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Start Over Author "Jiao Zheng" Journal electrochimica acta
10 results on '"Jiao Zheng"'

9. Synthesis of three-dimensional hollow SnO 2 @PPy nanotube arrays via template-assisted method and chemical vapor-phase polymerization as high performance anodes for lithium-ion batteries

Author

Xinhua Xu, Hongyan Yang, Chao Wang, Jiao Zheng, Zhenzhen Cao, and Peng Dou

Subjects
Conductive polymer, Nanotube, Nanostructure, Materials science, General Chemical Engineering, Nanotechnology, 02 engineering and technology, Electrolyte, 010402 general chemistry, 021001 nanoscience & nanotechnology, Polypyrrole, 01 natural sciences, 0104 chemical sciences, Anode, chemistry.chemical_compound, chemistry, Polymerization, Electrode, Electrochemistry, 0210 nano-technology
Abstract

A novel polypyrrole (PPy) coated three-dimensional (3D) SnO2 nanotube arrays (SnO2@PPy) is synthesized via a template-assisted method followed by a chemical vapor-phase polymerization process as a high performance anode for lithium-ion batteries. In this new type electrode material, the hollow interiors of SnO2 are able to provide enough spaces for the accommodation of large volume expansion during the insertion of lithium-ion, making for the improvement of the stability of electrode. Meanwhile, the addition of conductive PPy layer could facilitate the electron transport, prevent the aggregation of active materials and warrant the stability of as-formed solid electrolyte interface (SEI) films. As a result, the integration of 3D hybrid nanostructure electrode is capable of retaining a high capacity of 646 mA h g−1 after 150 cycles with a coulomb efficiency above 98% and a capacity retention of 221 mA h g−1 even at a high current density of 5000 mA g−1, revealing better cycling and rate properties compared with bare SnO2 nanotube arrays anode. This nanoengineering strategy can provide a facile and controllable way to synthesize other anode materials for lithium-ion batteries.

Published
2016

10. Graphene modified Li3V2(PO4)3 as a high-performance cathode material for lithium ion batteries

Author

Jiang, Yong, Xu, Weiwen, Chen, Dandan, Jiao, Zheng, Zhang, Haijiao, Ma, Qiliang, Cai, Xinhui, Zhao, Bing, and Chu, Yuliang

Subjects
*LITHIUM-ion batteries, *GRAPHENE, *CATHODES, *LITHIUM compounds, *NANOPARTICLES, *ELECTRIC discharges
Abstract

Abstract: In this paper, graphene-modified Li3V2(PO4)3 composites have been developed as Li-ion battery cathode materials with high specific capacity and excellent cycling stability. The composites are prepared by spray–drying process using graphene oxide nanosheet and citric acid as carbon source. X-ray diffraction patterns demonstrate that the as-prepared samples are well crystallized with orderly monoclinic structures. SEM and TEM images reveal that the 3D network graphene and Li3V2(PO4)3 primary nanoparticles interlace with each other. The citric acid-derived amorphous carbon species interrupt the stacking of graphene sheets and minimize in-plane anisotropy of electronic migration within graphene layers, which would facilitate fast electron migration and Li+ diffusion throughout the micro-sized spherical secondary particles. The discharge capacity of the composite could respectively achieve 131.4 and 181.5mAhg−1 in the voltage range 3.0–4.3V and 3.0–4.8V at 0.1C discharge rate, which almost reach the theoretical capacity of the cathode material. Both of them nearly showed no capacity decay at 0.1C charging and discharging rate after long cycles. [Copyright &y& Elsevier]

Published
2012
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