Graphene-based materials have superior electric conductivity, high surface areas, chemical stability, and a broad electrochemical window which are advantageous in the application of energy storages.  A Co(OH)2 graphene nanosheets (Co(OH)2-GNS) composite as a high performance anode material was firstly prepared through a simultaneous hydrothermal method.  The specific discharge and charge capacities of Co(OH)2-GNS attain to 1599 and 1120 mAh/g at a current density of 200 mA/g in the first cycle, respectively.  We also make use of commercialized Si powder and a simple spray drying method to prepare a novel bath lily-like graphene sheetwrapped nano-Si (GS-Si) composite anode material for lithium ion batteries, The composite based on a commercial Si product exhibits a high reversible capacity of 1525 mAh/g and superior cycling stability. Spray drying is also inferential to be a suitable synthetic method for preparing 3D graphene-based composites. The 3D crumbled grapheme sheet-wrapped nano-Fe2O3 (Fe2O3@GS) composites have been prepared by a simple spray drying process and a following mild thermal reduction in air. It can be seen, the crumpled GS encapsulation not only constitutes 3D continuous and highly conductive network but also provides elastic void spaces to accommodate the strain and stress of the volume change of Fe2O3 and avoid the aggregation and pulverization of nano-Fe2O3 particles during cycling.A novel, flexible and binder-free graphene/Na2/3[Ni1/3Mn2/3]O2 composite electrode (GNNM) is fabricated via two simple ultrasonic dispersion and vacuum filtration. Graphene sheets cover Na2/3[Ni1/3Mn2/3]O2 particles very well and establish stably electric conductive structures duo to their strong p-p bonds. GNNM electrode as cathode for SIBs presents excellent electrochemical performances. During 2.0V to 4.0V, GNNM electrode delivers reversible specific capacity of 83 mAh/g stably at 1C rate and is close to the theoretical capacity of Na2/3[Ni1/3Mn2/3]O2.  In this talk, we will present the results mentioned above and prospect the graphene-based electrode material application in the design of electrochemical energy storage device.The authors are grateful for the financial support of this work by the Natural Science Foundation of China (21336003) and the 973 Program of China (2014CB239700).

Graphene-based electrode material design and preparation process for rechargeable battery application

248th National Meeting (2014)

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