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Stannic selenide/graphene nanoplatelet composite material as well as preparation method and application thereof

A few-layer graphene, composite material technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems affecting the electrochemical performance of materials, electrode material shedding, electrode material pulverization, etc., to achieve easy mass production, cost Low, improve the effect of ion transport and electronic conduction

Inactive Publication Date: 2018-08-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single tin selenide is used as the lithium / sodium ion electrode negative electrode material, which will produce a huge volume expansion during the lithium / sodium intercalation process, resulting in the pulverization of the electrode material, causing the electrode material to fall off from the current collector, and affecting the electrical conductivity of the material. chemical properties

Method used

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  • Stannic selenide/graphene nanoplatelet composite material as well as preparation method and application thereof
  • Stannic selenide/graphene nanoplatelet composite material as well as preparation method and application thereof
  • Stannic selenide/graphene nanoplatelet composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add tin powder, selenium powder and expanded graphite raw material powder into the ball mill tank and mix, wherein the mass fraction of expanded graphite is 30%, the molar ratio of tin powder and selenium powder is 1:1, and the ball powder mass ratio of grinding balls to raw materials is 50% : 1, conduct dielectric barrier discharge plasma-assisted high-energy ball milling for 10 hours, the discharge gas medium is argon, and the pressure in the tank is 0.1Mpa. After ball milling, a tin selenide / few-layer graphene composite was obtained.

[0035] Among them, the dielectric barrier discharge plasma-assisted high-energy ball milling steps in this embodiment are:

[0036] (1) In the ball mill jar, load grinding balls and proportioned tin powder, selenium powder and expanded graphite;

[0037] (2) Vacuumize the ball mill tank by a vacuum pump, then fill in the discharge gas medium such as argon, helium or a mixture of inert gases, so that the pressure in the ball mill tank ...

Embodiment 2

[0045] The difference from Example 1 is that the ball milling time is 20h.

[0046] After ball milling, tin and selenium react to form tin selenide, the XRD picture is as follows figure 1 shown. SEM figure and HRTEM figure of the tin selenide / few-layer graphene composite material prepared in the present embodiment are respectively as follows figure 2 and image 3 shown by figure 2 and image 3 It can be seen that nanocrystalline tin selenide is uniformly coated in few-layer graphene.

[0047] The composite material prepared in this embodiment is made into the negative electrode sheet of lithium ion battery and the battery is assembled at 0.2A g -1 The rate of charge and discharge is between 0 and 2.5V, such as Figure 4 As shown, the first discharge specific capacity is 1360mAh g -1 , the specific capacity of the first charge is 868mAh g -1 , the first Coulombic efficiency is 63.8%, and after 200 cycles, the capacity is still 830mAh g -1 . High rate charge and discha...

Embodiment 3

[0050] The difference from Example 2 is that the ball milling time is 30h. After ball milling, a tin selenide / few-layer graphene composite was obtained.

[0051] The composite material prepared in this embodiment is made into the negative electrode sheet of lithium ion battery and the battery is assembled at 0.2A g -1 The charge-discharge cycle is carried out between 0 and 2.5V, and the first reversible specific capacity of SnSe@FLG is 766.5mAh g -1 , after 200 cycles, the reversible specific capacity dropped to 596.8mAh g -1 .

[0052] The prepared composite material was made into a negative electrode sheet of a sodium ion battery and the battery was assembled at 0.2A g -1 The charge-discharge cycle is carried out between 0 and 3V, and the first reversible specific capacity of SnSe@FLG is 396.5mAh g -1 , after 200 cycles, the reversible specific capacity dropped to 308.6mAh g -1 .

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Abstract

The invention discloses a preparation method of a stannic selenide / graphene nanoplatelet composite material. The method comprises the following steps: adding tin powder, selenium powder and expanded graphite to a ball milling tank, and mixing to obtain mixed powder; performing ball milling according to a dielectric barrier discharge and plasma assisting high-energy ball milling method to obtain the stannic selenide / graphene nanoplatelet composite material, wherein the molar ratio of the tin powder to the selenium powder is 1:1; the mixed powder comprises 10-70% by mass of expanded graphite; the ball milling is performed for 10-30h. The invention further discloses the stannic selenide / graphene nanoplatelet composite material and application thereof. The stannic selenide / graphene nanoplatelet composite material is high in capacity, and outstanding in circulating performance and multiplying performance. The preparation method is simple; the cost is low; massive production is facilitated .

Description

technical field [0001] The invention relates to lithium / sodium ion battery negative electrode materials, in particular to a tin selenide / 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. With the wide application of lithium-ion batteries, on the one hand, people have put forward higher requirements for the performance of lithium-ion batteries, including higher capacity, greater power, and longer cycle life. At present, the widely used commercial lithium-ion battery anode materials are mainly graphite carbon materials, whose theoretical specific capacity is low and cannot meet the development needs of high-capacity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/366H01M4/58H01M4/625Y02E60/10
Inventor 朱敏杨黎春程得亮胡仁宗刘军
Owner SOUTH CHINA UNIV OF TECH
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