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Achieving Fast and Stable Lithium/Potassium Storage by In Situ Decorating FeSe2 Nanodots into Three-Dimensional Hierarchical Porous Carbon Networks
journal contribution
posted on 2020-05-22, 21:43 authored by Wang Zhao, Qiwei Tan, Kun Han, Donglin He, Ping Li, Mingli Qin, Xuanhui QuNovel anode materials
are of paramount significance for the development
of advanced Li- and K-ions batteries with high energy density, favorable
rate capability, and long lifespan. We herein construct a delicate
three-dimensional (3D) hierarchical porous carbon networks uniformly
decorated with FeSe2 nanodots (FeSe2@PCN) for
fast and stable lithium/potassium storage. The FeSe2@PCN
features a honeycomb-like architecture made up of countless cross-linked
N-doped carbon membranes, which is synthesized via a simple and scalable
gas-pumped self-expanding approach. The well-integrated porous carbon
network (PCN) matrix not only can facilitate ion/electron transportation
and offer sufficient active sites for Li+/K+ adsorption but also accommodate the volumetric change of decorated
FeSe2 nanodots during lithiation/potassiation to maintain
the integrity of electrode materials. Thus, FeSe2@PCN displays
exceptional electrochemical properties for lithium storage in terms
of high capacity (1150 mAh g–1 after 100 cycles
at 200 mA g–1) and outstanding cyclic stability
(232 mAh g–1 after 5000 cycles at 10 A g–1). When further used in KIBs, it delivers a superior capacity of
390 mAh g–1 at 100 mA g–1 and
retains 128 mAh g–1 after 500 cycles at 2 A g–1.