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Cos@carbon nano-cage as well as preparation method and application thereof

A carbon nanocage and solution technology, applied in the field of lithium-ion batteries, can solve problems such as structural collapse and reduced cycle stability, and achieve the effects of low cost, good cycle performance, and high specific capacity

Inactive Publication Date: 2017-02-22
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem that the metal sulfide in the charging and discharging process, due to the excessive volume change, leads to the collapse of the structure and the powderization of the material, which greatly reduces the cycle stability.

Method used

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  • Cos@carbon nano-cage as well as preparation method and application thereof
  • Cos@carbon nano-cage as well as preparation method and application thereof
  • Cos@carbon nano-cage as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing CoS@carbon nanocages: specifically comprising the following steps:

[0025] 1) Preparation of ZIF-67 precursor: 0.4g of Co(NO 3 ) 2 •6H 2 O and 5.0 g of 2-methylimidazole were dissolved in 5 ml and 19 ml of deionized water respectively, and after the complete dissolution, the Co(NO 3 ) 2 •6H 2 The O solution was added dropwise to the 2-methylimidazole solution, and then 80 mg of polyvinylpyrrolidone (PVP) was added, and stirred at 25 °C for 6 h. The reaction product was washed with deionized water and ethanol for three times, and then dried. The Co@carbon nanocages were obtained by calcination at 550℃ for 4 h in a tube furnace;

[0026] 2) Weigh 150 mg of Co@carbon nanocages and 30 mg of sulfur powder, mix and grind for 30 minutes, and roast the ground samples in a tube furnace at 360 °C for 2 hours to prepare CoS@carbon nanocages.

[0027] Lithium-ion battery assembly: by mass ratio CoS@carbon nanocage: polytetrafluoroethylene: acetylene bl...

Embodiment 2

[0029] A method for preparing CoS@carbon nanocages: specifically comprising the following steps:

[0030] 1) Preparation of ZIF-67 precursor: 0.5 g of Co(NO 3 ) 2 •6H 2 O and 6.0 g of 2-methylimidazole were dissolved in 5 ml and 20 ml of deionized water respectively, and after the complete dissolution, the Co(NO 3 ) 2 •6H 2 The O solution was added dropwise to the 2-methylimidazole solution, and then 150 mg of polyvinylpyrrolidone (PVP) was added, and stirred at 25 °C for 10 h. The reaction product was washed with deionized water and ethanol for 3 times, and then dried. The Co@carbon nanocages were obtained by calcination at 600℃ for 5 h in a tube furnace;

[0031] 2) Weigh 160 mg of Co@carbon nanocages and 35 mg of sulfur powder, mix and grind for 35 minutes, and roast the ground samples in a tube furnace at 400 °C for 3 hours to prepare CoS@carbon nanocages.

[0032] Lithium-ion battery assembly: by mass ratio CoS@carbon nanocage: polytetrafluoroethylene: acetylene bla...

Embodiment 3

[0034] A method for preparing CoS@carbon nanocages: specifically comprising the following steps:

[0035] 1) Preparation of ZIF-67 precursor: 0.6 g of Co(NO 3 ) 2 •6H 2 O and 6.5 g of 2-methylimidazole were dissolved in 6 ml and 21 ml of deionized water respectively, and after the complete dissolution, the Co(NO 3 ) 2 •6H 2 The O solution was added dropwise to the 2-methylimidazole solution, and then 200 mg of polyvinylpyrrolidone (PVP) was added, stirred at 25 °C for 12 h, and the reaction product was washed with deionized water and ethanol for three times, then dried, The Co@carbon nanocages were obtained by calcination at 650℃ for 6 h in a tube furnace;

[0036] 2) Weigh 180 mg of Co@carbon nanocages and 40 mg of sulfur powder, mix and grind for 40 minutes, and roast the ground samples in a tube furnace at 450 °C for 5 hours to prepare CoS@carbon nanocages.

[0037] Lithium-ion battery assembly: by mass ratio CoS@carbon nanocage: polytetrafluoroethylene: acetylene bla...

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Abstract

The invention provides a Cos@carbon nano-cage as well as a preparation method and application thereof. Cobalt-base metal organic framework materials (ZIF-67) are synthesized as a carbon source and a cobalt source and are taken as a precursor to be directly calcined with powdered sulfur so as to obtain a composite nanomaterial of the Cos@carbon nano-cage. According to the Cos@carbon nano-cage, the problems that the structure is collapsed, the material is powdered, and the cycle performance is greatly decreased when the volume of the metal sulfide is changed too much during the charging and discharging are solved. The carbon nano-cage can supply more lithium storage gaps, so that the integral electrical conductivity of the material is improved, the volume change caused by the disembedding of lithium ions can be effectively relieved, and the agglomeration of CoS particles can be further prevented. Therefore, the composite material has relatively good application prospect in electrode materials of lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a CoS@carbon nanocage and its preparation method and application. Background technique [0002] Lithium-ion batteries have been widely used because of their small size, light weight, high working voltage, high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. At present, it is mainly used in mobile electronic equipment, defense industry, electric vehicles and other fields. Since the low specific capacity of carbon materials (theoretical value is only 372 mAh / g) greatly limits the further development of lithium-ion batteries, there is an urgent need to develop high specific capacity anode materials. Metal sulfides have high theoretical specific capacity and good electrical conductivity, and are a class of anode materials for lithium-ion batteries with good application prospects. However, during the chargin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 洪振生赖兰芳周凯强
Owner FUJIAN NORMAL UNIV
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