Abstract

Sn 6O 4(OH) 4-coated ZnO was successfully prepared by homogeneous precipitation technique based on the hydrolyzation of SnCl 2. Transmission electron microscopy (TEM) micrograph and X-ray diffraction (XRD) pattern revealed that Sn 6O 4(OH) 4 was coated on the surface of ZnO particle. Energy dispersive X-ray spectrum (EDS) of Sn 6O 4(OH) 4-coated ZnO showed that the content of coating was about 7 wt%. The electrochemical performance of Sn 6O 4(OH) 4-coated ZnO was investigated by charge/discharge method and slow rate cyclic voltammogram. Compared with pure ZnO and ZnO intermingled with SnO 2, Sn 6O 4(OH) 4-coated ZnO showed the largest discharge capacity (557 mAh g −1), the most stable midpoint discharge voltage, the lowest fading rate and charge plateau voltage. XRD pattern of discharged Zn electrode showed that the coating changed irreversibly into Sn and always existed as the form of Sn.

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