Synthesis of Graphene Supported MOx/C Nanocomposite as an Anode Material for Lithium ion Nattery

• Main Authors: Tse-Ming Chiu, 邱則明
• Other Authors: Bing-Joe Hwang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/yypguc

碩士 === 國立臺灣科技大學 === 化學工程系 === 100 === In this work Graphene @ MOx/C (M=Sn、Mn) composite was synthesized through a top-down strategy. In the synthesis procedure, micro-sized metal powder, glucose and 1wt% graphene oxide suspension was directly employed as the precursor. Under hydrothermal reaction conditions, micro-sized metal powders were broken down in to nano-sized, highly dispersed particles. The participation of graphene in this composite increase the electronic conductivity of carbonaceous polysaccharide based hybrid materials and is proven to be beneficial to the capacity retention and also the diffusion resistance. More than 427 mAh/g of reversible capacity is achieved with Graphene @ SnO2/C composite-based half cell at a current density of 200mA/g up to the 200th cycle. A manganese-based graphene @ MnCO3/C synthesized following the same procedure was also performed. In this case, micro-sized manganese metal was transformed into 8-10 nm sized Manganese carbonate. After 400oC heat treatment, a new kind of electrochemically active compound grapheme @ Mn3O4/C was formed. Cycling under the current density of 200 mA/g a capacity of 438mAh/g was reached up to the 30th cycle.