Green molten salt synthesis and Li-ion storage performance of sodium dimolybdate

A facile and fast molten salt strategy is developed, for the first time, to synthesis sodium dimolybdate (Na 2 Mo 2 O 7 ). The process is based on a thermodynamically favorable reaction between naturally available precursors MoS 2 and NaCl to produce Na 2 Mo 2 O 7 as well as a gas phase that leaves the system. The product is characterized by electron microscopy and energy-dispersive X-ray spectroscopy (EDX) as well as X-ray diffraction (XRD) and Raman spectroscopy . The prepared Na 2 Mo 2 O 7 in combination with molten salt-synthesized graphene nanosheets is examined as anode material for Li-ion batteries, exhibiting an interesting performance, with the first cycle discharge and charge capacities of 1363 and 857 mAh g −1 , respectively, at 100 mA g −1 . A reversible Li storage capacity of 506 mAh g −1 can still be observed after 100 cycles. The results are rather interesting towards the development of low-cost and high-performance Na 2 Mo 2 O 7 anode materials.