High-performance Lithium Secondary Batteries Using Cathode Active Materials of Triquinoxalinylenes Exhibiting Six Electron Migration

摘要

A coin cell battery is fabricated using triquinoxalinylene as a cathode active material and a lithium metal anode. The first discharge curve shows a remarkably large capacity (420 Ahkg~(-1)), which corresponds to a six electron migration in the first charge. However, repeating the charge-discharge until the 15th cycle gradually decreases the capacity, but after that the capacity remains constant with a value of 220 Ah kg~(-1). This large value remains even after 100 cycles. Additionally, the use of a tribromo-substituted derivative gives a large discharge capacity (≈250 Ahkg~(-1)) due to a comparatively stable six electron migration from the first charge-discharge cycle.