Enhanced lithium ion storage in TiO2 nanoparticles, induced by sulphur and carbon co-doping

Ivanov, Svetlozar; Barylyak, Adriana; Besaha, Khrystyna; Dimitrova, A.; Krischok, S.; Bund, Andreas; Bobitski, Jaroslav

doi:10.1016/j.jpowsour.2016.06.116

Cited by 27 publications

(28 citation statements)

References 54 publications

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“…Titanium dioxide (TiO 2 ), which is another highly interested wide band-gap semiconductor, is selected for this study due to its easy availability and numerous applications [43]. TiO 2 itself has also been studied as an anode material for LIBs, with the redox potential of ~ 1.8 V vs. Li/Li + [44]. In fact, the use of TiO 2 in LiCoO 2 coating has been attempted by a few researchers with wet-chemical and ALD approaches.…”

Section: Introduction：mentioning

confidence: 99%

Sputtering TiO2 on LiCoO2 composite electrodes as a simple and effective coating to enhance high-voltage cathode performance

Zhou

Wang

et al. 2017

Journal of Power Sources

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Surface coating is a key strategy in lithium-ion battery technologies to achieve a high and stable battery performance. Increasing the operation voltage is a direct way to increase the energy density of the battery. In this work, TiO 2 is directly sputtered on as-fabricated LiCoO 2 composite electrodes, enabling a controllable oxide coating on the topmost of the electrode. With an optimum coating, the discharge capacity is able to reach 160 mAh g-1 (86.5 % retention) after 100 cycles within 3.0-4.5 V at 1 C, which is increased by 40 % compared to that of the bare electrode. The high-voltage rate capability of LiCoO 2 is also remarkably enhanced after TiO 2-coating as reflected by the much larger capacity at 10 C (109 vs. 74 mAh g-1). The artificially introduced oxide coating is believed to make the LiCoO 2 electrode more resistant to interfacial side reactions at high voltage and thus minimizes the irreversible loss of the active material upon long cycling. The TiO 2 coating layer is also possible to partially react with the decomposition product of electrolyte (e.g. HF) and form a more stable and conductive interphase containing TiF x , which is responsible for the improvement of the rate capability.

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Section: Introduction：mentioning

confidence: 99%

Sputtering TiO2 on LiCoO2 composite electrodes as a simple and effective coating to enhance high-voltage cathode performance

Zhou

Wang

et al. 2017

Journal of Power Sources

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“…2(a-c), after the hydrogenation at RT and 573 K, the Ti 4+ (2p 3/2 ) peak moves to 459.5 eV and 458.7 eV, respectively in accordance with the previous results 38 . It has been reported B i n d i n g E n e r g y ( e V ) that under certain circumstances Ti 2+ states can be observed in black titania 39,40 . By increasing temperature during the plasma treatment caused a Ti 2+ state to appear.…”

Section: Resultsmentioning

confidence: 99%

Experimental and Theoretical Study of Electronic and Hyperfine Properties of Hydrogenated Anatase (TiO₂): Defect Interplay and Thermal Stability

