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In-situ self-assembled nano-flower-like cobalt disulfide/rGO composite material and preparation method and application thereof

A technology of cobalt disulfide and composite materials, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of not fully displaying the value, and achieve excellent charge and discharge cycle performance, good Effects of cycle stability and excellent rate performance

Active Publication Date: 2019-08-23
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation of new lithium-ion composite materials, its special value has not been fully utilized
In particular, no studies have reported the in situ growth of cobalt disulfide nanoflower-like 3D Li-ion composites on 2D rGO nanosheets.

Method used

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  • In-situ self-assembled nano-flower-like cobalt disulfide/rGO composite material and preparation method and application thereof
  • In-situ self-assembled nano-flower-like cobalt disulfide/rGO composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Mix 5mmol CoSO 4 ·7H 2 O and 10mmol NaS were dissolved in 40mL deionized water respectively to obtain pink A solution and transparent B solution;

[0035]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;

[0036] 3. Weigh the aqueous solution containing 50 mg GO and add it to the C solution in step 2, stir for 30 minutes, and ultrasonically disperse for 10 minutes to obtain the GO mixed solution D;

[0037] 4. Pour the solution D described in step 3 into a 100mL stainless steel reaction kettle, then put it into a blast drying oven, keep it warm at 150°C for 36h, and then carry out suction filtration after cooling in the furnace to obtain solid D;

[0038] 5. After the solid D described in step 4 is placed in a freeze drying oven for drying, the in situ self-assembled nano flower-like cobalt disulfide / rGO composite material is obtained.

[0039] figure 1 It is a sca...

Embodiment 2

[0041] 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;

[0042] 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;

[0043] 3. Weigh the aqueous solution containing 30mg GO and add it to the C solution in step 2, stir for 30 minutes, and ultrasonically disperse for 10 minutes to obtain the GO mixed solution D;

[0044] 4. Pour the solution D described in step 3 into a 100mL stainless steel reaction kettle, then put it into a blast drying oven, keep it warm at 150°C for 36h, and then carry out suction filtration after cooling in the furnace to obtain solid D;

[0045] 5. After the solid D described in step 4 is placed in a freeze drying oven for drying, the in situ self-assembled nano flower-like cobalt disulfide / rGO composite material is obtained.

Embodiment 3

[0047] 1. Add 4mmol CoCl 2 ·6H 2 0 and 4mmol L-cysteine ​​were dissolved in 40mL deionized water respectively to obtain pink A solution and transparent B solution;

[0048] 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;

[0049] 3. Weigh the aqueous solution containing 40 mg GO and add it to the C solution in step 2, stir for 30 minutes, and ultrasonically disperse for 10 minutes to obtain the GO mixed solution D;

[0050] 4. Pour the solution D described in step 3 into a 100mL stainless steel reaction kettle, then put it into a blast drying oven, keep it warm at 150°C for 36h, and then carry out suction filtration after cooling in the furnace to obtain solid D;

[0051] 5. After the solid D described in step 4 is placed in a freeze drying oven for drying, the in situ self-assembled nano flower-like cobalt disulfide / rGO composite material is obtained.

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Abstract

The invention discloses an in-situ self-assembled nano-flower-like cobalt disulfide / rGO composite material and a preparation method and an application thereof. The in-situ self-assembled nano-flower-like cobalt disulfide / rGO composite material is obtained through steps that by adding GO solution to mixed solution of soluble cobalt salt solution and vulcanizing agent solution, and after stirring, ultrasonically, the obtained GO mixed solution is reacted in a stainless steel kettle at 150-280 DEG C, after cooling with the furnace, and the solid is obtained by freezing-drying treatment after suction filtration. The composite material has a nano-flower-like three-dimensional microstructure, nanoflowers are composed of single crystals of cobalt disulfide and grow in situ on a two-dimensional rGO nano sheet substrate, the substrate can effectively accommodate the volume effect of cobalt disulfide during charging and discharging and has good electrical conductivity, moreover, the composite material has excellent charging and discharging cycle performance and rate capability and can be applied in the field of lithium ion battery cathode materials.

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 in-situ self-assembled nano flower-like 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 conductivity / layered str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/5815H01M4/583H01M4/625H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 廖松义闵永刚刘屹东张诗洋王勇
Owner GUANGDONG UNIV OF TECH
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