Zn-Al layered double hydroxide growing on the substrate of graphene and polypyrrole composite as anode material for Zn-Ni secondary battery

In this work, the zinc-aluminum layered double hydroxide grown on the substrate of graphene and polypyrrole composite (Zn-Al LDHs/GP) was prepared by in-situ growth method, and evaluated as anode materials of Zn-Ni secondary batteries. The results indicate that the Zn-Al LDHs/GP electrode has the smallest peak potential difference (0.452 V), the lowest charge transfer resistance and the superior cycling performance. Compared to the normal Zn-Al LDHs, charge transfer resistance of Zn-Al LDHs/GP electrode is reduced by 6.65 Omega. Moreover, the specific capacity of the Zn-Al LDHs/GP electrode is still remained at 350.0 mAh g(-1) after 1000 cycles, with a retention rate of 91.5% and it exhibits better rate capability. (C) 2019 Elsevier B.V. All rights reserved.