High Lithium Insertion Voltage Single‐Crystal H₂Ti₁₂O₂₅ Nanorods as a High‐Capacity and High‐Rate Lithium‐Ion Battery Anode Material

Abstract

H2Ti12O25 holds great promise as a high‐voltage anode material for advanced lithium‐ion battery applications. To enhance its electrochemical performance, control of the crystal orientation and morphology is an effective way to cope with slow Li+‐ion diffusion inside H2Ti12O25 with severe anisotropy. In this report, Na2Ti6O13 nanorods, prepared from Na2CO3 and anatase TiO2 in molten NaCl medium, were used as a precursor in the synthesis of long single‐crystal H2Ti12O25 nanorods with reactive facets. The as‐prepared H2Ti12O25 nanorods with a diameter of 100–200 nm showed higher charge (extraction) specific capacity and better rate performance than previously reported systems. The reversible capacity of H2Ti12O25 was 219.8 mAh g−1 at 1C after 100 cycles, 172.1 mAh g−1 at 10C, and 144.4 mAh g−1 at 20C after 200 cycles; these values are higher than those of H2Ti12O25 prepared by the conventional soft‐chemical method. Moreover, the as‐prepared H2Ti12O25 nanorods exhibited superior cycle stability with more than 94 % retention of capacity with nearly 100 % coulombic efficiency after 100 cycles at 1C. On the basis of the above results, long single‐crystal H2Ti12O25 nanorods synthesized in molten NaCl with outstanding electrochemical characteristics hold a significant amount of promise for hybrid electric vehicles and energy‐storage systems.

Investigation the sodium storage kinetics of H1.07Ti1.73O4@rGO composites for high rate and long cycle performance

“…[12][13][14][15][16][17][18][19][20][21][22][23] Various Li/ Na 4x/3 Ti 2−x/3 O 4 compounds have been extensively studied as anode materials of SIBs. [24][25][26][27][28][29][30][31][32][33][34][35][36] However, the plateau of sodium titanium oxides (NTO) is nearly 1 V. 37 Therefore, the potential of full battery with NTO as the anode is only 2.5 V, leading to a low-energy density. 27 Two-dimensional (2D) materials exhibit their advantages in energy storage and conversion devices.…”

“…Titanium (Ti)‐based material is an insertion type material used as the anode of LIBs and SIBs 12–23 . Various Li/Na 4 x /3 Ti 2− x /3 O 4 compounds have been extensively studied as anode materials of SIBs 24–36 . However, the plateau of sodium titanium oxides (NTO) is nearly 1 V 37 .…”

Emerging Layered Metallic Vanadium Disulfide for Rechargeable Metal‐Ion Batteries: Progress and Opportunities

“…According to previous investigations,t he effect of crystal structures on electrochemical performance can primarily be divided into fivea spects:c rystallinity, [162][163][164] orientation, [165] layer structure (number and interlayer spacing), [146,[166][167][168] lattice defects, [169,170] and phase types. [171][172][173] Interestingly,i th as also been reported that ac rystal structure (high crystallinity) with a periodic lattice and ordered arrangement of atoms, [174][175][176][177][178][179][180] and an amorphous (low crystallinity)s tructure with abundant po-tential active sites on the surface/interface ands mall specific mass, [181][182][183][184][185][186][187] can enhancet he electrochemical performance, to ac ertain degree, which causes great confusion to researchers. It is thus highly desirable to summarize and clarify the effect of the crystallinity of the structure on the electrochemical performance of VS 2 .…”

Recent Progress on Molybdenum Oxides for Rechargeable Batteries

“…[6][7][8] Thus, the formationo fn ovel materials at the nanoscale level considerably enhancer echargeableb atteries with ah igh specific capacity,g ood rate capability,a nd long life. Nanostructured electrode materials may shorten the transport lengths for electrons and ions, improve effective active sites, and control volumer eduction.…”

“…Nanostructured electrode materials may shorten the transport lengths for electrons and ions, improve effective active sites, and control volumer eduction. [6][7][8] Thus, the formationo fn ovel materials at the nanoscale level considerably enhancer echargeableb atteries with ah igh specific capacity,g ood rate capability,a nd long life. It is assumed that we can further revolutionize battery systems by synthesizing innovative materials throught he field of nanochemistry.…”