Rapid formation of polyimide nanofiber membranes via hot-press treatment and their performance as Li-ion battery separators.

ABSTRACT: We describe a new strategy to prepare thermally- and electrochemically-stable polyimide (PI) nanofiber membranes by the hot-press treatment of polyamic acid (PAA) nanofiber sheets in situ and examine their performance as Li-ion battery separators. Typical thermal imidization of PAA to PI membranes using sequential high temperature treatments in an oven takes a long time, but our method readily completes this conversion process at a mild temperature in 30 min while generating a high probability of inter-nanofiber imidization. Along with the improved electrolyte uptake capability and uniform distribution of the pore size and porosity caused by the dense and compact arrangements, the hot-press-induced PI membrane exhibits relatively thin sheets and a much greater mechanical strength th

SUBMITTER: Hou J 

PROVIDER: S-EPMC9079989 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature