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Tin sulfide/sulfur/less-layer graphene composite material and preparation method and application thereof

A few-layer graphene and composite material technology, applied in the field of new energy materials, can solve the problems of electrode material pulverization, inability to obtain electrochemical performance, electrode material shedding, etc., to improve electronic conductivity, high capacity cycle performance and rate. Performance, low cost effect

Active Publication Date: 2017-11-03
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 a single tin sulfide as the lithium / sodium ion electrode negative electrode material will produce a huge volume expansion during the lithium / sodium intercalation process, which will lead to the pulverization of the electrode material and make the electrode material fall off from the current collector. to obtain good electrochemical performance

Method used

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  • Tin sulfide/sulfur/less-layer graphene composite material and preparation method and application thereof
  • Tin sulfide/sulfur/less-layer graphene composite material and preparation method and application thereof
  • Tin sulfide/sulfur/less-layer graphene composite material and preparation method and application thereof

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preparation example Construction

[0036] 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.

[0037] The specific steps of the dielectric barrier discharge plasma-assisted high-energy ball milling method are:

[0038] (1) Install the front cover and electrode rod of the ball mill, and connect the iron core in the front cover and electrode rod to the positive and negative poles of the plasma power supply respectively, wherein the iron core in 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;

[0039] (2) In the ball milling tank, load grinding balls and proportioned tin powder, sulfur powder and expanded graphite mixed powder;

[0040] (3) Vacuumize the ball mill tank through a vacuum valve, then fill in the discharge gas medium such as argon, helium or a mixture of inert gases, so ...

Embodiment 1

[0047] Put tin powder, sulfur powder and expanded graphite raw material powder into a ball mill and mix them, wherein the mass fraction of expanded graphite is 30%, the molar ratio of tin powder and sulfur powder is 1:1, and the ball powder mass ratio of grinding balls to raw materials is 50% : 1, carry out dielectric barrier discharge plasma-assisted high-energy ball milling for 20h, and the discharge gas medium is argon.

[0048] After discharge ball milling, a stannous sulfide / few-layer graphene composite was obtained.

[0049] The prepared composite material was made into the negative electrode sheet of lithium-ion battery and the battery was assembled at 1A g -1 The charge-discharge cycle is carried out between 0 and 3V, and the first reversible specific capacity of the SnS / FLG composite is 746.5mAh g -1 , after 250 cycles, the reversible specific capacity dropped to 588mAh g -1 .

[0050] The prepared composite material was made into the negative electrode sheet of so...

Embodiment 2

[0052] The difference from Example 1 is that the molar ratio of tin powder and sulfur powder is 1:2.

[0053] After discharge ball milling, tin reacts with sulfur to form stannous sulfide and tin sulfide, resulting in tin sulfide / few-layer graphene composites.

[0054] The prepared composite material was made into the negative electrode sheet of lithium-ion battery and the battery was assembled at 1A g -1 The rate of charge and discharge cycle between 0 ~ 3V, SnS x The first reversible specific capacity of the / FLG composite is 924.5 mAh g -1 , after 250 cycles, the reversible specific capacity dropped to 708mAh g -1 .

[0055] The prepared composite material was made into the negative electrode sheet of sodium-ion battery and the battery was assembled at 1A g -1 The rate of charge and discharge cycle between 0 ~ 3V, SnS x The first reversible specific capacity of the / FLG composite is 560.9 mAh g -1 , after 200 cycles, the reversible specific capacity dropped to 508.6mA...

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Abstract

The invention discloses a tin sulfide / sulfur / less-layer graphene composite material and a preparation method and application thereof. The preparation method comprises the following steps of adding tine powder, sulfur powder and expanded graphite into a ball-milling tank, performing mixing, and performing ball-milling by employing dielectric barrier discharge plasma assisted with a high-efficiency ball-milling method to obtain the tin sulfide / sulfur / less-layer graphene composite material, wherein in a mixture of the tin powder, the sulfur powder and the expanded graphite, the mass percent of the expanded graphite accounts for 20-80%, the mole ratio of the tin powder and the sulfur powder is (1:1)-(1:4), the ball material ratio of ball milling is (30:1)-(70:1), and the ball-milling time is 10-40 hours. The composite material shows excellent electrochemical performance when used as a lithium / sodium ion battery negative material and has high capacity, excellent cycle property and rate performance. The composite material has the advantages of wide raw material source, low cost and no pollution to an environment, the preparation method is simple, and production on a large scale is easy.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a tin sulfide / sulfur / few-layer graphene composite material and its preparation method and application in lithium / sodium ion batteries. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M4/38H01M10/0525H01M10/054
CPCH01M4/366H01M4/387H01M4/5825H01M4/583H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 朱敏程得亮杨黎春胡仁宗曾美琴鲁忠臣
Owner SOUTH CHINA UNIV OF TECH
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