Intrinsically Coupled 3D nGs@CNTs Frameworks as Anode
Materials for Lithium-Ion Batteries
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Abstract
Acquiring high-quality integrated
nanographene sheets (nGs) and
mitigating their self-aggregation are highly essential to achieving
their full potential in energy related applications. The insertion
of enthetic spacers into nGs layers can relieve the stacking problems
but always results in a change in the intrinsic properties of the
nGs and/or the introduction of complexity at the interfaces. In this
work, a facile and scalable strategy is used to construct highly integrated,
intrinsically coupled, N, S-doped 3D nanographene sheets trapped within
carbon nanotubes (nGs@CNTs) through a modified counterion intercalation.
The as-obtained nGs@CNTs are composed of two building blocks, in which
large amounts of integrated unzipped nanoscale graphene sheets are
tightly attached to the intact inner walls of the CNTs. The remaining
CNTs serve as inherent spacers to prevent the self-stacking of nGs.
Benefiting from the permanent and robust column bracing frameworks,
the resultant 3D aerogels are expected to act as effective electrode
materials for lithium-ion batteries with superior cyclic performance,
delivering a reversible capacity as high as 1089 mAh g<sup>โ1</sup> at a current density of 2 A g<sup>โ1</sup> even after 300
cycles. The good lithium-ion storage performance is attributed to
the hierarchical porous feature, the intrinsically unstacked bridged
structure, and the synergistic effects between the N and S. This promising
strategy represents a new concept for mitigating the self-aggregation
of nGs by using autologous spacers