tailieunhanh - Synthesis and electrochemical performance of MoO2/graphene nanomaterials as anode for lithium-ion battery

In this articles, molybdenum dioxide/graphene composites were successfully prepared by a hydrothermal method. The results indicated graphene composition affects the properties of the electrochemical electrode, increased to 10 wt%, the molybdenum dioxide particles were uniformly deposited on the graphene sheets. The samples used as the electrode material for lithium batteries; it exhibited high reversible specific capacities of 1267 mAhg-1 at the second cycle and 629 mAhg-1 after 60 cycles. | Vietnam Journal of Chemistry, International Edition, 55(4): 424-428, 2017 DOI: Synthesis and electrochemical performance of MoO2/graphene nanomaterials as anode for lithium-ion battery Nguyen Van Tu1,2*, Yang Xue1 1 School of Material Science and Engineering, Wuhan University of Technology, Wuhan, P. R. China 2 Institute for Chemistry and Materials, Viet Nam Received 16 January 2017; Accepted 28 August 2017 Abstract In this articles, molybdenum dioxide/graphene composites were successfully prepared by a hydrothermal method. The results indicated graphene composition affects the properties of the electrochemical electrode, increased to 10 wt%, the molybdenum dioxide particles were uniformly deposited on the graphene sheets. The samples used as the electrode material for lithium batteries; it exhibited high reversible specific capacities of 1267 mAhg-1 at the second cycle and 629 mAhg-1 after 60 cycles. The outstanding electrochemical performance of the composite can be attributed to the synergistic interaction between molybdenum dioxide and graphene. There were enough void spaces to buffer volume change in the structure. Furthermore, graphene nanosheets in the hybrid material could act as not only lithium storage electrodes but also electronic conductive channels to improve the electrochemical performances. Keywords. Molybdenum dioxide, graphene composites, lithium-ion batteries. 1. INTRODUCTION Rechargeable lithium ion batteries (LIBs) have become one of the most promising types of battery technology for electrochemical energy storage due to their high energy density, low maintenance, and relatively low self-discharge [1, 2]. However, in the classical commercial LIBs, graphitic carbon was the most popular electrode material, which only delivers a theoretical specific capacity of 372 mAhg-1 [3]. Developing new electrode materials with high energy densities has been an important way to satisfy the ever-growing demand for .