Amphicharge-Storable Pyropolymers Containing Multitiered Nanopores

作者：Kim Na Rae; Lee Sang Moon; Kim Min Wook; Yoon Hyeon Ji; Hong Won G; Kim Hae Jin; Choi Hyoung Jin; Jin Hyoung Joon; Yun Young Soo

来源：Advanced Energy Materials, 2017, 7(19): 1700629.

DOI：10.1002/aenm.201700629

<jats:title>Abstract</jats:title><jats:p>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<jats:sup>+</jats:sup>/Li, HN‐PPs store amphicharges by a pseudocapacitive manner of Li‐ion (mainly &lt;3.0 V) and electrochemical double layer formation of anion (primarily &gt;3.0 V). Through these surface‐driven charge storage behaviors, HN‐PPs achieve a significantly high specific capacity of ≈460 mA h g<jats:sup>−1</jats:sup> at 0.5 A g<jats:sup>−1</jats:sup>, maintaining specific capacities of 140 mA h g<jats:sup>−1</jats:sup> at a high specific current of 30 A g<jats:sup>−1</jats:sup> and 305 mA h g<jats:sup>−1</jats:sup> after 2000 cycles at 3 A g<jats:sup>−1</jats:sup>. Furthermore, asymmetric energy storage devices based on HN‐PPs deliver a high specific energy of 265 W h kg<jats:sup>−1</jats:sup> and high specific power of 5081 W kg<jats:sup>−1</jats:sup> with long‐term cycling performance.</jats:p>

• 出版日期2017-10-11