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Preparation method of composite current collector and application of composite current collector in lithium ion flow battery

A flow battery, lithium ion technology, applied in the field of electrochemical applications, can solve the problem of high interface resistance

Inactive Publication Date: 2012-01-11
DALIAN LICHANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Professor Yet-Ming Chiang of MIT in the United States also reported a similar battery (Semi-Solid Lithium Rechargeable Flow Battery, Yet-Ming Chiang et al, Adv.Energy.Mater.2011, 1(4):511-516), However, it is reported that the current collectors used in the battery are aluminum sheets and copper sheets, and there are disadvantages such as high interface resistance during charging and discharging.

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  • Preparation method of composite current collector and application of composite current collector in lithium ion flow battery
  • Preparation method of composite current collector and application of composite current collector in lithium ion flow battery

Examples

Experimental program
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Embodiment 1

[0028] Embodiment 1: Preparation of carbon nanotube-copper flake composite collector:

[0029] (1) 2 grams of multi-walled carbon nanotubes were refluxed at 70° C. for 8 hours in 300 milliliters of sulfuric acid and nitric acid mixed solution (volume ratio 3: 1, purity respectively 96%, 70%), filtered, washed with deionized water, 100 ℃ vacuum (≤-0.01MPa) drying for 10 hours to obtain carbon nanotubes with carboxyl groups (-COOH) on the surface;

[0030] (2) Weigh 1 gram of carbon nanotubes with carboxyl groups (-COOH) on the surface, reflux in 100 ml of thionyl chloride at 78°C for 12 hours, evaporate the remaining thionyl chloride, and then add 80 ml of ethylenediamine Anhydrous toluene solution (concentration 0.02 g / ml) was reacted at 70°C for 25 hours, filtered, washed with ethanol and deionized water, and dried under vacuum (≤-0.01MPa) at 50°C for 23 hours to obtain 2 ) of carbon nanotubes.

[0031] (3) The above-mentioned carbon nanotubes with carboxyl (-COOH) and amin...

Embodiment 2

[0035] Embodiment 2: Preparation of carbon nanotube-aluminum flake composite current collector:

[0036] (1) 2 grams of multi-walled carbon nanotubes were refluxed at 75° C. for 10 hours in 300 milliliters of sulfuric acid and nitric acid mixed solution (volume ratio 3: 1, purity respectively 96%, 70%), filtered, washed with deionized water, 100 ℃ vacuum (≤-0.01MPa) drying for 6 hours to obtain carbon nanotubes with carboxyl groups (-COOH) on the surface;

[0037] (2) Weigh 1 gram of carbon nanotubes with carboxyl groups (-COOH) on the surface and reflux at 78°C in 100 ml of thionyl chloride for 10 hours, evaporate the remaining thionyl chloride, and then add 80 ml of ethylenediamine Anhydrous toluene solution (concentration 0.02 g / ml) was reacted at 70°C for 20 hours, filtered, washed with ethanol and deionized water, and dried under vacuum (≤-0.01MPa) at 50°C for 18 hours to obtain an amino group (-NH 2 ) of carbon nanotubes.

[0038] (3) The above-mentioned carbon nanotub...

Embodiment 3

[0042] Example 3: Application of Composite Current Collector in Lithium-ion Flow Batteries

[0043] The carbon nanotube-copper sheet composite collector prepared in Example 1 is the negative electrode collector, the carbon nanotube-aluminum sheet composite collector prepared in Example 2 is the positive electrode collector, and the polypropylene film Celgard 2500 is used as the negative electrode collector. The lithium ion separator, the width of the positive and negative electrode chambers are 3 mm, and related components are assembled into an electrochemical device according to the attached drawings.

[0044] Preparation of positive electrode slurry: under anhydrous, oxygen-free helium atmosphere, 10 g of LiCoO 2 (D50=3um), 1g conductive carbon (Ketjen ECP600JD), 1.2M LiPF 6 About 120 ml of the ethylene carbonate-dimethyl carbonate (3:7) solution was mixed together and sonicated for 30 minutes to form a slurry with a solid-to-liquid volume ratio of 20%.

[0045] Preparatio...

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Abstract

The invention relates to a preparation method of a composite current collector combined by carbon nanotube thin layers and a copper sheet or an aluminium sheet, and application of the composite current collector in a lithium ion flow battery. The method comprises the steps of: functionalizing a carbon nanotube so as to make the carbon nanotube having carboxyl or amino groups, depositing the carbon nanotube thin layers on the copper sheet or aluminium sheet through a layer-by-layer self-assembly method under anion-cation interaction, then compacting the deposited copper sheet or aluminium sheet, and carrying out high temperature treatment in a reducing atmosphere, thus obtaining the composite current collector. With the composite current collector, an ion diaphragm, semisolid flow slurries formed by positive and negative electrode active materials in a lithium ion-containing organic solvent, a novel lithium ion flow battery can be assembled. Compared with a single copper sheet or aluminium sheet current collector, the composite current collector of the invention has the advantages of good electronic conductivity and small internal resistance. Compared with traditional lithium ion batteries and flow batteries, the lithium ion flow battery provided in the invention has the advantages of convenient electrode material replacement and high specific energy, thus boasting tremendous application prospects in power and energy storage battery fields.

Description

technical field [0001] The invention relates to a preparation method of a composite current collector formed by combining a carbon nanotube thin layer with a copper sheet or an aluminum sheet and the application of the composite current collector in a lithium ion flow battery, belonging to the technical field of electrochemical applications. Background technique [0002] Since the commercialization of lithium-ion secondary batteries in the 1990s, the market application of lithium-ion batteries has developed rapidly, and it has now become the most important power source for consumer electronics. In recent years, with the research and development of electric vehicle power batteries and energy storage batteries for wind energy and solar power generation, lithium-ion batteries are considered to be one of the battery options for large-scale application in the field of power and energy storage in the future due to their excellent characteristics. [0003] The existing lithium-ion ...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M8/18
CPCY02E60/528Y02E60/10Y02E60/50
Inventor 耿世达陈杨英
Owner DALIAN LICHANG NEW MATERIAL CO LTD
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