Enhanced cycling stability of spinel LiMn2O4 cathode by incorporating graphene sheets

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• 作者：Qisheng Ge (1)
  Dongfang Wang (1)
  Fulin Li (2)
  Da Chen (1)
  Guangxing Ping (1)
  Meiqiang Fan (1)
  Laishun Qin (1)
  Liqun Bai (3)
  Guanglei Tian (1)
  Chunju Lv (1)
  Kangying Shu (1)
  
  1. School of Materials Science and Engineering ; China Jiliang University ; Hangzhou ; Zhejiang province ; 310018 ; China
  2. Zhejiang Tianneng Energy Technology Co. ; Ltd. ; Zhicheng Industry Zone ; Changxing County ; Zhejiang Province ; 313100 ; China
  3. School of Sciences ; Zhejiang Agriculture and Forestry University ; Hangzhou ; Zhejiang Province ; 311300 ; China
  
• 关键词：spinel LiMn2O4 ; graphene ; nanocomposites ; cathode materials ; cycling stability
• 刊名：Russian Journal of Electrochemistry
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：51
• 期：2
• 页码：125-133
• 全文大小：2,991 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Physical Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3342

文摘

LiMn2O4-graphene nanocomposites with different weight ratios of LiMn2O4/graphene were successfully prepared via a simple method by ball-milling of commercially available LiMn2O4 particles and graphene nanosheets. Experimental results revealed that the spinel LiMn2O4 particles within the as-prepared LiMn2O4-graphene nanocomposites were well distributed onto the flexible graphene sheets, and the nano-composites with a higher graphene content were favorable to form more uniform composite materials. Compared to the pristine spinel LiMn2O4 particles, the as-prepared LiMn2O4-graphene nanocomposites exhibited lower initial discharge capacities owing to the reduced amount of active materials (LiMn2O4 particles) in the nanocomposites. However, their electrochemical cycling performance was significantly enhanced, high-lighting the advantages of anchoring LiMn2O4 particles on graphene sheets. The enhanced cycling performance could be ascribed to the fact that the graphene nanosheets within the LiMn2O4-graphene nanocomposites could provide a 3D conducting scaffold, which could not only alleviate the aggregation of LiMn2O4 particles and accommodate the volume changes of LiMn2O4 particles, but also enhance the ionic conductivity and charge transfer during the lithiation/delifhiation process.