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作者:

Zhao, Yujuan (Zhao, Yujuan.) | Xia, Minghua (Xia, Minghua.) | Hu, Xinsa (Hu, Xinsa.) | Zhao, Zongkui (Zhao, Zongkui.) | Wang, Yang (Wang, Yang.) | Lv, Zhi (Lv, Zhi.)

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摘要:

Micron spherical Sn doping Li1.2Ni0.2Mn0.8O2 cathode materials are synthesized via a carbonate co-precipitation method. The crystal structure and morphology of the pristine and Sn-doping samples are characterized by a joint X-ray diffraction (XRD) Rietveld refinement method and scanning electron microscopy (SEM). It is proved that Sn successfully doped into the aimed materials. X-ray photoelectron spectroscopy (XPS) results demonstrate that the chemical state of Sn is +4. Appropriate doping contents of Sn are beneficial to improve the electrochemical performance, including the capacities and cycling stability. The sample with 1.0 mol% Sn delivers high initial discharge capacities and improved rate performance (212.6 mAh/g at 0.2C and 137.8 mAh/g at 5C, respectively). The capacity retention is 96.2% after 50 cycles at 0.2C. It is very stable for the doped sample with 2.0 mol% Sn after 160 cycles at 0.2C, the capacity retention is 98.5%. The discharge capacity decreases markedly with the Sn contents increase to 3.0 mol%, since Sn4+ can not participate in electrochemical reaction. Electrochemical impedance spectroscopy (EIS) results demonstrate that the charge transfer resistance of the samples with 1.0-2.0 mol% Sn-doping decreases obviously. It reveals that doping with appropriate Sn substitution not only improves the structure stability, but also increases the conductivity, therefore improves their rate capability and cycling stability. (C) 2015 Elsevier Ltd. All rights reserved.

关键词:

carbonate co-precipitation method Li-ion battery Li-rich cathode materials Sn doping

作者机构:

  • [ 1 ] [Zhao, Yujuan]Beijing Univ Technol, Coll Environm & Energy Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Xia, Minghua]Beijing Univ Technol, Coll Environm & Energy Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Hu, Xinsa]Beijing Univ Technol, Coll Environm & Energy Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Zhao, Zongkui]Beijing Univ Technol, Coll Environm & Energy Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Wang, Yang]Beijing Univ Technol, Coll Environm & Energy Engn, Beijing 100124, Peoples R China
  • [ 6 ] [Lv, Zhi]Beijing Univ Technol, Coll Environm & Energy Engn, Beijing 100124, Peoples R China
  • [ 7 ] [Zhao, Yujuan]Beijing Univ Technol, Guyue New Mat Res Inst, Beijing 100124, Peoples R China

通讯作者信息:

  • [Zhao, Yujuan]Beijing Univ Technol, Coll Environm & Energy Engn, Beijing 100124, Peoples R China

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来源 :

ELECTROCHIMICA ACTA

ISSN: 0013-4686

年份: 2015

卷: 174

页码: 1167-1174

6 . 6 0 0

JCR@2022

ESI学科: CHEMISTRY;

ESI高被引阀值:179

JCR分区:1

中科院分区:2

被引次数:

WoS核心集被引频次: 61

SCOPUS被引频次: 65

ESI高被引论文在榜: 0 展开所有

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