Carbon-nitrogen material and preparation method thereof, lithium-sulfur battery positive electrode material and lithium-sulfur battery containing it

A carbon-nitrogen material and catalyst technology, applied in the field of new energy batteries, can solve the problems of poor cycle stability of lithium-sulfur batteries, and achieve the effects of improving cycle stability, reducing the amount of dissolution, and reducing the chance of being dissolved in the electrolyte

Active Publication Date: 2021-04-06
桑德新能源技术开发有限公司 +1
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Problems solved by technology

[0005] The first object of the present invention is to provide a preparation method of carbon-nitrogen material and the carbon-nitrogen material obtained by the preparation method, so as to relieve the lithium-sulfur battery in the prior art from being easily dissolved in the electrolyte due to the intermediate product lithium polysulfide. Technical issues leading to poor cycle stability of lithium-sulfur batteries

Method used

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  • Carbon-nitrogen material and preparation method thereof, lithium-sulfur battery positive electrode material and lithium-sulfur battery containing it
  • Carbon-nitrogen material and preparation method thereof, lithium-sulfur battery positive electrode material and lithium-sulfur battery containing it
  • Carbon-nitrogen material and preparation method thereof, lithium-sulfur battery positive electrode material and lithium-sulfur battery containing it

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preparation example Construction

[0032] On the one hand, the invention provides a kind of preparation method of carbon-nitrogen material, comprises the following steps:

[0033] The mixture of the catalyst and melamine is placed in an inert atmosphere for sintering to obtain the carbon-nitrogen material.

[0034] The preparation method of the carbon-nitrogen material provided by the present invention uses melamine as the reaction raw material, and rapidly synthesizes the carbon-nitrogen material (such as carbon-nitrogen nanotube) through high-temperature sintering under the action of a catalyst (such as nickel chloride). Owing to adopting melamine as raw material in this preparation method, the atomic arrangement structure diagram of the carbon-nitrogen material obtained after sintering is as follows figure 2 As shown, will figure 2 and figure 1 Compared with the schematic diagram of the structure, it can also be seen that the nitrogen content is significantly increased.

[0035] In addition, in the prep...

Embodiment 1

[0058] This embodiment is a carbon-nitrogen nanotube. The preparation method of the carbon-nitrogen nanotube is: uniformly mix nickel chloride and melamine with a mass ratio of 2:8 through high-energy ball milling, and then heat to 600 °C under an argon atmosphere. ℃, keep warm for 4h, and obtain carbon-nitrogen nanotubes with a diameter of about 100nm, whose structure is as follows image 3 shown.

Embodiment 2

[0060] This embodiment is a positive electrode material for a lithium-sulfur battery, including sulfur powder and carbon-nitrogen nanotubes in Embodiment 1, wherein the mass ratio of sulfur powder to carbon-nitrogen nanotubes is 70:30.

[0061] The preparation method of the positive electrode material of the lithium-sulfur battery is as follows: high-energy ball milling of sulfur powder with a mass ratio of 70:30 and carbon-nitrogen nanotubes for 2 hours, then putting the prepared powder into a 200ml reaction kettle, heating to 155°C, and keeping it warm After 12 hours, the cathode material for lithium-sulfur battery was obtained.

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Abstract

The invention provides a carbon-nitrogen material and a preparation method thereof, as well as a lithium-sulfur battery positive electrode material and a lithium-sulfur battery containing the same, and relates to the technical field of new energy batteries. The preparation method of the carbon-nitrogen material comprises the following steps: combining a catalyst and melamine The mixture is sintered under an inert atmosphere to obtain the carbon-nitrogen material. The carbon-nitrogen nanotubes obtained by this preparation method can alleviate the technical problem of poor cycle stability of lithium-sulfur batteries in the prior art due to the easy dissolution of the intermediate product lithium polysulfide in the electrolyte, and achieve the improvement of lithium-sulfur batteries. Technical effects on cycle stability.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a carbon-nitrogen material and a preparation method thereof, as well as a lithium-sulfur battery positive electrode material and a lithium-sulfur battery containing the same. Background technique [0002] Lithium-sulfur batteries have the advantages of light weight, large capacity, and no memory effect. Among them, the theoretical specific capacity of lithium-sulfur batteries is as high as 1675mAh / g, and the theoretical energy density is as high as 2600Wh / kg, which is significantly higher than the theoretical capacity of commercial lithium-ion batteries. [0003] However, existing studies have shown that during the charging and discharging process of lithium-sulfur batteries, lithium polysulfides, an intermediate product, will be produced, and lithium polysulfides will be dissolved in ether-based electrolytes, resulting in poor cycle performance of lithium-sulfur batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/052C01B21/082B82Y30/00
CPCB82Y30/00C01B21/0605C01P2004/03C01P2004/13C01P2006/40H01M4/628H01M10/052Y02E60/10
Inventor 柯菲苗力孝
Owner 桑德新能源技术开发有限公司
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