%0 Journal Article
%A Liu, Jinlong
%A Wang, Zhenyu
%A Lu, Zhouguang
%A Zhang, Lei
%A Xie, Fangxi
%A Vasileff, Anthony
%A Qiao, Shi-Zhang
%D 2019
%T Efficient Surface Modulation of Single-Crystalline
Na2Ti3O7 Nanotube Arrays with Ti3+ Self-Doping toward Superior Sodium Storage
%U https://acs.figshare.com/articles/journal_contribution/Efficient_Surface_Modulation_of_Single-Crystalline_Na_sub_2_sub_Ti_sub_3_sub_O_sub_7_sub_Nanotube_Arrays_with_Ti_sup_3_sup_Self-Doping_toward_Superior_Sodium_Storage/9744989
%R 10.1021/acsmaterialslett.9b00213.s001
%2 https://acs.figshare.com/ndownloader/files/17452877
%K SIB
%K Efficient Surface Modulation
%K Na 2 Ti 3 O 7
%K Na 2 Ti 3 O 7 nanotube arrays
%K surface modification
%K electrode
%K NH
%K Single-Crystalline Na 2 Ti 3 O 7 Nanotube Arrays
%K Superior Sodium Storage
%X Although
Na2Ti3O7-based anodes
have been widely investigated in sodium-ion batteries (SIBs), their
Na+ storage properties especially high-rate capability
and long-term cycling durability are far from practical application,
because of their intrinsic low conductivity and unsatisfied Na+ diffusion resistance. Here, we report the surface engineering
of Na2Ti3O7 nanotube arrays grown
in situ on Ti foil through a hydrothermal method and subsequent NH3-assisted calcination. Benefiting from the effective surface
modification, the as-derived free-standing electrode possesses highly
crystalline surface with favorable Na+ diffusion kinetics
and self-incorporation of abundant Ti3+ for improved electronic
conductivity. These features enable the electrode to achieve remarkable
reversible capacity (237.9 mAh g–1), ultra-high
rate capability (88.5 mAh g–1 at 100 C = 17.7 A
g–1), and excellent cycling stability (92.32% capacity
retention at 50 C after 5000 cycles), which are superior to the counterpart
without surface modification, as well as almost all Na2Ti3O7-based anode materials reported so far
for SIBs. The outstanding electrochemical performance demonstrates
the feasibility of proposed surface modulation in designing more efficient
electrode materials for energy storage.
%I ACS Publications