Electrochemical Properties of Zn-Al-La Layered Double Hydroxides in Zn-Ni Secondary Batteries

Zn-Al-La layered double hydroxides (LDHs) were prepared by the hydrothermal method and used as a new anodic material for Zn-Ni secondary batteries. The morphology and microstructure of Zn-Al-La-LDHs were analyzed by Fourier transform infrared, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The electrochemical properties of Zn-Al-La-LDHs as negative electrode materials for Zn-Ni batteries were studied by the cyclic voltammetry, Tafel polarization curve, and constant current charge-discharge test. XRD and SEM analysis showed that the crystallinity of the prepared Zn-Al-La-LDHs was good and the dispersion was uniform and showed regular hexagonal structures. The results of electrical properties show that Zn-Al-La-LDHs have good cycle reversibility and corrosion resistance when applied to Zn-Ni secondary batteries. The analysis of galvanostatic charge-discharge measurement results shows that the Zn-Al-La-LDH electrode has excellent cycle stability and charge-discharge characteristics. After 150 cycles, the cycle retention rate can reach 91.63%.