TiO2/Si composites synthesized by sol–gel method and their improved electrode performance as Li-ion battery anodes

Usui, Hiroyuki; Wasada, Kuniaki; Shimizu, Masahiro

doi:10.1016/j.electacta.2013.08.015

Cited by 42 publications

(32 citation statements)

References 38 publications

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“…Usui et al investigated composites of rutile-type TiO 2 and Si, which were synthesized by a facile solegel method. The binder-free composite electrodes exhibited very high cycle stability >900 cycles and a specific capacity of 710 mAh g À1 [46]. The latter two systems are of course not containing any Sn but show that a mixture of high capacity (e.g.…”

Section: Resultsmentioning

confidence: 98%

High power TiO2 and high capacity Sn-doped TiO2 nanomaterial anodes for lithium-ion batteries

Lübke

Johnson

Makwana

et al. 2015

Journal of Power Sources

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h i g h l i g h t sPhase-pure and Sn-doped TiO 2 nanoparticles (<7 nm) are synthesized via CHFS. The nanomaterial can be used directly after synthesis as a Li-ion battery anode. TiO 2 retains excellent high power performance at current rates up to 10 A g À1 . Doped Sn 4þ in the TiO 2 is electrochemically active. Keywords:Tin doped titania Continuous hydrothermal flow synthesis Lithium ion battery Anatase Anode High power a b s t r a c t A range of phase-pure anatase TiO 2 (~5 nm) and Sn-doped TiO 2 nanoparticles with the formula Ti 1-x Sn x O 2 (where x ¼ 0, 0.06, 0.11 and 0.15) were synthesized using a continuous hydrothermal flow synthesis (CHFS) reactor. Charge/discharge cycling tests were carried out in two different potential ranges of 3 to 1 V and also a wider range of 3 to 0.05 V vs Li/Li þ . In the narrower potential range, the undoped TiO 2 nanoparticles display superior electrochemical performance to all the Sn-doped titania crystallites. In the wider potential range, the Sn-doped samples perform better than undoped TiO 2 . The sample with composition Ti 0.85 Sn 0.15 O 2 , shows a capacity of ca. 350 mAh g À1 at an applied constant current of 100 mA g À1 and a capacity of 192.3 mAh g À1 at a current rate of 1500 mA g À1 . After 500 charge/ discharge cycles (at a high constant current rate of 382 mA g À1 ), the same nanomaterial anode retains a relatively high specific capacity of 240 mAh g À1 . The performance of these nanomaterials is notable, particularly as they are processed into electrodes, directly from the CHFS process (after drying) without any post-synthesis heat-treatment, and they are made without any conductive surface coating.

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Section: Resultsmentioning

confidence: 98%

High power TiO2 and high capacity Sn-doped TiO2 nanomaterial anodes for lithium-ion batteries

Lübke

Johnson

Makwana

et al. 2015

Journal of Power Sources

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“…Consequently, scalable syntheses of low cost and new electrode materials delivering stable and high specific capacity are desirable. Actually, several transition-metal oxides are under investigation for this purpose such as NiO [7,8], Co 3 O 4 [8], CuO [8], Fe 2 O 3 [9][10][11][12] and TiO 2 [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Higher A diminishes the overpotential and increases the reaction at the interface, while smaller L favors the characteristic times  for kinetics in the proportion =L 2 /D + with D + the diffusion coefficient of ions [3,28]. The growth of nanosized TiO 2 powders can be obtained using different synthesis routes such as co-precipitation [33][34][35][36], sol-gel [13], emulsion [16] and hydrothermal methods [31].…”

Section: Introductionmentioning

confidence: 99%

Anatase TiO2 nanoparticles for lithium-ion batteries

El-Deen

Hashem

Abdel-Ghany

et al. 2018

Ionics

113

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International audienceAnatase TiO2 nanoparticles were prepared by a simple sol-gel method at moderate temperature. X-ray powder diffraction (XRD) and Raman spectroscopy revealed the exclusive presence of anatase TiO2 without impurities such as rutile or brookite TiO2. Thermogravimetric analysis confirmed the formation of TiO2 at about 400 °C. Particle size of about 20 nm observed by transmission electron microscopy matches well with the dimension of crystallites calculated from XRD. The electrochemical tests of the sol-gel-prepared anatase TiO2 show promising results as electrode for lithium-ion batteries with a stable specific capacity of 174 mAh g−1 after 30 cycles at C/10 rate. The results show that improvement of the electrochemical properties of TiO2 to reach the performance required for use as an electrode for lithium-ion batteries requires not only nanosized porous particles but also a morphology that prevents the self-aggregation of the particles during cycling

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“…All of these redox peaks are consistent with previous reports . In addition, after the first cycle, peaks showing in the anodic sweep at around 1.0 V and cathodic sweep range of 1.1–1.5 V are attributed to the lithiation/delithiation of titania . More than one redox peak of titania is observed; this may be ascribed to the polycrystalline nature of the titania coating layer .…”

Section: Resultsmentioning

confidence: 99%

A Bioinspired Nanofibrous Titania/Silicon Composite as an Anode Material for Lithium‐Ion Batteries

2017

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A hierarchical nanofibrous titania/silicon composite composed of anatase titania nanoparticles anchored as a thin coating layer on the surface of a silicon nanofiber was synthesized by employing natural cellulose substance (e.g., commercial laboratory filter paper) as a template. It was obtained through magnesiothermic reduction of the titania/silica replica of a cellulose substance prepared by a sol–gel process. When used as an anode material for lithium‐ion batteries, it showed improved electrochemical performances that were superior to those of the bare silicon counterpart, and which improved with increasing titania content in the composites. For the composite with 54.3 wt % titania and titania nanoparticles with sizes of about 12 nm, it delivered a specific capacity of 498.9 mA h g−1 after 200 charge/discharge cycles at a current density of 200 mA g−1. The enhanced electrochemical performances of the composite are attributed to its unique network structure, as well as the buffering effect of the titania coating layer for huge volume changes to the silicon fiber during repeated lithiation and delithiation processes.

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TiO2/Si composites synthesized by sol–gel method and their improved electrode performance as Li-ion battery anodes

Cited by 42 publications

References 38 publications

High power TiO2 and high capacity Sn-doped TiO2 nanomaterial anodes for lithium-ion batteries

High power TiO2 and high capacity Sn-doped TiO2 nanomaterial anodes for lithium-ion batteries

Anatase TiO2 nanoparticles for lithium-ion batteries

A Bioinspired Nanofibrous Titania/Silicon Composite as an Anode Material for Lithium‐Ion Batteries

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