Transition metal sulfide/graphene composite material, and preparation method and application thereof

A transition metal and composite material 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 particle size, simple process and low energy consumption

Inactive Publication Date: 2012-10-31
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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  • Transition metal sulfide/graphene composite material, and preparation method and application thereof
  • Transition metal sulfide/graphene composite material, and preparation method and application thereof
  • Transition metal sulfide/graphene composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] with CoCl 2 ·6H 2 O as a raw material was dissolved in deionized water to prepare 80 ml of Co 2+ The concentration is 0.015mol / L solution, then add 45 mg GO and make mixed solution after fully stirring and dispersing; 2 ·6H 2 (2 times of molar weight) joins above-mentioned mixed solution, then transfers to capacity and is in the autoclave (filling degree 80%, percent by volume) of 100 milliliters, then reactor is sealed, reacts 24 hours at 180 ℃, naturally Cool to room temperature; collect the solid reaction product, wash the product alternately and repeatedly with deionized water and absolute ethanol, and dry it under vacuum at 60°C to obtain 0.16g CoS 2 / graphene composite material, wherein the weight percentage of graphene is 10.6%.

[0036] The X-ray diffraction spectrum and transmission electron microscope photograph of the composite material of gained are respectively as follows figure 1 and figure 2 , it can be seen that the obtained composite material is ...

Embodiment 2

[0039] FeC 2 o 4 2H 2 O is the raw material, which is dissolved in ethylene glycol and prepared into 80 ml of Fe 2+ A solution with a metered concentration of 0.03mol / L, and then add 42 mg of GO to prepare a mixed solution after fully stirring and dispersing; then add Na 2 S (the amount used is FeC 2 o 4 2H 2 (2.5 times of molar weight) joins above-mentioned mixed solution, then transfers to capacity and is in the autoclave (filling degree 80%, percent by volume) of 100 milliliters, then reactor is sealed, reacts 12 hours at 220 ℃, naturally Cool to room temperature; collect the solid reaction product, wash the product alternately and repeatedly with deionized water and absolute ethanol, and dry it under vacuum at 60°C to obtain 0.23g FeS / graphene composite material, wherein the weight percentage of graphene is 7.2 %.

[0040] It can be seen from the X-ray diffraction pattern and the transmission electron microscope photo of the obtained composite material that the obta...

Embodiment 3

[0043] With Mn(NO 3 ) 2 4H 2 O is the raw material, which is dissolved in absolute ethanol to make 80 ml of Mn 2+ A solution with a concentration of 0.09mol / L was added, and then 85 mg of GO was added to obtain a mixed solution after fully stirring and dispersing; then CS 2 (Use amount is Mn(NO 3 ) 2 4H 2 (3 times of molar weight) joins above-mentioned mixed solution, then transfers to capacity and is in the autoclave (filling degree 80%, percent by volume) of 100 milliliters, then reactor is sealed, reacts 48 hours at 170 ℃, naturally Cool to room temperature; collect the solid reaction product, wash the product alternately and repeatedly with deionized water and absolute ethanol, and dry it under vacuum at 60°C to obtain 0.89g MnS 2 / graphene composite material, wherein the weight percentage of graphene is 3.8%.

[0044] It can be seen from the X-ray diffraction pattern and transmission electron microscope photo of the composite material obtained that the composite ma...

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Abstract

The invention discloses a transition metal sulfide / graphene composite material which is composed of a nano transition metal sulfide and graphene, wherein the transition metal sulfide is Ni2S3, NiS, FeS, FeS2, CoS, CoS2, CuS2, CuS, MnS or MnS2. Under the dispersion and loading actions of the graphene, the transition metal sulfide can be uniformly distributed and have small particle size, the stability and loop stability of the transition metal sulfide in the charging and discharging process can be effectively enhanced, and the composite material can be used as a lithium ion battery negative pole material. The invention also discloses a one-step low-temperature preparation method of the composite material, which has the advantages of simple technique, low cost, short cycle, low energy consumption and the like and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of composite materials for lithium ion batteries, in particular to a transition metal sulfide / 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 transit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 赵新兵潘沁谢健刘双宇郑云肖宋文涛朱铁军曹高劭
Owner ZHEJIANG UNIV
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