et al. 2020

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Performance of TiO2-based materials is highly dependent on the electronic structure and local defect configurations. Hence, a thorough understanding of defects interaction plays a key role. In this study we report on the results from emission 57 Fe Mössbauer Spectroscopy experiments, using dilute 57 Mn implantation into pristine (TiO2) and hydrogenated anatase held at temperatures between 300-700 K. Results of the electronic structure and local environment are complemented with ab-initio calculations. Upon implantation both Fe 2+ and Fe 3+ are observed in pristine anatase, where the latter demonstrates the spin-lattice relaxation. The spectra obtained for hydrogenated anatase show no Fe 3+ contribution, suggesting that hydrogen acts as a donor. Due to the low threshold, hydrogen diffuses out of the lattice. Thus showing a dynamic behaviour on the time scale of the 57 Fe 14.4 keV state. The surrounding oxygen vacancies favor the high-spin Fe 2+ state. The sample treated at room temperature shows two distinct processes of hydrogen motion. The motion commences with the interstitial hydrogen, followed by switching to the covalently bound state. Hydrogen out-diffusion is hindered by bulk defects, which could cause both processes to overlap. Supplementary UV-Vis and electrical conductivity measurements show an improved electrical conductivity and higher optical absorption after the hydrogenation. X-ray photoelectron spectroscopy at room temperature reveals that the sample hydrogenated at 573 K shows presence of both Ti 3+ and Ti 2+ states. This could imply that a significant amount of oxygen vacancies and -OH bonds are present in the samples. Theory suggests that in the anatase sample implanted with Mn(Fe), probes were located near equatorial vacancies as next-nearest-neighbours, whilst a metastable hydrogen configuration is responsible for the annealing behaviour. The obtained information provides a deep insight into elusive hydrogen defects and their thermal stability.

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“…In addition to the observation on the intensities reduction (Figure 2a), the observed peak broadening (Figure 2b) and deconvolution of peaks (Figure 2c-e) in the XRD pattern is also another indication that can be discussed in parallel to the phase identification. These phenomena, however, are often related to structural alteration due to the presence of non-uniform strain, posed by the substitutional and interstitial dopants [39,40]. Similarly, the work by Chen et al [33] also utilise the phase analysis in investigating the Fe 3+ -doped TiO 2 nanoparticles.…”

Section: Phase and Structural Characterisationmentioning

confidence: 99%

Recent Characterisation of Sol-Gel Synthesised TiO2 Nanoparticles

Yahaya¹,

Azam²,

Mat-Teridi³

et al. 2017

Recent Applications in Sol-Gel Synthesis

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High demand and current applications have led to continuous study and subsequent improvement of TiO 2 nanoparticles. The versatility of the sol-gel method allows employing different process parameters to influence the resultant properties of TiO 2 nanoparticles. The evaluation and characterisation process of the synthesised TiO 2 nanoparticles commonly involves a series of methods and techniques. Such characterisation methods include phase, structural, morphology and size analysis. A combination of data from these evaluations provides the relationship between the synthesis parameters and the end properties of TiO 2 nanoparticles. Apart from the research findings on TiO 2 nanoparticles, the characterisation used to obtain these findings is equally important. Thus, this chapter highlights the recent characterisation techniques and practices employed for TiO 2 nanoparticles synthesised by the sol-gel method.

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Enhanced lithium ion storage in TiO2 nanoparticles, induced by sulphur and carbon co-doping

Cited by 27 publications

References 54 publications

Sputtering TiO2 on LiCoO2 composite electrodes as a simple and effective coating to enhance high-voltage cathode performance

Sputtering TiO2 on LiCoO2 composite electrodes as a simple and effective coating to enhance high-voltage cathode performance

Experimental and Theoretical Study of Electronic and Hyperfine Properties of Hydrogenated Anatase (TiO₂): Defect Interplay and Thermal Stability

Recent Characterisation of Sol-Gel Synthesised TiO2 Nanoparticles

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Enhanced lithium ion storage in TiO2 nanoparticles, induced by sulphur and carbon co-doping

Cited by 27 publications

References 54 publications

Sputtering TiO2 on LiCoO2 composite electrodes as a simple and effective coating to enhance high-voltage cathode performance

Sputtering TiO2 on LiCoO2 composite electrodes as a simple and effective coating to enhance high-voltage cathode performance

Experimental and Theoretical Study of Electronic and Hyperfine Properties of Hydrogenated Anatase (TiO2): Defect Interplay and Thermal Stability

Recent Characterisation of Sol-Gel Synthesised TiO2 Nanoparticles

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Experimental and Theoretical Study of Electronic and Hyperfine Properties of Hydrogenated Anatase (TiO₂): Defect Interplay and Thermal Stability