Negatively charged nanoporous membrane for a dendrite-free alkaline zinc-based flow battery with long cycle life.

ABSTRACT: Alkaline zinc-based flow batteries are regarded to be among the best choices for electric energy storage. Nevertheless, application is challenged by the issue of zinc dendrite/accumulation. Here, we report a negatively charged nanoporous membrane for a dendrite-free alkaline zinc-based flow battery with long cycle life. Free of zinc dendrite/accumulation, stable performance is afforded for ?240 cycles at current densities ranging from 80 to 160?mA?cm^-2 using the negatively charged nanoporous membrane. Furthermore, 8?h and 7?h plating/stripping processes at 40?mA?cm^-2 yield an average energy efficiency of 91.92% and an areal discharge capacity above 130?mAh?cm^-2. A peak power density of 1056?mW?cm^-2 is achieved at 1040?mA?cm^-2. This study may provide an effective way to address the issue of zinc dendrite/accumulation for zinc-based batteries and accelerate the advancement of these batteries.

SUBMITTER: Yuan Z 

PROVIDER: S-EPMC6137156 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature