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Negative material SnOxS2-x/graphene composite for lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc. The whole process is reversible, the cycle stability and the specific capacity are low, so as to improve the electrochemical activity, reduce the polarization effect and enhance the reversibility.

Active Publication Date: 2014-11-19
SHANGHAI SINOPOLY JIAHUA BATTERY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pure phase SnO 2 or SnS 2 The composite with graphene can greatly improve the cycle stability and rate performance of the material, but it still cannot realize the full reversibility of the electrochemical process, and its specific capacity is still limited by the irreversibility of reaction 1, which can only approach the theoretical reversible ratio of reaction 2. capacity
For example: SnO reported by Xuyang Wang et al. 2 Nanoparticles / graphene composites have good cycle stability, but their specific capacity and rate performance are poor. At current densities of 64, 400 and 1000mA / g, the reversible capacities after multiple (30-50) cycles are 840, 590 and 270mAh / g (Carbon.49(2011) 133-139); Xu et al prepared graphene composites with sparse nanorods (C.Xu, et.al., J Mater Chem, 22 (2012) 975.) The cycle stability and specific capacity are also low, and only 574.6mAh / g specific capacity is retained after 50 cycles at a current density of 200mA / g; the graphene / SnS prepared by Bin Luo et al. 2 The specific capacity can only reach 650mAh / g
In short, simply reducing the size of the active material and compounding with graphene to enhance the conductivity cannot greatly improve the reversibility of tin-based oxo compounds.

Method used

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  • Negative material SnOxS2-x/graphene composite for lithium ion battery and preparation method thereof
  • Negative material SnOxS2-x/graphene composite for lithium ion battery and preparation method thereof
  • Negative material SnOxS2-x/graphene composite for lithium ion battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0049] Disperse 0.3 parts (by weight, g) of graphene oxide into 20 parts of deionized water under the action of ultrasonic waves, and form a hydrogel dispersion after ultrasonic treatment for 30 minutes. Then add 100 parts of pre-configured molar concentrations of 0.05M SnCl 4 and 0.2M thioacetamide mixed solution. After stirring for 30 minutes, sonicate for another 90 minutes. The treated reaction solution was vacuum filtered, rinsed with 10 parts of 50% hydrazine hydrate, and finally washed with deionized water until neutral. After the filter cake is dried, SnO can be obtained x S 2-x / graphene composite.

[0050] From SnO x S 2-x / XRD spectrum of the graphene composite ( figure 1 ) shows that the main diffraction peaks of the product are similar to those of cassiterite-type SnO 2 (JCPDS No.77-451); at the same time, the weak diffraction peak at 23.2° should be attributed to the (002) plane of graphene. The thermogravimetric diagram of the composite ( figure 2 ) ...

Embodiment 2

[0063] Disperse 0.2 parts of graphene oxide into 20 parts of deionized water under the action of ultrasonic waves, and form a hydrogel dispersion after ultrasonic treatment for 30 minutes. Then add 100 parts of pre-configured molar concentrations of 0.05M SnCl 4 and 0.2M thioacetamide mixed solution. After stirring for 30 minutes, sonicate for another 90 minutes. The treated reaction solution was vacuum filtered, rinsed with 10 parts of 50% hydrazine hydrate, and finally washed with deionized water until neutral. After the filter cake is dried, SnO can be obtained x S 2-x / graphene composite.

[0064] From SnO x S 2-x / XRD spectrum of the graphene composite ( Figure 7 ) It can be seen that the diffraction peaks of the obtained composites are all trigonal chalchite SnS 2 (JCPDS No.23-667) characteristic diffraction peaks, no graphene, SnO2 Or the diffraction peaks of other tin-based sulfides. The possible reasons for not detecting the graphene (002) surface character...

Embodiment 3

[0070] Disperse 0.02 parts of graphene oxide into 10 parts of deionized water under the action of ultrasonic waves, and after ultrasonic treatment for 5 minutes, a hydrogel dispersion liquid is formed. Then add 100 parts of pre-configured molar concentrations of 0.05M SnCl 4 and 0.2M thioacetamide mixed solution. Sonicate for an additional 90 minutes without agitation. The treated reaction liquid was vacuum filtered, rinsed with 10 parts of 10% (weight ratio) aqueous ascorbic acid solution, and finally washed with deionized water until neutral. After the filter cake is dried, SnO can be obtained x S 2-x / graphene composite. The graphene content in the composite is 4.8%, and the ratio of S and O is 1:19, that is, X=0.1, from Figure 13 It can be seen that SnO x S 2-x It is a nanosheet with a diameter of 200-300; the obtained composite has a specific capacity of 526mAh / g after 40 cycles at a current density of 0.2A / g.

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Abstract

The invention relates to a negative material SnOxS2-x / graphene composite for a lithium ion battery and a preparation method of the negative material SnOxS2-x / graphene compositein the technical field of batteries. The composite comprises graphene and SnOxS2-x nanoparticles; the SnOxS2-x nanoparticles are uniformly distributed between graphene sheet layers, wherein x is ranged from 0.1 to 1.9. The graphene in the composite is of 4.8 to 91.3% by mass fraction; and the particle diameter of SnOxS2-x nanoparticles ranges from 3 to 300nm. The invention also discloses a preparation method of the composites. The composite material prepared by the preparation method provided by the invention is stable in performance; the composite can be used as the negative electrode of the lithium ion battery, and is high in reversible specific capacity.

Description

technical field [0001] The invention relates to an electrode material in the field of battery technology and a preparation method thereof, in particular to a SnO x S 2-x / Graphene composite negative electrode material and preparation method thereof. Background technique [0002] Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion batteries have the advantages of high energy density, large specific capacity, long cycle life, and environmental friendliness. They are widely used in mobile phones, notebook computers, digital cameras, and digital video cameras. has been widely applied. At present, the performance of lithium-ion batteries can better meet the needs of small electrical appliances, but in the application of electric vehicles and energy storage devices, lithium-ion batteries still face huge challenges. Therefore, the development of high-performance active materials for lithium-ion batteries is crucial to the devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01M4/58H01M4/136B82Y30/00
CPCY02E60/122Y02E60/10
Inventor 宰建陶李波韩倩琰肖映林钱雪峰马紫峰
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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