon nanotube / titanium dioxide composite material that this embodiment obtains, please refer to Figure 5 and Figure 6 .

[0061] (1) ultrasonically disperse 0.1 g of multi-walled carbon nanotubes into 3 moles per liter of nitric acid solution, condense and reflux at 120 degrees Celsius for 5 hours, filter and clean with deionized water until the filtrate becomes neutral, and dry at 80 degrees Celsius for 8 hours, The dried sample was added into deionized water, ultrasonically dispersed, and configured as an aqueous dispersion of hydroxylated multi-walled carbon nanotubes at 1 mg / ml.

[0062] (2) Mix 0.5 g of potassium titanium oxalate with 10 ml of aqueous dispersion of hydroxylated multi-walled carbon nanotubes with a concentration of 1 mg per ml and 30 ml of diethylene glycol, stir at a medium speed in a water bath at 60 degrees Celsius until Th...

Embodiment 2

[0065] see image 3 , image 3 For the scanning electron micrograph of the lithium-ion battery negative pole multi-walled carbon nanotube / titanium dioxide composite material that this embodiment obtains, please refer to Figure 5 and Figure 6 .

[0066] (1) ultrasonically disperse 0.1 g of multi-walled carbon nanotubes into 3 moles per liter of nitric acid solution, condense and reflux at 120 degrees Celsius for 5 hours, filter and clean with deionized water until the filtrate becomes neutral, and dry at 80 degrees Celsius for 8 hours, The dried sample was added into deionized water and ultrasonically dispersed to form an aqueous dispersion of hydroxylated multi-walled carbon nanotubes at 2 mg / ml.

[0067] (2) 0.5 g of potassium titanium oxalate and 10 ml of aqueous dispersion of hydroxylated multi-walled carbon nanotubes with a concentration of 1 mg per ml and 30 ml of diethylene glycol were stirred at a medium speed in a water bath at 60 degrees Celsius until A uniform ...

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Abstract

The invention discloses a preparation method for a multi-walled carbon nanotube / titanium dioxide composite negative electrode material of a lithium ion battery. The preparation method comprises the steps of 1, performing hydroxylation of the multi-walled carbon nanotubes, and filtering, washing and drying the hydroxylated multi-walled carbon nanotubes, and dispersing into deionized water to form a water dispersing solution; 2, mixing titanium potassium oxalate, the water dispersing solution and diethylene glycol at a first temperature, and performing a hydrothermal reaction; and 3, filtering hydrothermal products obtained after the hydrothermal reaction in the step 2, and calcining the products in an inert gas, and cooling to obtain the multi-walled carbon nanotube / titanium dioxide composite negative electrode material of the lithium ion battery. The preparation method for the multi-walled carbon nanotube / titanium dioxide composite negative electrode material of the lithium ion battery provided by the invention achieves the technical effects of low cost of raw materials, simple process, high cycling performance, high conductivity, and high electrochemical activity.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a preparation method of a multi-walled carbon nanotube / titanium dioxide composite lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, high specific power, and long cycle life, and have been widely used, and are considered to be the most ideal energy supply devices for next-generation hybrid vehicles and electric vehicles. With the depletion of fossil energy and the intensification of the global greenhouse effect, many problems and challenges have emerged one after another, and people's demand for clean, non-polluting and clean energy has gradually increased, and the use of nano-functional materials to build storage devices to meet more efficient energy conversion has great potential. profound meaning. [0003] Graphite has become the main source of commercial lithium-ion battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/583B82Y40/00
CPCB82Y40/00H01M4/362H01M4/505H01M4/583Y02E60/10
Inventor 刘钰旻夏宇熊万晟江云
Owner JIANGHAN UNIVERSITY
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