Preparation of carbon nanotube and application of carbon nanotube in lithium ion battery

A technology of carbon nanotubes and metal acetate, which is applied in the direction of carbon nanotubes, nanocarbons, battery electrodes, etc., can solve the problems of cumbersome process steps and equipment and instruments, reduce market competitiveness, and increase battery costs, and achieve a good cycle Performance, cost reduction, and conductivity improvement effects

Pending Publication Date: 2020-10-16
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0004] At present, although there have been some reports on improving the performance of lithium-ion batteries by doping modified carbon materials, these solutions require cumbersome process steps and equipment and instruments in the actual production and preparation process, consuming various Expensive chemical raw materials increase battery costs and prices, reducing market competitiveness

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  • Preparation of carbon nanotube and application of carbon nanotube in lithium ion battery
  • Preparation of carbon nanotube and application of carbon nanotube in lithium ion battery
  • Preparation of carbon nanotube and application of carbon nanotube in lithium ion battery

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preparation example Construction

[0036] The invention provides a method for preparing carbon nanotubes, comprising the following steps:

[0037] A) mixing the aqueous solution of metal acetate with nitrogen-containing organic matter, heating and dissolving to obtain a mixed solution;

[0038] Described metal acetate is selected from Ni(CH 3 COO) 2 or Co(CH 3 COO) 2 , the nitrogen-containing organic matter is selected from dicyandiamide, melamine or urea;

[0039] B) heating the mixed solution until the solvent volatilizes to obtain a solid powder of the starting material;

[0040] C) Under a protective atmosphere condition, the solid powder of the starting raw material is calcined by increasing the temperature step by step to obtain carbon nanotubes.

[0041] The present invention first configures the aqueous solution of metal acetate. Specifically, the metal acetate is dissolved in water and subjected to ultrasonic treatment to obtain an aqueous solution of the metal acetate.

[0042] Described metal ...

Embodiment 1

[0065] Weigh 0.2 g Ni(CH 3 COO) 2 Dissolve in deionized water with a volume of 20mL, after ultrasonic treatment for 5 minutes to completely dissolve, weigh 1 gram of dicyandiamide, add the above solution, stir for 10 minutes, heat to 80°C, keep warm for 2 hours, until the solid is completely dissolved , the temperature was raised to 95° C., and the temperature was maintained for 6 hours until all the solvents evaporated, and then the obtained solid powder of the starting material was collected.

[0066] Transfer the solid powder of the above starting raw materials to a corundum magnetic boat, place it in a high-temperature tube furnace, blow in argon to exhaust the air in the tube, raise the temperature to 550 °C at a rate of 10 °C per minute, and calcined for 2 hours. get yellow Ni 2+ -g -C 3 N 4 Sample powder.

[0067] Put the above-mentioned Ni in the corundum crucible in the high temperature tube furnace 2+ -g -C 3 N 4 The powder was continuously heated from 550°C ...

Embodiment 2

[0083] Weigh 0.4 g Ni(CH 3 COO) 2 Dissolve in deionized water with a volume of 30mL, after ultrasonic treatment for 8 minutes to completely dissolve, weigh 2 grams of dicyandiamide, add the above solution, stir for 15 minutes, heat to 75°C, keep warm for 3 hours, until the solid is completely dissolved , the temperature was raised to 97° C., and the temperature was kept for 7 hours until the solvent was completely evaporated, and then the obtained solid powder of the starting material was collected.

[0084]Transfer the solid powder of the above starting raw materials to a corundum magnetic boat, place it in a high-temperature tube furnace, blow in argon to exhaust the air in the tube, raise the temperature to 530 °C at a rate of 12 °C per minute, and calcined for 2.5 hours. get yellow Ni 2+ -g -C 3 N 4 Sample powder.

[0085] Put the above-mentioned Ni in the corundum crucible in the high temperature tube furnace 2+ -g -C 3 N 4 The powder was continuously heated from ...

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Abstract

The invention provides a preparation method of a carbon nanotube. The method comprises the following steps of: A) mixing an aqueous solution of metal acetate with a nitrogen-containing organic matter,and performing heating for dissolving to obtain a mixed solution; wherein the metal acetate is selected from Ni(CH3COO)2 or Co(CH3COO)2, and the nitrogen-containing organic matter is selected from dicyandiamide, melamine or urea; B) heating the mixed solution until the solvent is volatilized to obtain initial raw material solid powder; and C) under a protective atmosphere condition, carrying outstaged heating calcination on the initial raw material solid powder to obtain the carbon nanotube. According to the method, cheap chemical raw materials are used as the initiator, the nitrogen-doped carbon nanotube is directly prepared through a high-temperature pyrolysis method, and the cost can be reduced. The nitrogen doping effectively enhances the conductivity of the carbon tube and reduces the internal resistance value of the battery, and the carbon nanotube material shows higher specific capacity and better cycle performance than a traditional lithium battery negative electrode carbon material under the condition of high-rate charging and discharging.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to the preparation of a carbon nanotube and its application in lithium ion batteries. Background technique [0002] High-performance rechargeable lithium-ion batteries (LIBs) are in increasing demand and are widely used in hybrid electric vehicles, portable electronic devices, and large-scale power storage. However, two-dimensional graphite materials are currently the main anode materials for commercial use, which have been insufficient for the development of next-generation rechargeable lithium-ion batteries for many years. In this regard, researchers have made many research efforts to solve these problems, including reducing the material Size, the design of one-dimensional nanocarbons includes carbon nanotubes (CNTs) and carbon nanofibers (CNFs), forming porous, hollow and defect structures, doping other elements, such as phosphorus and nitrogen, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/16H01M4/62H01M10/0525
CPCC01B32/16H01M4/625H01M10/0525C01B2202/22Y02E60/10
Inventor 江俊朱青罗毅李鑫杨丽陈晓露汤乐
Owner UNIV OF SCI & TECH OF CHINA
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