Search

Uniform Co 9 S 8 nanosheet arrays on conductive nickel foam (Ni-Co 9 S 8 ) are successfully fabricated through a facile hydrothermal method and directly used as the electrode for high-performance lithium-ion batteries. The phase structure and morphology are characterized systematically. Galvanostatic charge-discharge measurement is applied to investigate the electrochemical performance of the Ni-Co 9 S 8 electrode. The Ni-Co 9 S 8 electrode exhibits good lithium-storage cycle performance (720 mAh g −1 at 100 mA g −1 after 100 cycles, 330 mAh g −1 after 50 cycles at 2000 mA g −1 ). [ABSTRACT FROM AUTHOR]

Hierarchical SnO2/Fe2O3 hollow spheres are fabricated through the solvothermal method accompanied by a facile solution procedure in the absence of any surfactant. The composition, crystalline structure, morphology, and electrochemical properties of the synthesized product are investigated systematically. The SnO2/Fe2O3 as an anode material in Li-ion batteries demonstrates a better reversible capacity and very good rate capability and cyclic performance compared with pure-phase SnO2 hollow spheres. The greatly enhanced Li-ion storage capability of the SnO2/Fe2O3 hollow spheres is believed to result from the synergy of the two materials, SnO2 and Fe2O3, which provides breathable aggregates for effective buffering of the drastic volume changes during the charge/discharge process. This work reports a promising method for the design and preparation of nanocomposite electrodes for Li-ion batteries. [ABSTRACT FROM AUTHOR]

ZnFe 2 O 4 /C composites have been prepared through a molten salt route combined with a carbonization process using glucose as carbon source. The field emission scanning electron microscopy and transmission electron microscopy confirm that the as-prepared ZnFe 2 O 4 /C is composed of nanodiscs with the thickness of 100–200 nm. The electrochemical measurement depicts that the ZnFe 2 O 4 /C electrode exhibits good cycle ability and rate capacity. A specific capacity of 965 mAh g −1 can be maintained after 100 cycles at the current density of 100 mA g – 1 . When the current density is increased to 2000 mA g −1 , the specific capacity still remains at 595 mAh g −1 after 50 cycles. [ABSTRACT FROM AUTHOR]