TiO2 flakes as anode materials for Li-ion-batteries

Yang, Ming-Che; Lee, Yang-Yao; Xu, Bo; Powers, Kevin; Meng, Ying Shirley

doi:10.1016/j.jpowsour.2012.01.155

Cited by 84 publications

(60 citation statements)

References 30 publications

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“…The nanorods were cycled 800 times at 0.9C rate (150 mA g −1 ) achieving 81% capacity retention and an impressive specific capacity of 140 mA h g −1 at the end of cycling. Yang, et al [102] synthesized 40 nm thick nanoflakes by spreading a mixture of stearic acid, low surface tension hydrocarbon and titanium n-butoxide on the surface of high purity water to form a slurry, which was then calcined at 400°C. The resulting flakes were then cycled at C/20 20 times.…”

Section: Anatasementioning

confidence: 99%

Novel Mesoporous Nanotitania/Carbon Composite Electrodes for Electrochemical Energy Storage

et al. 2013

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The development of novel scalable nanoscale materials and fabrication techniques for high performance TiO 2 Li-ion electrodes is investigated in this thesis. The development and study of the novel fabrication methods is approached from the stand point of a binder-free electrode, and its comparison to standard binder-based electrodes, making use of commercial P25 TiO 2 product as active material. The characterization of novel titania synthesized by manipulating the parameters of an aqueous process, is performed for two phases of TiO 2 , namely anatase and brookite, based on comprehensive nanocrystal morphological and electrochemical property assessment. Finally all is brought together by investigating the application of the novel fabrication protocol to the aqueous synthesized anatase to engineer binderfree 3-dimensional electrodes, and studying their Li-ion intercalation performance.The fabrication of binder-free P25 nanotitania/carbon composite electrodes is pursued via formulating pastes and controlled sintering yielding enhanced electrochemical performance in comparison to standard binder-based methods using the same active and conductive components. The new paste formulation and sintering sequence provides a significant increase in dispersion of carbon due to smaller agglomerate size resulting in enhanced inter-particle (active-conduction) mixing and packing density than standard binder-based electrodes. Cyclic voltammetry and galvanostatic charge/discharge proved that the binder-free electrodes possess improved conductivity, specific capacity, and reversibility, as compared to binderbased electrodes. Most significantly, the capacity retention of the binder-free electrode was much higher than that of the binder-based electrode at 94 and 53%, respectively.iii Using an aqueous solution based synthesis process, 2-dimensional brookite nanoplatelets and 6 nm anatase nanoparticles are obtained and examined for their physical and electrochemical properties as Li-ion host materials. Brookite, itself is particularly interesting, as it is the least understood of the nanoscale TiO 2 phases, especially in the form of 2-D crystal structures that are deemed advantageous for Liion diffusion. This study provides insight into the lithiation mechanism of brookite, concluding that a solid-solution is formed upon lithiation corresponding to Li 0.5 TiO 2 that is isostructural with brookite. Further, the brookite nanoplatelets are discovered to undergo unique crystal structure enhancement upon cycling that allows them to quickly relax upon delithiation in an extremely efficient (>99.7% Coulombic efficiency) reversible manner translating to excellent Li-ion intercalation stability.Anatase nanoparticle are described in terms of crystallinity and surface area. Asprepared anatase has low crystallinity (∼70%), but high surface area (∼222 m 2 g −1 ), and when annealed at 300°C, the crystallinity increases to ∼90% but the surface area drops to 120 m 2 g −1 . Electrochemically, this allows the annealed sample with higher crystall...

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Section: Anatasementioning

confidence: 99%

Novel Mesoporous Nanotitania/Carbon Composite Electrodes for Electrochemical Energy Storage

et al. 2013

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“…One of these approaches involves microstructural manipulation; creating nanospheres, nanofibers, nanoflakes, and nanopowders of TiO 2 to improve the electrochemical performance [20,31,32]. Among these design techniques, perhaps the design and use of one-dimensional (1D) nanostructures such as TiO 2 nanofibers are the most popular methods employed to improve the electrochemical performance of TiO 2 based anodes [18,23,33e35].…”

Section: Introductionmentioning

confidence: 99%

Multichannel hollow structure for improved electrochemical performance of TiO 2 /Carbon composite nanofibers as anodes for lithium ion batteries

Zúñiga

Agubra

Flores

et al. 2016

Journal of Alloys and Compounds

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“…Transition metal oxides as anode materials in LIBs can deliver reversible lithium storage capacity of 2~3 times higher than that of commercial graphite [8][9][10] . As we know, (i) although its theory capacity is only 336 mAh g -1 , TiO 2 electrodes are based on embedded-emergence reaction in the charge-discharge cycles, resulting in little volume expansion [11][12][13] ; (ii) the other transition metal oxide (e.g. NiO, Fe 3 O 4 and Co 3 O 4 ) has many advantages such as high theoretical capacities, these electrodes are based on the conversion reaction in the chargedischarge cycles, resulting in a large volume expansion and poor capacity retention [14][15][16][17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

Ternary perovskite nickel titanate/reduced graphene oxide nano-composite with improved lithium storage properties

Fan

Xiao

et al. 2016

RSC Adv.

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As anode materials, TiO2 exhibits a suitable potential, fast kinetics and excellent cycling performance, while other transition metal oxides (such as NiO) deliver a much higher theoretical capacity with a moderate kinetics and limited cycling performance. Herein, a novel perovskite NiTiO3/reduced graphene oxide (RGO) composite with a particle size of 40-50 nm was first synthesized by solvothermal method and introduced as anode materials for lithium-ion batteries. The structure morphology and electrochemical performance of NiTiO3/RGO nanocomposite were investigated by X-ray diffraction (XRD), Raman spectroscopy measurements, scanning electron microscopy (SEM), transmission electron microscopy (TEM), galvanostatic charge-discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests. The NiTiO3/RGO nanocomposite delivers a higher discharge capacity (1110.7 mAh g -1 ) and better cycling stability (65.3 %), as well as improved rate capability over 50 cycles, compared with those of bare NiTiO3. The improved electrochemical properties of NiTiO3/RGO can be attributed to the good conductivity and large surface of RGO and the combination nanostructure of NiTiO3 and RGO.

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TiO2 flakes as anode materials for Li-ion-batteries

Cited by 84 publications

References 30 publications

Novel Mesoporous Nanotitania/Carbon Composite Electrodes for Electrochemical Energy Storage

Novel Mesoporous Nanotitania/Carbon Composite Electrodes for Electrochemical Energy Storage

Multichannel hollow structure for improved electrochemical performance of TiO 2 /Carbon composite nanofibers as anodes for lithium ion batteries

Ternary perovskite nickel titanate/reduced graphene oxide nano-composite with improved lithium storage properties

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