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Electrostatically self-assembled three-dimensional flower-like cobalt disulfide/rGO composite material, and preparation method and application thereof

An electrostatic self-assembly, cobalt disulfide technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problem of limited improvement in cycle life, and achieve the effects of reducing contact resistance, good cycle stability, and excellent rate performance.

Active Publication Date: 2019-11-05
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing cobalt sulfide / graphene composite materials only perform simple mechanical coating on the cobalt disulfide material, and the improvement of its capacity and cycle life is relatively limited.

Method used

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  • Electrostatically self-assembled three-dimensional flower-like cobalt disulfide/rGO composite material, and preparation method and application thereof
  • Electrostatically self-assembled three-dimensional flower-like cobalt disulfide/rGO composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Mix 5mmol CoSO 4 ·7H 2 O and 10mmol Na 2 Dissolve S in 40mL deionized water respectively to obtain pink A solution and transparent B solution;

[0036] 2. Slowly add the A solution described in step 1 into the B solution and mix evenly, then fully stir for 30 minutes to obtain a light red C solution;

[0037] 3. Pour the solution C described in step 2 into a stainless steel reaction kettle, then put it into a blast drying oven and heat it at 150°C for 36 hours, then carry out suction filtration after cooling in the furnace, and obtain solid D after drying;

[0038] 4. Weigh 4ml of 20wt.% polydiallyldimethylammonium chloride (PDDA) solution, add 100mL of deionized water to dilute, put 200mg of solid D obtained in step 3 into it and stir for a while, and wash by centrifugation A solid E is obtained;

[0039] 5. Weigh the aqueous solution containing 48mg of GO, add 100mL of deionized water to dilute, put 200mg of solid E obtained in step 4 into it, stir it well and ...

Embodiment 2

[0043] 1. Add 3mmol CoCl 2 ·6H 2 0 and 3mmol TAA (thioacetamide) were dissolved in 40mL deionized water respectively to obtain pink A solution and transparent B solution;

[0044] 2. Slowly add the A solution described in step 1 into the B solution and mix evenly, then fully stir for 30 minutes to obtain a light red C solution;

[0045] 3. Pour the solution C described in step 2 into a stainless steel reaction kettle, then put it into a blast drying oven and heat it at 150°C for 36 hours, then carry out suction filtration after cooling in the furnace, and obtain solid D after drying;

[0046] 4. Weigh 4ml of 20wt.% PDDA (polydiallyldimethylammonium chloride) solution, add 100mL of deionized water to dilute, put 200mg of solid D obtained in step 3 into it and stir for a while, and wash by centrifugation A solid E is obtained;

[0047] 5. Weigh the aqueous solution containing 48mg of GO, add 100mL of deionized water to dilute, put 200mg of solid E obtained in step 4 into it, ...

Embodiment 3

[0050] 1. Add 6 mmol C 4 h 6 CoO 4 and 10mmol L-cysteine ​​were dissolved in 40mL deionized water to obtain pink A solution and transparent B solution;

[0051] 2. Slowly add the A solution described in step 1 into the B solution and mix evenly, then fully stir for 30 minutes to obtain a light red C solution;

[0052] 3. Pour the solution C described in step 2 into a stainless steel reaction kettle, then put it into a blast drying oven and heat it at 280°C for 12 hours, then carry out suction filtration after cooling in the furnace, and obtain solid D after drying;

[0053] 4. Weigh 4ml of 20wt.% polydiallyldimethylammonium chloride (PDDA) solution, add 100mL of deionized water to dilute, put 200mg of solid D obtained in step 3 into it and stir for a while, and wash by centrifugation A solid E is obtained;

[0054] 5. Weigh the aqueous solution containing 48 mg of GO, add 100 mL of deionized water to dilute, put 200 mg of solid E obtained in step 4 into it, stir it thoroug...

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Abstract

The invention discloses an electrostatically self-assembled three-dimensional flower-like cobalt disulfide / rGO composite material, and a preparation method and an application thereof. The composite material is prepared by carrying out heat preservation treatment on a mixed solution of a soluble cobalt salt aqueous solution and a vulcanizing agent aqueous solution at 150-280 DEG C, adding three-dimensional flower-like cobalt disulfide obtained after suction filtration and drying into a polydiallyldimethylammonium chloride solution, carrying out stirring, adding positively charged flower-like cobalt disulfide obtained after centrifugal washing into a GO aqueous solution, carrying out stirring and standing, carrying out centrifugal washing and freeze-drying, and heating an obtained solid to 500-700 DEG C in a protective atmosphere for calcining. According to the method, the three-dimensional flower-like cobalt disulfide is self-assembled on a rGO nanosheet substrate through an electrostatic action, so that the volume effect of the cobalt disulfide in the charging and discharging processes can be effectively accommodated, and the conductive performance is good. The composite material has excellent charge-discharge cycle performance and rate performance and high first coulombic efficiency.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and more specifically relates to an electrostatic self-assembled three-dimensional flower-shaped cobalt disulfide / rGO composite material and its preparation method and application. Background technique [0002] With the progress and development of society, the energy problems faced by human beings have become increasingly prominent. Lithium-ion battery, as the most successful commercial energy storage device at present, alleviates some of people's concerns about energy storage, so it has been favored by people from all walks of life. In particular, lithium-ion batteries have been widely developed and applied in the field of electric vehicles due to their green / environmental protection and recyclable advantages. At present, the negative electrode active materials used in lithium-ion batteries on the market are usually graphite materials with good con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58
CPCH01M4/364H01M4/5815H01M4/48H01M4/366Y02E60/10
Inventor 廖松义闵永刚刘屹东王勇李越珠张诗洋
Owner GUANGDONG UNIV OF TECH
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