Crystallinity‐Controlled Titanium Oxide–Carbon Nanocomposites with Enhanced Lithium Storage Performance

Abstract

Nanocomposites of crystalline-controlled TiO(2) -carbon are prepared by a novel one-step approach and applied in anodes of lithium ion batteries. In our nanocomposite anodes, the Li(+) capacity contribution from the TiO(2) phase was enormous, above 400 mAh g(-1) (Li(1+x) TiO(2) , x>0.2), and the volumetric capacity was as high as 877 mAh cm(-3) with full voltage utilization to 0 V versus Li/Li(+) , which resulted in higher energy density than that of state-of-the-art titania anodes. For the first time, it was clearly revealed that the capacity at 1.2 and 2.0 V corresponded to Li(+) storage at amorphous and crystalline TiO(2) , respectively. Furthermore, improvements in the rate capability and cycle performance were observed; this was attributed to resistance reduction induced by higher electrical/Li(+) conduction and faster Li(+) diffusion.

Engineering the Electrochemical Capacitive Properties of Graphene Sheets in Ionic‐Liquid Electrolytes by Correct Selection of Anions

“…[1][2][3] Supercapacitors, also known as electrochemical capacitors, are widely recognized as an important class of energy-storage devices that can fill in the gap between batteries and conventional capacitors. [1][2][3] Supercapacitors, also known as electrochemical capacitors, are widely recognized as an important class of energy-storage devices that can fill in the gap between batteries and conventional capacitors.…”

Reduced Graphite Oxide/Nano Sn: A Superior Composite Anode Material for Rechargeable Lithium‐Ion Batteries

“…[1] The next generation of lithium-ion batteries requires improved anode and cathode materials with higher energy densities than existing electrode materials. [2][3][4][5] Recently anodes based on metals such as tin, [6] antimony, [7] and silicon, [8] have been extensively investigated. Tin-based anodes have received much attention because tin undergoes smaller volume expansion [9] than silicon or antimony.…”

Ordered Mesoporous Carbon-MoO2Nanocomposite as High Performance Anode Material in Lithium Ion Batteries

“…2,17,19,20 Especially, nanocomposites between transient metal oxides and ordered mesoporous carbon (OMC) have become more attractive due to their beneficial characteristics: i) abundant lithium storage sites and fast lithium diffusion in nanosized metal oxides and OMC; ii) facile electrolyte penetration owing to ordered mesopores iii) higher electric conductivity through carbon framework. 2,17,19,20 As a novel metal-oxide anode candidate, molybdenum oxides (MoO x , x = 2-3), which possess a theoretical specific capacity of 840-1100 mAh g -1 based on the mechanism of conversion reaction, have attracted considerable interest as anode material materials in LIBs.3,4 However, it has been elucidated that in bulk MoO x electrodes, only addition-type lithium storage reaction happens rather than conversion reaction, which leads to quite limited specific capacity and their intrinsically low electric and ionic conductivity retards their rate performance.4,5 Accordingly, nanostructured MoO x anodes of various forms (nanobelts, nanorods and nanoporous structures) have been prepared and great improvement has been observed. [4][5][6] Particularly, the ordered mesoporous MoO 2 templated from the KIT-6 silica has been reported, which exhibited largely enhanced anode performance.…”

“…2,17,19,20 Especially, nanocomposites between transient metal oxides and ordered mesoporous carbon (OMC) have become more attractive due to their beneficial characteristics: i) abundant lithium storage sites and fast lithium diffusion in nanosized metal oxides and OMC; ii) facile electrolyte penetration owing to ordered mesopores iii) higher electric conductivity through carbon framework. 2,17,19,20 As a novel metal-oxide anode candidate, molybdenum oxides (MoO x , x = 2-3), which possess a theoretical specific capacity of 840-1100 mAh g -1 based on the mechanism of conversion reaction, have attracted considerable interest as anode material materials in LIBs.…”

“…It is expected that the mesoporous structure provides the high electrolyte penetration through the tubular-like nanopores and short lithium diffusion paths within the nanosized wall, and meanwhile the carbon wall functions as a conductive framework. 2,17,19,20 As listed in Table 1, adsorbed N 2 volume became gradually smaller with an increase of MoO 2 fraction, which resulted in the decrease of measured BET surface areas from 640 to 381 m 2 g…”