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Tin oxide/tin/few-layer graphene composite material as well as preparation method and application thereof

A few-layer graphene, tin oxide technology, applied in nanotechnology for materials and surface science, electrochemical generators, electrical components, etc., can solve the problem of electrode material shedding, inability to obtain cycle performance, electrode material powder and other problems, to achieve the effect of low cost, excellent cycle performance and large powder output

Inactive Publication Date: 2017-02-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that when a single tin oxide is used as the negative electrode material of the sodium ion electrode, it will produce a huge volume expansion during the sodium intercalation process, resulting in the pulverization of the electrode material, causing the electrode material to fall off from the current collector, and failing to obtain good cycle performance.

Method used

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  • Tin oxide/tin/few-layer graphene composite material as well as preparation method and application thereof
  • Tin oxide/tin/few-layer graphene composite material as well as preparation method and application thereof
  • Tin oxide/tin/few-layer graphene composite material as well as preparation method and application thereof

Examples

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preparation example Construction

[0025] The preparation of the composite materials in each embodiment of the present invention adopts the dielectric barrier discharge plasma-assisted high-energy ball milling method.

[0026] The specific steps of the dielectric barrier discharge plasma-assisted high-energy ball milling method are:

[0027] (1) Install the front cover and the electrode rod of the ball mill, and connect the iron core inside the front cover and the electrode rod to the positive and negative poles of the plasma power supply respectively, wherein the iron core inside the electrode rod is connected to the plasma power supply The positive pole of the front cover is connected to the negative pole of the plasma power supply;

[0028] (2) Put the grinding balls and the mixed powder of tin powder and expanded graphite in the ball mill tank;

[0029] (3) Vacuum the ball mill tank through the vacuum valve, and then fill the discharge gas medium with oxygen or a mixture of oxygen and inert gas to make the...

Embodiment 1

[0035] Preparation of tin oxide / tin / few-layer graphene composites by dielectric barrier discharge plasma-assisted high-energy ball milling:

[0036] Put tin powder and expanded graphite raw material powder into a ball mill and mix them. The mass fraction of expanded graphite is 30%, and the mass ratio of ball powder to raw material is 50:1. Conduct dielectric barrier discharge plasma-assisted high-energy ball milling for 15 hours, discharge gas The medium is oxygen, and after discharge ball milling, a tin oxide / tin / few-layer graphene composite material is obtained.

[0037] The prepared composite material was made into a negative electrode sheet of a sodium ion battery and the battery was assembled, and then the charge and discharge test was carried out. SnO x The first reversible specific capacity of the / Sn / FLG composite is 255 mAh g -1 , after 250 cycles, the reversible specific capacity drops to 180mAh g -1 .

Embodiment 2

[0039] Same as Example 1, except that the discharge ball milling time is 20h.

[0040] After discharge ball milling, such as figure 1 Shown is the prepared SnO x / Sn / FLG composite XRD patterns, by figure 1 It can be seen that the composite material components include tin and tin oxide;

[0041] figure 2 are expanded graphite and the prepared SnO x / Sn / FLG composite material and the Raman diagram of commercial few-layer graphene, it can be seen from the figure that compared with expanded graphite, the D peak of the few-layer graphene corresponding to the carbon layer in the prepared composite material is weakened, and the G peak is enhanced. It shows the stripping of the carbon layer, and the shift of the G peak to the right indicates the thinning of the carbon layer; and compared with the commercial few-layer graphene, the Raman diagram of the few-layer graphene in the prepared composite is almost the same, indicating that After discharge ball milling, the expanded graph...

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Abstract

The invention discloses a tin oxide / tin / few-layer graphene composite material as well as a preparation method and application thereof. A structure of the composite material is that nano-crystalline tin oxide and nano-crystalline tin are uniformly covered in a few-layer graphene carbon matrix. The method comprises: adding tin powder and expanded graghite into a ball mill and mixing; then vacuumizing and filling a gas medium; carrying out ball milling by adopting a dielectric barrier discharge plasma assisted high-energy ball milling method, so as to obtain the tin oxide / tin / few-layer graphene composite material. The composite material provided by the invention is used as a negative electrode material of a sodium-ion battery and has high capacity and excellent circulating performance; when the composite material is charged and discharged under a current density of 100mAg<-1>, an initial specific capacity is 448mAhg<-1>; after the composite material is circulated for 250 times, the capacity of 370mAg<-1> is still kept. The preparation method is simple, low in cost and high in powder yield; large-scale production is prone to realize and pollution to the environment is not caused.

Description

technical field [0001] The invention relates to the field of negative electrode materials for sodium ion batteries, in particular to a tin oxide / tin / few-layer graphene composite material and its preparation method and application. Background technique [0002] Due to the advantages of high energy density and long cycle life, lithium-ion batteries are widely used as working power sources for various electronic products including mobile phones, notebook computers, and digital cameras, as well as power batteries for mobile equipment including electric vehicles. However, the global lithium resources are not abundant and the cost is high, which largely restricts the large-scale application of lithium-ion batteries. However, compared with lithium resources, sodium resources are very rich and low in cost, and the two are the same main group element with similar chemical properties. Therefore, using sodium instead of lithium to develop sodium-ion batteries has a very broad applicati...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/38H01M4/583H01M10/054B82Y30/00
CPCB82Y30/00H01M4/364H01M4/387H01M4/48H01M4/583H01M10/054Y02E60/10
Inventor 杨黎春程得亮胡仁宗欧阳柳章朱敏
Owner SOUTH CHINA UNIV OF TECH
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