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A method for preparing carbon/germanium laminated composite negative electrode material by electrophoresis-electrodeposition

A negative electrode material, electrodeposition technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of high energy, strict equipment requirements, etc., to achieve the effect of alleviating volume changes, convenient operation, and improving stability

Active Publication Date: 2017-01-11
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are many methods for preparing germanium-based materials. Most of the literature reports are chemical vapor deposition, electron beam evaporation, magnetron sputtering, etc., but these methods require high energy and have strict requirements on equipment.

Method used

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  • A method for preparing carbon/germanium laminated composite negative electrode material by electrophoresis-electrodeposition
  • A method for preparing carbon/germanium laminated composite negative electrode material by electrophoresis-electrodeposition
  • A method for preparing carbon/germanium laminated composite negative electrode material by electrophoresis-electrodeposition

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Embodiment 1

[0034] (1) Dissolve 20mg of treated acetylene black or carbon nanotubes in 50ml of isopropanol, add 4mg of nickel nitrate to mix for ultrasonic dissolution, and conduct constant voltage electrophoretic deposition on the cleaned copper foil. The voltage of electrophoretic deposition is 100 V for 2 min; then dry to prepare acetylene black or carbon nanotube carbon film;

[0035] (2) Use 1-ethyl-3-methylimidazolium bistrifluorosulfonimide salt as the ionic liquid, distill off the water under reduced pressure before use, and treat it at 100°C for 12 hours; then prepare it to a concentration of 0.1mol / L GeCl 4 The ionic liquid electrolyte is stirred for 30min after preparation, and the GeCl 4 The purity is 99.998wt%;

[0036] (3) Electrodeposit germanium nanoparticle film on acetylene black or carbon nanotube carbon film in step (1) by ionic liquid electrodeposition method, use three-electrode system, and deposit in an anaerobic anaerobic glove box protected by argon , the water...

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Abstract

The invention discloses a method for preparing a carbon / germanium laminated composite negative electrode material through electrophoresis-electrodeposition. The method comprises the following steps of pretreating acetylene black or a carbon nano tube, then performing electrophoresis to form a carbon thin film on a copper foil, preparing a germanium-containing ionic liquid electrolyte, depositing a germanium nano particle thin film with high stability on the carbon thin film in a glove box, absorbing redundant ionic liquid, repeatedly cleaning deposits, and drying a carbon / germanium composite negative electrode material, and repeatedly and alternately depositing the acetylene black or carbon nano tube carbon thin film and the germanium nano particle thin film to obtain the carbon / germanium laminated composite negative electrode material. According to the method, the acetylene black or the carbon nano tube is compounded with the germanium nano particle thin film; under a condition that the carbon / germanium laminated composite negative electrode material is successfully prepared, the carbon thin film material and the germanium nano particle thin film are compounded together under room temperature, so that the carbon / germanium laminated composite negative electrode material with a cascaded structure and high performance is prepared. The method disclosed by the invention is simple in technology and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode composite negative electrode materials, and in particular relates to a method for preparing carbon / germanium laminated composite negative electrode materials by electrophoresis-electrodeposition. Background technique [0002] Lithium-ion batteries are widely used due to their high voltage, good cycle life, low self-discharge rate, no memory effect and low environmental pollution. At present, the anode materials of commercial lithium-ion batteries are generally graphite carbon materials, however, its theoretical specific capacity is only 372 mAhg. -1 , it is difficult to meet the development needs. The traditional carbon material is a stable negative electrode material as the lithium ion battery negative electrode material, however, its theoretical specific capacity is only 372 mAhg -1 , can not meet the requirements of use. Silicon and germanium, which are both group I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/362H01M4/38H01M4/587H01M10/0525Y02E60/10
Inventor 赵九蓬李垚张译文郝健
Owner HARBIN INST OF TECH
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