Nickel sulfate sheet/graphene composite material as well as preparation method and application thereof

A composite material, nickel sulfide technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of capacity decay and large volume change, and achieve the effects of small size, simple process and good cycle stability

Inactive Publication Date: 2013-04-10
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although this reaction can provide a high capacity, the rapid capacity deca

Method used

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  • Nickel sulfate sheet/graphene composite material as well as preparation method and application thereof
  • Nickel sulfate sheet/graphene composite material as well as preparation method and application thereof
  • Nickel sulfate sheet/graphene composite material as well as preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[0033] Example 1

[0034] NiCl 2 ·6H 2 O as the raw material, dissolve it in deionized water, and make 80ml with Ni 2+ Calculate the solution with a concentration of 0.01 mol / L, then add 32 mg of GO and make a mixed solution after fully stirring and dispersing; then add thiourea (the molar amount of thiourea is NiCl 2 ·6H 2 3 times the molar amount of O) was added to the above mixed solution, and then added trisodium citrate (the molar amount of trisodium citrate is NiCl 2 ·6H 2 1 times the molar amount of O), then transfer to a 100 ml autoclave (filling degree 80%, volume percentage), then seal the reactor, react at 180°C for 24 hours, and cool to room temperature naturally; collect The solid reaction product is washed alternately and repeatedly with deionized water and absolute ethanol, and dried in vacuum at 60°C to obtain 0.085 g of NiS flake / graphene composite material, in which the weight percentage of graphene is 15.2%.

[0035] The X-ray diffraction pattern and transmission ...

Example Embodiment

[0046] Example 2

[0047] NiC 2 O 4 ·2H 2 O as the raw material, dissolve it in ethanol, and make 80ml with Ni 2+ Calculate the solution with a concentration of 0.04mol / L, then add 87 mg GO and make a mixed solution after fully stirring and dispersing; then add Na 2 S (Na 2 The molar amount of S is NiC 2 O 4 ·2H 2 2 times the molar amount of O) was added to the above mixed solution, and then added trisodium citrate (the molar usage of trisodium citrate is NiC 2 O 4 ·2H 2 2 times the molar amount of O), then transfer to a 100 ml autoclave (filling degree 80%, volume percentage), then seal the reactor, react at 220°C for 12 hours, and cool to room temperature naturally; collect The solid reaction product was washed alternately with deionized water and absolute ethanol, and dried under vacuum at 60°C to obtain 0.32 g of NiS flake / graphene composite material, in which the weight percentage of graphene was 10.7%.

[0048] It can be seen from the X-ray diffraction pattern and transmission...

Example Embodiment

[0059] Example 3

[0060] Ni(NO 3 ) 2 ·6H 2 O is the raw material, dissolve it in ethylene glycol, and make 80ml with Ni 2+ Calculate the solution with a concentration of 0.06 mol / L, then add 108 mg of GO and make a mixed solution after fully stirring and dispersing; then thioacetamide (the molar usage of thioacetamide is Ni(NO 3 ) 2 ·6H 2 4 times the molar amount of O) was added to the above mixed solution, and then added trisodium citrate (the molar amount of trisodium citrate is Ni(NO 3 ) 2 ·6H 2 3 times the molar amount of O), then transfer to a 100 ml autoclave (filling degree 80%, volume percentage), then seal the reactor, react at 170°C for 48 hours, and cool to room temperature naturally; collect The solid reaction product was washed alternately with deionized water and absolute ethanol, and dried in vacuum at 60° C. to obtain 0.47 g of NiS flake / graphene composite material, in which the weight percentage of graphene was 9.1%.

[0061] It can be seen from the X-ray diffracti...

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Abstract

The invention discloses a nickel sulfate sheet/graphene composite material as well as a preparation method and application thereof. The nickel sulfate sheet/graphene composite material comprises nanoscale nickel sulfate and graphene, wherein NiS takes a sheet shape. Nickel sulfate sheets in the composite materials can be evenly arranged due to the dispersing and bearing effects of the graphene and have small sizes, so that the stability and the circulating stability of the nickel sulfate in the charge and discharge process can be effectively improved, and the composite material can be used as a lithium ion battery cathode material. The preparation method of the composite material is a one-step low-temperature preparation method, has the advantages of simple technique, low cost, short circle, low energy consumption and the like, and is suitable for large-scale industrial production. The nickel sulfate sheet/graphene composite material can be used as the lithium ion battery cathode material.

Description

technical field [0001] The invention relates to the field of composite materials for lithium ion batteries, in particular to a nickel sulfide flake / graphene composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, and good safety performance. Therefore, they are widely used in portable electronic products such as digital cameras, mobile phones, and notebook computers. They also have application prospects for electric bicycles and electric vehicles. At present, commercial lithium-ion batteries generally use carbon-based negative electrode materials, such as graphite. Although this material has high stability, its theoretical capacity is only 372mAh·g -1 . [0003] Compared with carbon materials, some transition metal sulfides have higher theoretical capacity, such as NiS with a theoretical capacity of up to 589mAh g -1 . This type of transition ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/583
CPCY02E60/10
Inventor 谢健潘沁刘双宇赵新兵朱铁军曹高劭
Owner ZHEJIANG UNIV
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