Unusual Capacity Increases with Cycling for Ladder-Type Microporous Polymers

Tyler B Schon; So Young An; Andrew J Tilley; Dwight S Seferos

doi:10.1021/acsami.8b18293

Unusual Capacity Increases with Cycling for Ladder-Type Microporous Polymers

ACS Appl Mater Interfaces. 2019 Jan 16;11(2):1739-1747. doi: 10.1021/acsami.8b18293. Epub 2019 Jan 7.

Authors

Tyler B Schon^{1

2}, So Young An^{1

2}, Andrew J Tilley^{1

2}, Dwight S Seferos^{1

2}

Affiliations

¹ Department of Chemistry , University of Toronto , 80 St. George Street , Toronto , Ontario M5S 2H6 , Canada.
² Department of Chemical Engineering and Applied Chemistry , University of Toronto , 200 College Street , Toronto , Ontario M5S 3E5 , Canada.

PMID: 30614678
DOI: 10.1021/acsami.8b18293

Abstract

Microporous polymers using triptycene vertices and various ladder-type benzimidazole linkers are synthesized and tested as lithium-ion battery anodes. An unusual increase in performance is observed upon cycling, affording high capacities of 783 and 737 mAh g^-1 for a perylene derivative and the pyromellitic derivative after 1000 cycles. The high performance of these materials after cycling is attributed to favorable electrode morphology and high crystallinity for perylene derivative, and the presence of charge carriers for pyromellitic derivative. By studying the effect of various linkers on the electrochemical performance, structure-property relationships are proposed that can be used to guide the development of high-performance materials for lithium-ion batteries.

Keywords: anodes; ladder-type polymer; lithium ion batteries; microporous polymers; organic electrode materials; superlithiation.