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Single nanowire electrochemical device and assembly and in-situ characterization method thereof

A rice wire and nanowire technology, applied in the field of in-situ characterization, single nanowire electrochemical devices and their assembly

Active Publication Date: 2010-12-22
武汉楚理佳纳新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The in-situ characterization technology for lithium-ion batteries mainly involves nuclear magnetic resonance spectroscopy (NMR), but the in-situ characterization of the electrical transport properties of materials has not been reported.

Method used

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  • Single nanowire electrochemical device and assembly and in-situ characterization method thereof
  • Single nanowire electrochemical device and assembly and in-situ characterization method thereof
  • Single nanowire electrochemical device and assembly and in-situ characterization method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The technical solution for the assembly of a single nanowire electrochemical device includes the following steps, which are carried out in sequence:

[0026] 1) V prepared by hydrothermal method 3 o 7 ·H 2 O nanowire positive electrode and highly ordered pyrolytic graphite flake film negative electrode are dispersed on the surface with a layer of 60 nm thick SiO 2 on the silicon substrate; where, V 3 o 7 ·H 2 The preparation method of O nanowires can refer to the following documents: H, Qiao, et al.Electrochem.Commun.8, 21-26 (2006); Y.Oka, et al.J.Solid State Chem.89, 372-377 ( 1990); high-order pyrolytic graphite flake film is prepared by tearing tape method, can refer to the following literature K.S.Novoselov, et al.Science, 306, 666-669 (2004);

[0027] 2) making Cr (5nm) and Au (80nm) metal electrodes as current collectors at the two ends of the nanowire and the nanofilm respectively by electron beam lithography;

[0028] 3) Using PECVD technology to deposit...

Embodiment 2

[0034] The technical scheme adopted for the assembly of a single nanowire electrochemical device includes the following steps, which are carried out in sequence:

[0035] 1) The coaxial Si / a-Si nanowire anode and LiCoO 2 The thin-film positive electrode is dispersed and deposited on the surface with a layer of 60nm thick SiO 2 on a silicon substrate; wherein, coaxial Si / a-Si nanowires are prepared by chemical vapor deposition, and the preparation method refers to the following literature: L.F.Cui, et al.Nano Lett., 9, 491-495(2009); LiCoO 2 The film was prepared by magnetron sputtering, and the film deposition conditions were: deposition for 10 minutes, annealing at 500°C for 2.5 hours;

[0036] 2) Electron beam lithography is used to fabricate Cr (5nm) and Au (80nm) metal electrodes at both ends of the nanowire and the nanofilm as current collectors;

[0037] 3) Using PECVD technology to deposit 500nm thick silicon nitride on the metal current collector as a protective laye...

Embodiment 3

[0043] The technical scheme adopted for the assembly of a single nanowire electrochemical device includes the following steps, which are carried out in sequence:

[0044] 1) β-AgVO 3 The positive electrode of nanowires and the negative electrode of highly ordered pyrolytic graphite flake film are dispersed on the substrate of polydimethylsiloxane (PDMS) insulation; among them, β-AgVO 3 The nanowires are prepared by a hydrothermal method, and reference can be made to the following literature: L.Q.Mai, et al.Nano Lett., 10, 2604-2608 (2010); the preparation method of the high-order pyrolytic graphite sheet is the same as that of Example 1;

[0045] 2) Ti (5nm) and Al (80nm) metal electrodes are fabricated as current collectors at both ends of the nanowire and the nanofilm by electron beam lithography;

[0046] 3) Prepare a 500nm thick SU8 photoresist on the metal current collector by photolithography technology as the protective layer of the current collector;

[0047] 4) LiBF...

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Abstract

The invention relates to a single nanowire electrochemical device and an assembly and in-situ characterization method thereof. The method comprises the following steps of: dispersing nanowire anodes of vanadium oxide nanowires, and the like, nano film cathodes of HOPG (Highly Oriented Pyrolytic Graphite), and the like or nanowire cathodes of silicon nanowires, and the like and nano film anodes of LiCoO2, and the like on a substrate; respectively making metal electrodes at both ends of the nanowires and the nano films as current collectors by adopting technologies, such as PECVD (Plasma-Enhanced Chemical Vapor Deposition), and the like; then, depositing silicon nitride or spinning a photoresist on the metal current collectors as protection layers of the current collectors by adopting the PECVD technology, and the like; and finally, dispensing a polymer electrolyte on the surface of the substrate to finish the assembly of the single nanowire electrochemical device. In the invention, charging and discharging tests are carried out on the electrochemical device, then in-situ electrical transport performance tests, micro-domain Raman spectrum analysis, and the like are carried out on the single nanowire electrodes in different charging and discharging states, the direct relation among the electrical transport, the structure and the electrochemical performance of the nanowire electrode material is established, a platform is provided for battery diagnosis, and the like and a support power supply can be provided for the nano device.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a single nanowire electrochemical device and methods for its assembly and in-situ characterization. Background technique [0002] The specific capacity of the positive and negative materials of the lithium-ion battery determines the specific capacity of the entire battery. Bulk or micron-scale electrode materials have obvious capacity fading during battery charge and discharge cycles, but nanowire electrode materials have attracted attention in the fields of lithium-ion batteries and electrochemical devices due to their special anisotropy and favorable electron transport. Therefore, it is of great significance to study the nature of capacity fading and modification of nanowire battery materials for the development of high-performance lithium-ion batteries and electrochemical devices. [0003] At present, the electrodes of nanowire lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/131H01M4/133H01M10/42
CPCY02E60/122Y02E60/10
Inventor 麦立强董亚杰徐林韩春华
Owner 武汉楚理佳纳新能源科技有限公司
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