TY - JOUR
T1 - Bronze titanium dioxide nanowires with N-rich pseudocapacitive surfaces toward improved lithium kinetics and charge storage
AU - Kim, Ryounghee
AU - Choi, Jae Man
AU - Choi, Dongkyu
AU - Lim, Seonguk
AU - Song, Min Sang
AU - Han, Dongwook
N1 - Publisher Copyright:
© 2021 John Wiley & Sons Ltd.
PY - 2022/4
Y1 - 2022/4
N2 - Pseudocapacitive processes involve faradaic charge transfers for the energy storage of electrode materials. As the number of charge storage locations on the surface of electrode materials increases upon nano-sizing active particles, such processes have become increasingly important with advancements in nanotechnology. To improve the electrochemical performance of bronze titanium dioxide (TiO2(B)), a promising pseudocapacitive anode material for Li-ion batteries, namely, TiO2(B) nanowires, with N-rich pseudocapacitive surfaces is developed through mild thermal nitridation. Preserving the bronze phase of TiO2(B) nanowires during nitridation is generally challenging because the crystal structure of TiO2(B) is metastable, and nanowire-shaped active particles with large surface areas are highly reactive. Nevertheless, the resulting TiO2(B) nanowires retain their original bronze phase and exhibit remarkable electrochemical performance (charge capacity: 92 mA h g−1 @ 20 C; capacity retention: 76.4% @ 1 C after 100 cycles). Moreover, the initial coulombic efficiency of the TiO2(B) nanowires is improved because the N-rich surface can suppress the reductive decomposition of electrolyte. This work demonstrates that an N-rich pseudocapacitive surface can promote the Li kinetics of TiO2(B) nanowires and that newly formed O-Ti-N linkages developed via surface nitridation can improve the electronic conduction and enhance the structural/electrochemical stability of the surface.
AB - Pseudocapacitive processes involve faradaic charge transfers for the energy storage of electrode materials. As the number of charge storage locations on the surface of electrode materials increases upon nano-sizing active particles, such processes have become increasingly important with advancements in nanotechnology. To improve the electrochemical performance of bronze titanium dioxide (TiO2(B)), a promising pseudocapacitive anode material for Li-ion batteries, namely, TiO2(B) nanowires, with N-rich pseudocapacitive surfaces is developed through mild thermal nitridation. Preserving the bronze phase of TiO2(B) nanowires during nitridation is generally challenging because the crystal structure of TiO2(B) is metastable, and nanowire-shaped active particles with large surface areas are highly reactive. Nevertheless, the resulting TiO2(B) nanowires retain their original bronze phase and exhibit remarkable electrochemical performance (charge capacity: 92 mA h g−1 @ 20 C; capacity retention: 76.4% @ 1 C after 100 cycles). Moreover, the initial coulombic efficiency of the TiO2(B) nanowires is improved because the N-rich surface can suppress the reductive decomposition of electrolyte. This work demonstrates that an N-rich pseudocapacitive surface can promote the Li kinetics of TiO2(B) nanowires and that newly formed O-Ti-N linkages developed via surface nitridation can improve the electronic conduction and enhance the structural/electrochemical stability of the surface.
KW - anode materials
KW - bronze TiO(B) nanowires
KW - Li-ion batteries
KW - pseudocapacitive charge storage
KW - superior Li-ion kinetics
KW - surface nitridation
UR - http://www.scopus.com/inward/record.url?scp=85120428011&partnerID=8YFLogxK
U2 - 10.1002/er.7533
DO - 10.1002/er.7533
M3 - Article
AN - SCOPUS:85120428011
SN - 0363-907X
VL - 46
SP - 5955
EP - 5962
JO - International Journal of Energy Research
JF - International Journal of Energy Research
IS - 5
ER -