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Coiling-type germanium nanomaterial and preparation method thereof

A technology of nanomaterials and coils, which is applied in the field of electrochemistry, can solve the problem that the volume expansion effect is not very obvious, and achieve the effects of short transmission length, improved work efficiency, and simple process steps

Active Publication Date: 2014-02-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the morphology of the direct electrodeposited film is nano-particles, and the role in alleviating volume expansion is not very obvious.

Method used

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  • Coiling-type germanium nanomaterial and preparation method thereof
  • Coiling-type germanium nanomaterial and preparation method thereof
  • Coiling-type germanium nanomaterial and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation of embodiment 1 coil shape germanium nanomaterial

[0021] The specific process for preparing coiled germanium nanomaterials is as follows: figure 1 As shown, the experimental part is mainly divided into two parts: ionic liquid electrodeposition experiment and annealing experiment.

[0022] 1. Electrodeposition of germanium and aluminum thin films by ionic liquid

[0023] (1) Pretreatment of experimental reagents

[0024] The ionic liquid EmimTf 2 N was placed in a glove box and distilled at 100°C for 24 hours to remove the moisture in the ionic liquid to make the water content less than 2ppm, and put it in the glove box for later use.

[0025] (2) Preparation of electrolyte

[0026] Prepare 0.1mol / L GeCl in the glove box 4 , 2.5mol / L AlCl3 EmimTf 2 N solution, after stirring evenly, was placed in the glove box for later use.

[0027] (3) Connect the electrolytic cell

[0028] The deposition experiment was carried out using a three-electrode syst...

Embodiment 2

[0035] Morphological characterization of embodiment 2 germanium nanomaterials

[0036] Through SEM characterization, we can intuitively see the microscopic morphology of the product, figure 2 The SEM image of the germanium-aluminum film electrodeposited by ionic liquid, we can see from the figure that the film directly electrodeposited is formed by the aggregation of small grains, from the EDS analysis ( image 3 ) It can be seen that the film mainly contains germanium and aluminum elements, of which a small amount of Cl, S, and F are the constituent elements of the ionic liquid, while the Ni element is the matrix material, and O and C are adsorbed during the preparation and characterization of the material. Yes, the O element may also be generated due to a small portion of the material being oxidized during the characterization process. However, after annealing, the morphology of the material has changed significantly due to the metal-induced effect. Figure 4 It is the SE...

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Abstract

The invention provides a coiling-type germanium nanomaterial and a preparation method thereof. The coiling-type germanium nanomaterial can be used as a negative electrode of a lithium ion battery. According to the preparation method, a metal layer prepared by adopting an ionic liquid electroposition method and a germanium layer are combined, and the coiling-type germanium nanomaterial is prepared by combining with a metal induced crystallization theory. The coiling-type germanium nanomaterial provided by the invention can be used as the negative electrode of the lithium ion battery, so that volume expansion of the germanium-based material can be effectively slowed down; the coiling-type germanium nanomaterial can be used for preparing the lithium ion power battery with high capacity, large multiplying power and long service life.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a germanium nanometer material and its preparation. Background technique [0002] Due to the small theoretical capacity of graphite-like carbon materials, only 373mAhg -1 , It is difficult to meet the development needs of aerospace, military industry, electric vehicles, etc. Therefore, finding lithium battery negative electrode materials with high theoretical capacity has become a research hotspot for lithium ion batteries. Up to 4200mAhg -1 , the theoretical capacity of the germanium negative electrode is as high as 1600mAhg -1 ) has become the best alternative material for graphite-based anode materials. However, due to the poor stability of the silicon negative electrode material. When lithium ions intercalate into silicon to form an intermetallic compound with silicon, its volume expansion can reach 400%. After the delithiation reaction, the silicon particles cannot be re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/38Y02E60/10
Inventor 赵九蓬郝健刘昕
Owner HARBIN INST OF TECH
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