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A kind of electrostatic self-assembly three-dimensional flower-like cobalt disulfide/rgo composite material and its preparation method and application

An electrostatic self-assembly, cobalt disulfide technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problem of limited cycle life improvement, achieve high specific capacity conductivity, high first Coulombic efficiency, excellent rate and cycle performance effect

Active Publication Date: 2022-04-08
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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  • A kind of electrostatic self-assembly three-dimensional flower-like cobalt disulfide/rgo composite material and its preparation method and application
  • A kind of electrostatic self-assembly three-dimensional flower-like cobalt disulfide/rgo composite material and its preparation method and application

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 electrostatic self-assembled three-dimensional flower-shaped cobalt disulfide / rGO composite material and its preparation method and application. The composite material is a mixed solution of a soluble cobalt salt aqueous solution and a vulcanizing agent aqueous solution at 150-280°C for heat preservation treatment Add the three-dimensional flower-like cobalt disulfide obtained after suction filtration and drying into the polydiallyldimethylammonium chloride solution and stir, and add the positively charged flower-like cobalt disulfide obtained after centrifugal washing into the GO aqueous solution and stir Then stand still, centrifuge and wash, freeze-dry, and heat up the obtained solid to 500-700°C for calcination under a protective atmosphere. The invention self-assembles the three-dimensional flower-shaped cobalt disulfide on the rGO nano sheet substrate through electrostatic interaction, can effectively accommodate the volume effect of the cobalt disulfide in the charging and discharging process, and has good electrical conductivity. The composite material has excellent charge-discharge cycle performance and rate performance and high first-time 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 Patents(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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