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Single crystal H-NbO growing along the [001] crystal direction for ultrafast lithium storage
Ist Teil von
Journal of materials chemistry. A, Materials for energy and sustainability, 2023-01, Vol.11 (2), p.642-648
Erscheinungsjahr
2023
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Nb
2
O
5
has been deemed as a promising anode candidate for lithium ion batteries due to its fast charge-discharge capability, excellent structural stability, and high safety. Compared with the widely studied orthorhombic Nb
2
O
5
(T-Nb
2
O
5
), the two-phase transition process during the charge/discharge processes in monoclinic Nb
2
O
5
(H-Nb
2
O
5
) results in inadequate cycle stability and rate performance. Herein, the Li storage performance of H-Nb
2
O
5
is optimized by constructing single-crystalline structure
via
a simple and efficient one-pot annealing process. It has been demonstrated that the single-crystalline structure can more effectively maintain the structural integrity as well as suppress the continuous side reactions at the electrode/electrolyte interface in the charge-discharge processes. Besides, the growth along the [001] crystal direction can ensure that Li ions can penetrate directly into the center from the surface in the single-crystalline H-Nb
2
O
5
, resulting in a significantly improved Li
+
diffusion kinetics. As a result, the single-crystalline H-Nb
2
O
5
exhibits ultrahigh rate performance (119.8 mA h g
−1
at 100C) and long cycle durability with a high capacity of 115.6 mA h g
−1
at 25C for 3000 cycles. Besides, single-crystalline H-Nb
2
O
5
can deliver a remarkable areal capacity of 2.96 mA h cm
−2
at a high mass loading of 12 mg cm
−2
. The Li-ion capacitor paired with commercial activated carbon cathode also exhibits an exceptional energy density of 48.4 W h kg
−1
at a high power density of 5.45 kW kg
−1
. This work will further tap the commercial potential of the single-crystalline H-Nb
2
O
5
for fast lithium storage devices.
Single crystal H-Nb
2
O
5
grown along the [001] crystal direction was synthesized by a simple and effective one-pot annealing process. This structure can more effectively maintain structural integrity and significantly improve Li
+
diffusion kinetics.
Sprache
–
Identifikatoren
ISSN: 2050-7488
eISSN: 2050-7496
DOI: 10.1039/d2ta07935f
Titel-ID: cdi_rsc_primary_d2ta07935f
Format
–
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