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Preparation method of graphitized hollow carbon microspheres capable of being applied to sulfur carrying and application thereof

A carbon microsphere and graphitization technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of high sulfur conductivity, unfavorable transportation, low sulfur utilization rate, etc., and achieve excellent battery electrical performance and battery life. Long, stable discharge voltage effect

Active Publication Date: 2019-03-15
HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the very high conductivity of sulfur is not conducive to the transmission of electrons. Usually, only the sulfur in contact with the current collector participates in the reaction of pure sulfur electrodes, resulting in a very low utilization rate of sulfur, and to provide an effective capacity solution. and cost issues, the preparation method and application of graphitized hollow carbon microspheres that can be used for sulfur loading can improve the rate

Method used

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  • Preparation method of graphitized hollow carbon microspheres capable of being applied to sulfur carrying and application thereof
  • Preparation method of graphitized hollow carbon microspheres capable of being applied to sulfur carrying and application thereof
  • Preparation method of graphitized hollow carbon microspheres capable of being applied to sulfur carrying and application thereof

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Embodiment 1

[0024] Embodiment 1: Take the silica hard template method to prepare graphitized hollow carbon microspheres as an example:

[0025] An embodiment of the present invention provides a method for preparing a sulfur-loaded material that can be used in a lithium-sulfur battery, the method comprising:

[0026] (1) Weigh nano-silica, dopamine hydrochloride, nickel nitrate hexahydrate and water according to stoichiometry, stir and react under air atmosphere at room temperature for 16 hours, silica template agent, dopamine hydrochloride as N-doped carbon source, nickel nitrate hexahydrate It is a nickel source catalyst, and water is a solvent; by mass percentage, 1% of nano silicon dioxide, 21% of dopamine hydrochloride, 27% of nickel nitrate hexahydrate, and the balance is water.

[0027] (2) The obtained carbon-coated silica precursor was calcined at 800° C. for 2 hours in a nitrogen atmosphere. Then use hydrofluoric acid to remove the template silica, use hydrochloric acid to remov...

Embodiment 2

[0030] Example 2: Preparation of graphitized hollow carbon microspheres by hydrothermal assisted soft template method as an example

[0031] An embodiment of the present invention provides a method for preparing a sulfur-loaded material that can be used in a lithium-sulfur battery, the method comprising:

[0032] (1) Weigh sucrose according to stoichiometry, mix and stir nickel nitrate hexahydrate and water, pour it into a polytetrafluoroethylene reactor, and react in a vacuum oven at 180°C for 6 hours; Nickel nitrate 11%, the balance is water;

[0033] (2) The obtained carbon microsphere precursor was calcined at 800 °C for 2 h in a nitrogen atmosphere. Then use hydrochloric acid to remove nickel, centrifuge washing and drying, and obtain graphitized hollow carbon microspheres at 150-160 o Under the environment of C, the active material can be obtained by loading sulfur by melting diffusion method.

[0034] (3) According to the ratio of active material: acetylene black: PV...

Embodiment 1

[0036] The difference between Embodiment 1 and Embodiment 2 lies in that: the hard template method and the hydrothermally assisted soft template method are used respectively. Using different carbon sources as sulfur-loaded carbon materials, one is N-doped carbon source dopamine hydrochloride, the other is cheap sucrose as carbon source, assembled into a battery for constant current discharge test, the results show that graphitization synthesized by N-doped carbon source The long-term cycle performance of lithium-sulfur batteries after sulfur-loaded hollow carbon microspheres is better.

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Abstract

The invention discloses a preparation method of graphitized hollow carbon microspheres capable of being applied to sulfur carrying and application thereof. A hollow carbon microsphere is high in graphitization degree, and can provide a fast channel for electron transfer, so that the hollow carbon microsphere has high ionic conductivity; the hollow carbon microsphere is complex in structure, has good mechanical strength, can not only improve electron transfer of lithium-sulfur batteries, but also enlarge the contact area between sulfur and electron and improve the sulfur utilization. The methodis simple to operate, and the hollow carbon microsphere can improve the rate capability and cycle performance of the lithium-sulfur batteries when being applied to the batteries.

Description

technical field [0001] The invention belongs to the technical field of green energy storage, and specifically relates to a method for efficiently preparing graphitized hollow carbon microspheres and its application. The high-capacity battery prepared by the method can effectively solve the problems of capacity and cost, and can improve the rate performance. It has broad application prospects in the field of energy storage batteries. Background technique [0002] At present, the problems of low energy density and short life have gradually become the focus of the future development of power lithium-ion batteries (LIB) in hybrid electric vehicles and large-scale energy storage systems. As one of the most potential cathode candidates, sulfur (S) has a high specific capacity (theoretical specific capacity is 1675 mAh g-1), and its energy density is as high as 2600 Wh Kg-1 or 2800 Wh L-1. Commercial lithium-ion batteries have more than five times the energy density, and are low i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/36H01M4/38H01M4/62H01M10/052
CPCC01B32/205H01M4/366H01M4/38H01M4/625H01M10/052Y02E60/10
Inventor 楼平黄晓明蔡炜吴凯蒋建杰曹元成邓鹤鸣
Owner HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD
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