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Graphene-bridged polythiophene-coated germanium nanoparticle composite material and its preparation method and application

A nanoparticle and composite material technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as capacity decay, limited development, electrode powder failure, etc., to improve capacity, improve Cycle performance, high conductivity improvement effect

Active Publication Date: 2021-10-01
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume change rate of germanium is as high as 300% in the process of lithium intercalation and deintercalation, which leads to electrode pulverization failure and rapid capacity decay, which limits its development.

Method used

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  • Graphene-bridged polythiophene-coated germanium nanoparticle composite material and its preparation method and application

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Embodiment 1

[0045] A germanium nanoparticle composite material coated with graphene bridged polythiophene of the present invention, such as figure 1 As shown, it is mainly composed of germanium nanoparticles, polythiophene and reduced graphene oxide, polythiophene is coated on the surface of germanium nanoparticles, and reduced graphene oxide is bridged to the polythiophene coated germanium nanoparticles. Polythiophene is specifically poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, abbreviated as PEDOT:PSS, in terms of mass fraction, the mass fraction of germanium nanoparticles is about 93.3%, and the content of PEDOT:PSS is 5.0 %, the content of reduced graphene oxide is about 1.7%.

[0046] In this embodiment, the particle size of the germanium nanoparticles is 1 nm˜50 nm.

[0047] A preparation method of the above-mentioned graphene-bridged polythiophene-coated germanium nanoparticle composite material of the present embodiment, comprising the following steps:

[0048] (1...

Embodiment 2

[0060] A germanium nanoparticle composite material coated with graphene bridged polythiophene of the present invention, such as figure 1 As shown, it is mainly composed of germanium nanoparticles, polythiophene and reduced graphene oxide, polythiophene is coated on the surface of germanium nanoparticles, and reduced graphene oxide is bridged to the polythiophene coated germanium nanoparticles. Polythiophene is specifically poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate PEDOT:PSS, in terms of mass fraction, the mass fraction of germanium nanoparticles is about 81.0%, and the content of PEDOT:PSS is 14.6%. The content of graphene oxide is about 4.4%.

[0061] In this embodiment, the particle size of the germanium nanoparticles is 1 nm˜50 nm.

[0062] A preparation method of the above-mentioned graphene-bridged polythiophene-coated germanium nanoparticle composite material of the present embodiment, comprising the following steps:

[0063] (1) Add 40 mL of 0.5M ammonia ...

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Abstract

The invention discloses a germanium nanoparticle composite material coated with graphene-bridged polythiophene and its preparation method and application. The composite material is mainly composed of germanium nanoparticle, polythiophene and reduced graphene oxide. Polythiophene is coated on germanium On the surface of the nanoparticles, reduced graphene oxide is bridged to the polythiophene coating the germanium nanoparticles. The preparation method includes the neutral GeO 2 Add reduced graphene oxide and a dispersant to the solution, and pour NaBH into the resulting solution A 4 The solution was stirred in a water bath to obtain solution B, and the precipitate obtained by suction filtration was calcined at a high temperature to obtain a Ge / RGO composite material. Add polythiophene aqueous solution to freeze, vacuum freeze-dry to remove moisture, and then vacuum dry at 100°C to 140°C to obtain a composite material. in lithium-ion batteries. The composite material of the invention has high energy density, good cycle stability, good rate performance, good composite uniformity, easy-to-obtain raw materials for the preparation method, simple process, and good commercial value and application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite materials for electrodes, and relates to a three-dimensional porous conductive polymer / germanium / carbon composite material and its preparation method and application, in particular to a graphene bridged polymer that can be used as a lithium ion battery negative electrode material. Thiophene-coated germanium nanoparticle composite material and its preparation method and application. Background technique [0002] With the rapid development of energy storage power supply and electric vehicles, higher requirements are placed on the performance of lithium-ion batteries, and the development of lithium-ion batteries with high energy density has become a research focus. [0003] At present, the commercial negative electrode materials are mainly carbon materials, which are divided into two types: amorphous carbon and graphitized carbon. Among them, the theoretical lithium intercalation cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/624H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 许静李德湛刘双科郑春满
Owner NAT UNIV OF DEFENSE TECH
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