3 years ago

Amphicharge-Storable Pyropolymers Containing Multitiered Nanopores

Amphicharge-Storable Pyropolymers Containing Multitiered Nanopores
Young Soo Yun, Hyoung-Joon Jin, Hae Jin Kim, Hyeon Ji Yoon, Min Wook Kim, Won G. Hong, Na Rae Kim, Sang Moon Lee, Hyoung Jin Choi
In this study, hierarchically nanoporous pyropolymers (HN-PPs) including numerous redox-active heteroatoms are fabricated from polyaniline nanotubes by heating with KOH. In the large operating voltage range 1.0–4.8 V versus Li+/Li, HN-PPs store amphicharges by a pseudocapacitive manner of Li-ion (mainly <3.0 V) and electrochemical double layer formation of anion (primarily >3.0 V). Through these surface-driven charge storage behaviors, HN-PPs achieve a significantly high specific capacity of ≈460 mA h g−1 at 0.5 A g−1, maintaining specific capacities of 140 mA h g−1 at a high specific current of 30 A g−1 and 305 mA h g−1 after 2000 cycles at 3 A g−1. Furthermore, asymmetric energy storage devices based on HN-PPs deliver a high specific energy of 265 W h kg−1 and high specific power of 5081 W kg−1 with long-term cycling performance. Hierarchically nanoporous pyropolymers (HN-PPs) including numerous oxygen and nitrogen heteroatoms are fabricated from polyaniline nanotubes by heating with KOH. HN-PPs exhibit a remarkably high specific capacity of ≈460 mA h g−1, high rate capabilities by ≈30 A g−1, and long-lasting cycling performance, the result of storing amphicharges (Li-ion and anion) through both Faradaic reactions and electrochemical double layer formation.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700629

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