Jump to main content
Jump to site search


Carboxylated polyimide separator with excellent lithium ion transport properties for high-power densities lithium-ion battery

Abstract

The improvement of lithium ion transport properties, along with ever-increasing demand for high-power density, is a key to boosting the development of lithium-ion batteries. Here, we present a new class of carboxylated polyimide (PI) separator, which can be fabricated via an alkali treatment-based surface modification. The -COOH groups with unshared electron pairs were supposed to contribute to the desolvation of lithium ions and the increasement in the lithium ion transport rate. Notably, the modification did not destroy the microstructure of the PI separator, and thus the effect of -COOH group on the lithium ion transport properties was clearly demonstrated in this work. The result showed that the carboxylated PI separator was conducive to improving the lithium ion transference number (up to 0.87), which was four times higher than that for the original PI separator. More importantly, for the first time, the –COOH group was calculated to increase the lithium ion transport rate by more than six times. Benefiting from its high lithium ion transference number and slightly increased ionic conductivity, the cell assembled with the carboxylated PI separator achieved better cycle performance and higher rate capability than that with the original PI separator.

Back to tab navigation

Supplementary files

Publication details

The article was received on 02 Oct 2017, accepted on 05 Dec 2017 and first published on 05 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA08702K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    Carboxylated polyimide separator with excellent lithium ion transport properties for high-power densities lithium-ion battery

    C. Lin, H. Zhang, Y. Song, Y. Zhang, J. Yuan and B. Zhu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08702K

Search articles by author

Spotlight

Advertisements