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Metal nickel/nitrogen-doped carbon nanotube and lithium-sulfur battery composite positive electrode material thereof

A composite cathode material and nitrogen-doped carbon technology, which is applied in carbon nanotubes, battery electrodes, lithium batteries, etc., can solve the problems of poor conductivity and low utilization rate of sulfur cathode active materials, and achieve high sulfur content, low cost, and The effect of simple process

Pending Publication Date: 2020-05-29
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the technical defects of the prior art, and provides metal nickel / nitrogen-doped carbon nanotubes and composite cathode materials for lithium-sulfur batteries, so as to solve the problem of the utilization of sulfur cathode active materials due to the poor conductivity of sulfur single substance in lithium-sulfur batteries. Low rate of technical issues

Method used

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  • Metal nickel/nitrogen-doped carbon nanotube and lithium-sulfur battery composite positive electrode material thereof
  • Metal nickel/nitrogen-doped carbon nanotube and lithium-sulfur battery composite positive electrode material thereof
  • Metal nickel/nitrogen-doped carbon nanotube and lithium-sulfur battery composite positive electrode material thereof

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Effect test

Embodiment 1

[0037] A metal nickel / nitrogen-doped carbon nanotube and its lithium-sulfur battery composite cathode material, specifically prepared according to the following steps:

[0038] Step 1. Weigh 0.05g of nickel nitrate and 5g of urea and dissolve them in 50mL of deionized water. After evaporating the solvent to dryness, grind them evenly to obtain a powder substance. The temperature was raised to 800°C at a certain rate, carbonized for 4 hours, and cooled to room temperature to obtain metal nickel / nitrogen-doped carbon nanotubes (referred to as Ni@NCNT-1).

[0039] Step 2: Mix the Ni@NCNT-1 and sulfur element at a mass ratio of 1:4, grind evenly to obtain a mixture of Ni@NCNT-1 and sulfur element, transfer it to a reaction kettle, and seal it under an argon atmosphere. The reaction kettle was placed in a muffle furnace and kept at 155°C for 12 hours; then cooled to room temperature to obtain a lithium-sulfur battery composite cathode material (denoted as S / Ni@NCNT-1).

Embodiment 2

[0041] A metal nickel / nitrogen-doped carbon nanotube and its lithium-sulfur battery composite cathode material, specifically prepared according to the following steps:

[0042]Step 1, weigh 0.05g of nickel nitrate and 5g of cyanamide and dissolve them in 50mL of deionized water. After evaporating the solvent to dryness, grind them evenly to obtain a powder substance. Put the obtained powder precursor into a tube furnace. Raise the temperature to 800°C at a rate of 1 / min, carbonize for 4 hours, and cool to room temperature to obtain metal nickel / nitrogen-doped carbon nanotubes (referred to as Ni@NCNT-2).

[0043] Step 2: Mix the Ni@NCNT-2 and sulfur element at a mass ratio of 1:4, grind evenly to obtain a mixture of Ni@NCNT-2 and sulfur element, transfer it to a reaction kettle, and seal it under an argon atmosphere. The reaction kettle was placed in a muffle furnace and kept at 155°C for 12h; then cooled to room temperature to obtain a lithium-sulfur battery composite cathode ...

Embodiment 3

[0045] A metal nickel / nitrogen-doped carbon nanotube and its lithium-sulfur battery composite cathode material, specifically prepared according to the following steps:

[0046] Step 1. Weigh 0.05g of nickel nitrate and 5g of dicyandiamide and dissolve them in 50mL of deionized water. After evaporating the solvent to dryness, grind them evenly to obtain a powder substance. Put the obtained powder precursor into a tube furnace. The temperature was raised to 800°C at a rate of 1 / min, carbonized for 4 hours, and cooled to room temperature to obtain metal nickel / nitrogen doped carbon nanotubes (referred to as Ni@NCNT-3).

[0047] Step 2: Mix the Ni@NCNT-3 and sulfur element at a mass ratio of 1:4, grind evenly to obtain a mixture of Ni@NCNT-3 and sulfur element, transfer it to a reaction kettle, and seal it under an argon atmosphere. The reaction kettle was placed in a muffle furnace and kept at 155°C for 12h; then cooled to room temperature to obtain a lithium-sulfur battery compo...

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Abstract

The invention provides a metal nickel / nitrogen-doped carbon nanotube and a lithium-sulfur battery composite positive electrode material thereof. According to the material, with nickel nitrate and a nitrogen-containing organic matter adopted as raw materials, a metal nickel / nitrogen-doped carbon nanotube is prepared through a one-step high-temperature carbonization method, and is compounded with elemental sulfur through a melting-diffusion method, so that the material can be obtained; the carbon nano tube is of a bamboo joint-shaped structure; the tube diameter of the carbon nano tube is 15-75nm; a metallic nickel elementary substance is dispersed on a carbon nano tube network structure or embedded in the tube; and the particle size of the metallic nickel elementary substance is approximately consistent with the tube diameter of the carbon nano tube; and nitrogen elements are uniformly distributed on the carbon nanotube. According to the metal nickel / nitrogen-doped carbon nanotube and the lithium-sulfur battery composite positive electrode material thereof of the invention, the metal nickel / nitrogen-doped carbon nanotube is used for loading sulfur; the excellent conductivity of thenitrogen-doped carbon nanotube material, and the strong chemical interaction and electrode catalytic action of the metal nickel elementary substance on lithium polysulfide are utilized, so that the dissolution and shuttling of the lithium polysulfide can be greatly inhibited, and therefore, the lithium-sulfur battery composite positive electrode material with high specific capacity, high rate capability and high cycle stability can be obtained.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to metal nickel / nitrogen-doped carbon nanotubes and composite cathode materials for lithium-sulfur batteries. Background technique [0002] Lithium-ion batteries have become the dominant power source for many mobile devices due to their high energy density and long cycle life. However, limited by the theoretical mechanism of lithium-ion "deintercalation", the theoretical specific capacity of commercial lithium-ion batteries is lower than 300mAh / g, and the actual energy density is lower than 250Wh / kg, which cannot meet the needs of high-energy-density batteries for the development of the current electric vehicle industry. need. Different from the "deintercalation" mechanism of traditional lithium-ion batteries, during the discharge process of lithium / sulfur batteries, the active substance sulfur and metal lithium undergo a two-electron conversion reaction, with a specif...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052C01B32/16B82Y30/00
CPCB82Y30/00C01B32/16C01B2202/36H01M4/362H01M4/38H01M4/62H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 张泽熊冬根杨震宇
Owner NANCHANG UNIV
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