Application of a germanium-gallium nanowire as an electrode material for lithium-ion batteries

A lithium-ion battery, electrode material technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve problems such as poor electrochemical performance

Active Publication Date: 2020-06-19
吉林省东驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these two methods are effective in synthesizing Ge nanowires, they also have some inherent disadvantages, such as the requirement for high temperature or low pressure; moreover, these two methods usually use refined and expensive toxic semiconductor precursors.
The electrochemical liquid-liquid-solid (EC LLS) method is a new method to electrodeposit germanium nanowires directly from aqueous solution, using liquid metal nanodroplets as seeds for ultramicroelectrodes and crystal growth; however, the obtained Electrodeposited nanowires have poor electrochemical performance as electrode materials

Method used

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  • Application of a germanium-gallium nanowire as an electrode material for lithium-ion batteries
  • Application of a germanium-gallium nanowire as an electrode material for lithium-ion batteries
  • Application of a germanium-gallium nanowire as an electrode material for lithium-ion batteries

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preparation example Construction

[0035] In the present invention, the preparation method of the germanium gallium nanowire preferably includes the following steps:

[0036] In an environment where the water oxygen content is lower than 2ppm, the GaCl 3 、GeCl 4 Mixed with ionic liquid to obtain electrolyte;

[0037] Using a three-electrode electrochemical system including a working electrode, a counter electrode and a reference electrode, the electrolyte is deposited at a constant voltage of gallium under the conditions of 55 to 65°C and -1.0 to -1.5V, and on the surface of the working electrode Gain gallium deposits; continue to electrodeposit germanium at a constant voltage under the conditions of 55-65°C and -1.8-2.2V, and obtain germanium-gallium nanowires on the surface of the working electrode.

[0038] In the present invention, the germanium-gallium nanowires are preferably prepared in an environment with a water and oxygen content lower than 2 ppm. In the present invention, the germanium gallium nan...

Embodiment 1

[0060] In a glove box filled with argon and with water and oxygen content lower than 2ppm, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIm]Tf 2 N) The ionic liquid was vacuum distilled at 100°C for 24h, and the resulting ionic liquid was mixed with GaCl 3 (99.999%) and GeCl 4 (99.9999%) mixed, stirred at 500rpm at room temperature for 12h to obtain 1mol / L GaCl 3 Electrolyte and 1mol / L GeCl 4 electrolyte;

[0061] Clean the Cu substrate with acetone and isopropanol in turn, and then soak it in 10% hydrochloric acid for 1 min to remove the surface oxides. The Cu substrate is used as the working electrode, the silver wire is used as the reference electrode, and the platinum sheet is used as the counter electrode. Utilize a polytetrafluoroethylene electrolytic cell to limit the deposition area to 1.5cm 2 , using 2273 electrochemical workstation (Princeton Applied Research) to heat GaCl to 60 ° C 3 Electrolyte and GeCl 4 Electrolyte solution carries out c...

Embodiment 2

[0064] figure 2 It is a schematic diagram of the process of depositing germanium gallium nanowires on a Cu substrate, and the specific steps are as follows:

[0065] In a glove box filled with argon and with water and oxygen content lower than 2ppm, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIm]Tf 2 N) The ionic liquid was vacuum distilled at 100°C for 24h, and the resulting ionic liquid was mixed with GaCl 3 (99.999%) and GeCl 4 (99.9999%) mixed, stirred at 500rpm at room temperature for 12h to obtain GaCl 3 concentration and GeCl 4 Electrolyte with a concentration of 1mol / L;

[0066] Clean the Cu substrate with acetone and isopropanol in sequence, and then soak it in 10% hydrochloric acid for 1 min to remove the surface oxides. The Cu substrate is used as the working electrode, the silver wire is used as the reference electrode, and the platinum sheet is used as the counter electrode. Utilize a polytetrafluoroethylene electrolytic cell to limit t...

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Abstract

The invention provides an application of a gallium-germanium nanowire as a lithium ion battery electrode material. The gallium-germanium nanowire comprises a simple substance germanium and a simple substance gallium, and an atomic ratio of the simple substance germanium to the simple substance gallium in the gallium-germanium nanowire is (4-9):1. The gallium-germanium nanowire as the electrode material of a lithium ion battery can improve the cell cycle performance and multiplying power performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to the application of a germanium gallium nanowire as an electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have become the most important energy sources in portable devices and industrial energy storage systems due to their long cycle life, low self-discharge rate, and high operating voltage. However, the low energy density of about 150 Wh / kg is a challenge to meet the demands of future mobile devices. Since the graphite anode has a low reversible capacity of only 372mAh / g, it has become a worldwide hotspot to replace graphite with materials such as silicon, germanium, tin, and antimony to develop high-capacity lithium alloy anodes. Among them, silicon and germanium have become promising materials because of their theoretical capacities of 4200mAh / g and 1600mAh / g respectively. However, the common disadvantage of silicon an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/1395H01M4/04H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/0452H01M4/1395H01M4/38H01M10/0525Y02E60/10
Inventor 于兆亮孟祥东王多李海波孙萌尹默袁梦
Owner 吉林省东驰新能源科技有限公司
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