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CoS graded nano-bubble composite sulfur positive electrode material of lithium sulfur battery and preparation method of positive electrode material

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, nanotechnology, etc., can solve the problems of low sulfur utilization rate of lithium-sulfur batteries, obstacles to popularization and application, short cycle life, etc., to achieve large commercial application prospects, The effect of no pollution to the environment and mild reaction conditions

Active Publication Date: 2018-08-24
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-sulfur batteries still have shortcomings such as low sulfur utilization rate, short cycle life, and poor safety, which seriously hinder their popularization and application. How to overcome these shortcomings has become a key problem to be solved urgently.
The root of the problem of lithium / sulfur batteries is the electrical insulation of elemental sulfur and its discharge products, the intermediate product of charge and discharge lithium polysulfide Li 2 S n (8>n≥4) Shuttle effect caused by solubility, severe cycle shrinkage of active materials (volume effect)

Method used

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  • CoS graded nano-bubble composite sulfur positive electrode material of lithium sulfur battery and preparation method of positive electrode material
  • CoS graded nano-bubble composite sulfur positive electrode material of lithium sulfur battery and preparation method of positive electrode material
  • CoS graded nano-bubble composite sulfur positive electrode material of lithium sulfur battery and preparation method of positive electrode material

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Experimental program
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Embodiment 1

[0029] Synthetic TiO 2 @ Hexadecylamine composite nanoparticles: ultrasonically disperse 0.1 g of hexadecylamine in 10 mL of absolute ethanol, then add 0.2 mL of ammonia water under stirring, continue stirring for 5 min, then add 0.1 mL of titanium under vigorous stirring Acetate isopropyl ester (TIP), centrifuged after stirring for 10 min, washed 3 times with absolute ethanol.

[0030] TiO with jujube cake structure 2 Composite nanoparticles embedded with ZIF-67: Dissolve 0.5 g PVP in 10 mL absolute ethanol, and then clean TiO 2 @ Hexadecylamine composite nanoparticles were dispersed in the PVP ethanol solution, stirred at room temperature for 24 h, washed with absolute ethanol for 3 times, and then dispersed in 2.5 mL of methanol solution again. Take 1.3 mL of TiO2 Add the methanol solution of @hexadecylamine dropwise into the methanol solution of cobalt nitrate with a volume of 50 mL and a concentration of 20 mM, stir for 3 min, then quickly add a methanol solution of 80 ...

Embodiment 2

[0041] Synthetic TiO 2 Nanoparticles: Add 0.2 mL of ammonia water to 10 mL of absolute ethanol, stir for 5 min, then add 0.1 mL of isopropyl titanate (TIP) under vigorous stirring, centrifuge after stirring for 10 min, wash with absolute ethanol for 3 Second-rate.

[0042] TiO with jujube cake structure 2 Composite nanoparticles embedded with ZIF-67: Dissolve 0.5 g PVP in 10 mL absolute ethanol, and then clean TiO 2 @ Hexadecylamine composite nanoparticles were dispersed in the PVP ethanol solution, stirred at room temperature for 24 h, washed with absolute ethanol for 3 times, and then dispersed in 2.5 mL of methanol solution. Take 0.5 mL of TiO 2 The methanol solution was dropped into the methanol solution of cobalt nitrate with a volume of 50 mL and a concentration of 20 mM. After stirring for 3 min, a methanol solution of 2-methylimidazole with a volume of 80 mL and a concentration of 80 mM was quickly added, and after stirring for 3 min, After standing for 12 h, the p...

Embodiment 3

[0048] Synthetic TiO 2 Nanoparticles: Add 0.2 mL of ammonia water to 10 mL of absolute ethanol, stir for 5 min, then add 0.1 mL of isopropyl titanate (TIP) under vigorous stirring, centrifuge after stirring for 10 min, wash with absolute ethanol for 3 Second-rate.

[0049] TiO with jujube cake structure 2 Composite nanoparticles embedded with ZIF-67: Dissolve 0.5 g PVP in 10 mL absolute ethanol, and then clean TiO 2 @ Hexadecylamine composite nanoparticles were dispersed in the PVP ethanol solution, stirred at room temperature for 24 h, washed with absolute ethanol for 3 times, and then dispersed in 2.5 mL of methanol solution. Take 1.3 mL of TiO 2 The methanol solution was dropped into the methanol solution of cobalt nitrate with a volume of 50 mL and a concentration of 10 mM. After stirring for 3 min, a methanol solution of 2-methylimidazole with a volume of 80 mL and a concentration of 40 mM was quickly added. After stirring for 3 min, After standing for 12 h, the produ...

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Abstract

The invention discloses a CoS graded nano-bubble composite S positive electrode material of a lithium sulfur battery, and belongs to the technical field of the lithium sulfur battery. The preparationmethod of the CoS graded nano-bubble composite S positive electrode material comprises the steps of firstly, synthesizing TiO2 composite hexadecylamine nanoparticle by hydrolysis of titanium isopropoxide; secondly, coating a surface of the TiO2 composite hexadecylamine nanoparticle with a layer of MOF-loying PVP so that the TiO2 composite nanoparticle can be absorbed during the growth process of ZIF67 and a surface is embedded and an interior are buried onto ZIF-67 to form a Chinese data structure; and finally, performing vulcanization to obtain a CoS graded nano-bubble material with a plurality of CoS hollow spheres sleeving a CoS hollow polyhedron by hydrothermal method of thioacetamide, and injecting S into the CoS graded nano bubbles by a melting method to obtain a final material. TheCoS graded nano-bubble composite S provided by the invention is used as a lithium sulfur battery positive electrode, relatively high charge-discharge performance and stable cycle property are shown, and the important application value in the field of the lithium sulfur battery is achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] The rapid development of electric vehicles and mobile electronic devices urgently requires the development of batteries with high energy density, long cycle life, and low cost. At present, commercial lithium-ion batteries are limited by the theoretical capacity of positive electrode materials, and there is little room for further improvement of energy density. It is difficult to meet the market demand for high-energy-density batteries. Therefore, the development of new high-energy-density electrode materials and new electrochemical energy storage systems has become an important issue. The current research hotspot of secondary battery technology. [0003] In the new energy storage system, lithium / sulfur batteries have great potential for developme...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/5815H01M10/052Y02E60/10
Inventor 严微微
Owner CHINA JILIANG UNIV
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