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3D-Printed Sodiophilic V2CTx/rGO-CNT MXene Microgrid Aerogel for Stable Na Metal Anode with High Areal Capacity
journal contribution
posted on 2022-06-06, 19:05 authored by Zixuan Wang, Zhenxin Huang, Hui Wang, Weidong Li, Bingyan Wang, Junmin Xu, Tingting Xu, Jinhao Zang, Dezhi Kong, Xinjian Li, Hui Ying Yang, Ye WangFeaturing
a high theoretical capacity, low cost, and abundant resources,
sodium metal has emerged as an ideal anode material for sodium ion
batteries. However, the real feasibility of sodium metal anodes is
still hampered by the uncontrolled sodium dendrite problems. Herein,
an artificial three-dimensional (3D) hierarchical porous sodiophilic
V2CTx/rGO-CNT microgrid aerogel
is fabricated by a direct-ink writing 3D printing technology and further
adopted as the matrix of Na metal to deliver a Na@V2CTx/rGO-CNT sodium metal anode. Upon cycling,
the V2CTx/rGO-CNT electrode
can yield a superior cycling life of more than 3000 h (2 mA cm–2, 10 mAh cm–2) with an average Coulombic
efficiency of 99.54%. More attractively, it can even sustain a stable
operation over 900 h at 5 mA cm–2 with an ultrahigh
areal capacity of 50 mAh cm–2. In situ and ex situ characterizations
and density functional theory simulation analyses prove that V2CTx with abundant sodiophilic
functional groups can effectively guide the sodium metal nucleation
and uniform deposition, thus enabling a dendrite-free morphology.
Moreover, a full cell pairing a Na@V2CTx/rGO-CNT anode with a Na3V2(PO4)3@C-rGO cathode can deliver a high reversible capacity
of 86.27 mAh g–1 after 400 cycles at 100 mA g–1. This work not only clarifies the superior Na deposition
chemistry on the sodiophilic V2CTx/rGO-CNT microgrid aerogel electrode but also offers an approach
for fabricating advanced Na metal anodes via a 3D
printing method.
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ultrahigh areal capacityhigh theoretical capacityhigh reversible capacityfull cell pairingaverage coulombic efficiencysodium ion batteriessuperior cycling lifeideal anode materialcnt microgrid aerogelsodium metal nucleationsodium metal anodes50 mah cm3d printing method27 mah g3 subprinted sodiophilic v2 subsodium metalcnt anodeupon cyclingsodiophilic vx via situ ex cnt electrodesub ><> subuniform depositionthus enablingstill hamperedstable operationrgo cathodereal feasibilityna metallow costfree morphologyeven sustaineffectively guideartificial threealso offersabundant resources900 h54 %.400 cycles3000 h