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CNT (Carbon Nano Tube)/SnO2 coaxial composite array lithium ion battery negative electrode material

A technology for carbon nanotube arrays and lithium-ion batteries, which can be applied to battery electrodes, secondary batteries, circuits, etc., and can solve the problems of complex manufacturing processes of button batteries

Inactive Publication Date: 2014-03-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these involve nanosized SnO 2 The methods of compounding materials and carbon nanotubes are mostly solution methods, and the obtained negative electrode materials are not prepared in situ on the current collector.
This adversely affects the effective contact between the active material and the current collector and the effective utilization of the active material, and also makes the manufacturing process of the entire button battery more complicated.

Method used

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  • CNT (Carbon Nano Tube)/SnO2 coaxial composite array lithium ion battery negative electrode material
  • CNT (Carbon Nano Tube)/SnO2 coaxial composite array lithium ion battery negative electrode material
  • CNT (Carbon Nano Tube)/SnO2 coaxial composite array lithium ion battery negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Using tantalum foil with a thickness of 30 μm and a purity of 99.90% as the substrate, the ultra-high vacuum electron beam evaporation system (model: UMS500P) was used at 4.0×10 -8 Under the pressure of mbar, 11nm thick alumina and 0.8nm thick iron were sequentially deposited at room temperature at the rate of 0.02nm / s and 0.05nm / s to obtain a three-layer structure of iron catalyst layer / alumina buffer layer / metal tantalum foil.

[0026] The obtained three-layer structure was placed in the central heating zone of a thermal CVD furnace (model: OTF-1200X), and the temperature was raised to 650 °C under the protection of argon, then the argon was turned off, hydrogen was introduced and pretreated for 20 minutes. Feed the mixed gas of acetylene, hydrogen and argon with the flow rate of 8sccm, 60sccm and 140sccm respectively again until the pressure in the furnace rises to 1.2×10 4 Pa, keep warm for 30 minutes and then cool down to obtain carbon nanotube arrays grown in situ...

Embodiment 2

[0037] Preparation of carbon nanotubes / SnO according to the process shown in Example 1 2 Coaxial composite array lithium-ion battery anode material, the difference is only in the atomic layer deposition of SnO 2 The temperature is 400°C.

[0038] The test results show that the first discharge specific capacity of the prepared negative electrode material is 1168.2mAh / g, the first charge specific capacity is 693.3mAh / g, and the highest reversible discharge specific capacity and the highest reversible charge specific capacity are 735.1mAh / g and 669.7mAh respectively. / g, and its Coulombic efficiency has remained at a high level of around 95%.

Embodiment 3

[0040] Preparation of carbon nanotubes / SnO according to the process shown in Example 1 2 Coaxial composite array lithium-ion battery anode material, the difference is only in the atomic layer deposition of SnO 2 The temperature is 200°C.

[0041] The test results show that the first discharge specific capacity of the prepared negative electrode material is 1521.9mAh / g, the first charge specific capacity is 716.7mAh / g, and the highest reversible discharge specific capacity and the highest reversible charge specific capacity are 752.8mAh / g and 680.1mAh respectively. / g, its Coulombic efficiency has been maintained at a high level of around 91%.

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Abstract

The invention discloses a preparation method of a CNT (Carbon Nano Tube) / SnO2 coaxial composite array lithium ion battery negative electrode material. The method comprises the following steps: firstly pre-depositing an aluminium oxide buffer layer and an iron catalyst layer on a tinsel current collector by utilizing an electron beam evaporation method, growing a CNT array in situ on the current collector by utilizing a hot CVD (Chemical Vapor Deposition) method, and then depositing an atomic layer on the generated CNT array, so as to obtain the CNT / SnO2 coaxial composite array. Microlitic SnO2 nano tubes are uniformly coated at the outside surface of CNTs, and are firmly combined with the CNTs, and the CNT / SnO2 coaxial material is directly and firmly combined with a metal base. The CNT / SnO2 coaxial composite array lithium ion battery negative electrode material provided by the invention shows excellent electrical property.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a carbon nanotube / SnO 2 In situ preparation method of anode material for coaxial composite array lithium ion battery. Background technique [0002] With the advancement of science and technology, people's demand for high-performance lithium-ion batteries is increasing day by day, and the theoretical capacity of 372mAh / g of graphite anode materials in commercial lithium-ion batteries limits the improvement of lithium-ion battery performance. SnO 2 As an anode material, it has a theoretical specific capacity of 781mAh / g, which provides the possibility for it to replace traditional graphite anode materials. However, SnO 2 As a negative electrode material, the volume changes greatly during the discharge and charging process (the process of intercalating and deintercalating lithium ions), which causes the active material to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/131H01M4/133H01M4/62
CPCY02E60/122H01M4/36H01M4/625H01M10/0525Y02E60/10
Inventor 董绍明冷越阚艳梅甄琦胡建宝张翔宇
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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