Method for preparing three-dimensional germanium/carbon nano composite film through ionic liquid electrodeposition

A technology of carbon nanocomposite and ionic liquid, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of reducing the cycle performance and rate performance of lithium-ion batteries, and achieve stress relief and enhancement The effect of cycle performance and good structural stability

Inactive Publication Date: 2015-09-09
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problem that the pulverization of the germanium negative electrode material of the existing lithium-ion battery during the charging and discharging process will reduce the cycle performance and rate performance of the lithium-ion battery, and provide a three-dimensional Germanium / carbon nanocomposite film method

Method used

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  • Method for preparing three-dimensional germanium/carbon nano composite film through ionic liquid electrodeposition
  • Method for preparing three-dimensional germanium/carbon nano composite film through ionic liquid electrodeposition
  • Method for preparing three-dimensional germanium/carbon nano composite film through ionic liquid electrodeposition

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specific Embodiment approach 1

[0023] Specific Embodiment 1: This embodiment is a method for preparing a three-dimensional germanium / carbon nanocomposite film by electrodeposition of ionic liquid, which is specifically carried out according to the following steps:

[0024]1. Electrophoretic deposition: Dissolve acetylene black in isopropanol, add nickel nitrate, and then perform ultrasonic mixing for 6 hours to obtain an acetylene black solution; use clean nickel foam as the anode, copper foil as the cathode, and acetylene black solution as the electrophoresis solution , carry out constant voltage electrophoretic deposition for 2min, and then dry at a temperature of 70°C for 4h to obtain a three-dimensional carbon network; the voltage of the constant voltage electrophoretic deposition is 100V; the quality of the acetylene black is the same as that of isopropanol Volume ratio is 1mg:(2mL~2.5mL); The mass ratio of described acetylene black and nickel nitrate is 1:(0.1~0.3);

[0025] 2. Preparation of ionic li...

specific Embodiment approach 2

[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the preparation method of clean nickel foam in step 1: use the HCl solution ultrasonic cleaning foam nickel 5min of 0.5mol / L with concentration, then use ethanol and supernatant successively The nickel foam was ultrasonically washed with pure water for 10 minutes each, and dried for 2 hours at a temperature of 70° C. to obtain clean nickel foam. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt is distilled in a glove box for 24h , to obtain distilled 1-ethyl-3-methylimidazole bis-trifluoromethanesulfonylimide salt. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method for preparing a three-dimensional germanium/carbon nano composite film through ionic liquid electrodeposition, which relates to the method for preparing the germanium/carbon nano composite film. The method solve the technical problem that the circularity and multiplying power performance of a lithium ion battery are reduced during a charge and discharge process by a germanium cathode material of the current lithium ion battery. The method comprises the following steps: 1)electrophoretic deposition; 2)preparation of an ionic liquid electrodeposition liquid; 3)constant potential deposition; and 4)cleaning and drying. The prepared three-dimensional germanium/carbon nano composite film can effectively enhance the combination force between an active material and a current collector, volume expansion of the active material is reduced, transmission rate of the lithium ion and electron in the cathode material are increased, and the cycle performance, multiplying power performance and safety performance of the lithium ion battery are effectively increased.

Description

technical field [0001] The invention relates to a method for preparing a germanium / carbon nanometer composite film. Background technique [0002] Ionic liquids are organic salts composed of cations and anions that are liquid at room temperature. They have extremely low vapor pressure, good chemical stability, non-flammability, wide electrochemical window, good heat resistance, and no environmental pollution. Advantages, using it as an electrolyte for electrodeposition can avoid the huge environmental pollution caused by strong acid and alkali in traditional water system electrodeposition. At the same time, compared with the traditional aqueous electrodeposition, the ionic liquid electrodeposition can improve the conductivity, which is beneficial to the deposition of semiconductors, and the deposition product is uniform and compact, and has better mechanical properties. At the same time, the ionic liquid electrodeposition can control the coating by controlling the current and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/02C25D3/54C25D5/54H01M4/36B82Y30/00
CPCY02E60/10
Inventor 赵九蓬郝健李垚
Owner HARBIN INST OF TECH
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