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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although this reaction can provide a high capacity, the rapid capacity decay is caused by the large volume change during the lithium-deintercalation process.

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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Effect test

Embodiment 1

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

[0035] The X-ray diffraction spectrum and transmission elect...

Embodiment 2

[0047] NiC 2 o 4 2H 2 O as raw material, dissolved in ethanol, prepared 80 ml with Ni 2+ A solution with a concentration of 0.04mol / L was added, and 87 mg of GO was added to obtain a mixed solution after fully stirring and dispersing; then Na 2 S (Na 2 The molar amount of S is NiC 2 o 4 2H 2 2 times of the molar weight) is added to the above mixed solution, and then trisodium citrate is added (the molar usage of trisodium citrate is NiC 2 o 4 2H 2 (2 times of the molar weight), then transferred to a capacity of 100 milliliters of autoclave (filling degree 80%, percent by volume), then the reactor was sealed, reacted at 220 ° C for 12 hours, naturally cooled to room temperature; Solid reaction product, the product was washed alternately and repeatedly with deionized water and absolute ethanol, and vacuum-dried at 60°C to obtain 0.32g NiS flake / graphene composite material, wherein the weight percentage of graphene was 10.7%.

[0048] It can be seen from the X-ray diffr...

Embodiment 3

[0060] With Ni(NO 3 ) 2 ·6H 2 O as a raw material, it is dissolved in ethylene glycol, and prepared into 80 ml with Ni 2+ The concentration is 0.06mol / L solution, then add 108 milligrams of GO and make mixed solution after fully stirring and dispersing; 3 ) 2 ·6H 2 (4 times of 2 molar weight) joins above-mentioned mixed solution, then adds trisodium citrate (the molar use amount of trisodium citrate is Ni(NO 3 ) 2 ·6H 2 (3 times of molar weight), then transferred to a capacity of 100 milliliters of autoclave (filling degree 80%, percent by volume), then the reactor was sealed, reacted at 170 ° C for 48 hours, naturally cooled to room temperature; Solid reaction product, the product was washed alternately and repeatedly with deionized water and absolute ethanol, and vacuum-dried at 60°C to obtain 0.47g NiS flake / graphene composite material, wherein the weight percentage of graphene was 9.1%.

[0061] It can be seen from the X-ray diffraction pattern and transmission ele...

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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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