Nanostructured negative electrodes based on titania for Li-ion microbatteries

Djenizian, Thierry; Hanzu, Ilie; Knauth, Philippe

doi:10.1039/c0jm04205f

Cited by 114 publications

(79 citation statements)

References 180 publications

(166 reference statements)

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“…This suggests that Si in porous layers is not suitable as an active material and may cause a low initial charge/discharge capacity. The deposition of TiO 2 on the surfaces of PSi fine pores is an effective method of overcoming this disadvantage; TiO 2 is a superhydrophilic material [15][16][17][18]24] and a useful Li-storage material, and therefore the effective surface area of PSi for use as an electrode will be increased by TiO 2 deposition. In this work, a novel LPD method in which the F À scavenger was not boric acid, but the oxidized PSi surface or Si surface at the anodic potential, was developed for the fabrication of TiO 2 /PSi nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

“…When a TiO 2 electrode is used as the LIB anode, the theoretical capacity is 170 mA h g À1 and the operating voltage is 1.75 V vs. Li/ Li + [15,16], so the TiO 2 electrode is inferior to a graphite electrode (372 mA h g À1 ) in terms of capacity and energy density. However, TiO 2 can absorb Li with slight volume expansion; therefore TiO 2 can be used as an anode material with a satisfactory cycling performance and safety [17,18].…”

Section: Introductionmentioning

confidence: 99%

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On-site fabrication and charge–discharge property of TiO2 coated porous silicon electrode by the liquid phase deposition with anodic oxidation

Mizuhata

Katayama

Maki

2015

Journal of Fluorine Chemistry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On-site fabrication and charge–discharge property of TiO2 coated porous silicon electrode by the liquid phase deposition with anodic oxidation

Mizuhata

Katayama

Maki

2015

Journal of Fluorine Chemistry

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“…Excellent performance has been reported in various energy storage and conversion applications: to give just a few examples, nanostructured oxide electrodes enable reduction of the operating temperature in solid oxide fuel cells [4]; significantly higher insertion capacity and better cycling have been demonstrated for nanostructured oxide electrodes in lithium-ion batteries [5,6]; nanostructured electrodes improve the performance of dyesensitized solar cells by several orders of magnitude compared to bulk electrodes [7,8].…”

Section: Introductionmentioning

confidence: 99%

Study of compaction and sintering of nanosized oxide powders by in situ electrical measurements and dilatometry: Nano CeO2—case study

et al. 2014

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Densification and sintering of CeO 2 nanoparticles and their electrical properties were simultaneously studied as a function of temperature in controlled atmosphere using a modified dilatometer. CeO 2 nanoparticles simultaneously shrink and become more resistive upon initial heating, associated with desorption of water. The electrical conductance G at 300-550°C revealed a pO 2 dependence described by log (G)=A+n×log (pO 2 ) with n~−1/6, consistent with n-type conduction. The results were analyzed with a defect equilibrium model based on the reduction of ceria and formation of doubly ionized oxygen vacancies and electrons. The activation energy was found equal to (1.3±0.1) eV, which results in an enthalpy of reduction of (2.7±0.4) eV, considerably lower than that for bulk ceria (~4.5 eV). The coarsening of particles during heat treatment at 800°C were analysed assuming grain boundary diffusion-limited sintering. Although the coarsened powder shows a similar pO 2 dependence, the activation energy was considerably higher (1.9±0.1) eV, leading to a reduction enthalpy of (4.5±0.4) eV. The decrease in the enthalpy of reduction with decreasing particle size is consistent with the increasing fraction of oxide ions residing at the surface. Alternate interpretations based on space charge effects and surface adsorption/desorption were considered and found to be less consistent with the experimental results.

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“…TiO 2 + χLi + + χe -↔ Li χ TiO 2 (1) When TiO 2 electrode is used as LIB anode, the theoretical capacity is 170 mAhg -1 and operating voltage is 1.75 V vs. Li + /Li (6,7). Therefore, it can be estimated that TiO 2 electrode is inferior as compared with graphite (372 mAhg -1 ) from the aspect of capacity and energy density.…”

Section: Introductionmentioning

confidence: 98%

Metal Oxide Coated Porous Silicon Electrode Fabricated by Anodized Liquid Phase Depositions

2014

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The titanium oxide/PSi nanocomposite was fablicated by liquid phase deposition (LPD) method with applying anodic potential. Results of SEM-EDX measurement showed that TiO 2 deposited into the fine pore (ca. 7.4 nm) only when oxidized PSi surface was used as F -scavenger or PSi was anodized under the existence of titanium ions. TiO 2 /PSi nanocomposite was fabricated by anodization of PSi in H 2 TiF 6 electrolyte under constant potential. As the amount of Ti maximized at 300 mV vs. Ag/AgCl, deposition process can be controlled by applied potential in this method. The charge/discharge capacities were measured for fabricated TiO 2 /PSi as lithium-ion battery anode. The improvement of the capacity was derived from the increase in PSi wettability by TiO 2 deposition and activation of silicon in fine structure. In addition, TiO 2 /PSi fabricated by anodization kept higher capacity without rapid degradation, because of free from SiO 2 .

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Nanostructured negative electrodes based on titania for Li-ion microbatteries

Cited by 114 publications

References 180 publications

On-site fabrication and charge–discharge property of TiO2 coated porous silicon electrode by the liquid phase deposition with anodic oxidation

On-site fabrication and charge–discharge property of TiO2 coated porous silicon electrode by the liquid phase deposition with anodic oxidation

Study of compaction and sintering of nanosized oxide powders by in situ electrical measurements and dilatometry: Nano CeO2—case study

Metal Oxide Coated Porous Silicon Electrode Fabricated by Anodized Liquid Phase Depositions

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