Capacitive contribution to Li-storage in TiO2 (B) and TiO2 (anatase)

Laskova, Barbora; Zukalová, Markéta; Zukal, Arnošt; Bouša, Milan; Kavan, Ladislav

doi:10.1016/j.jpowsour.2013.07.073

Cited by 88 publications

(46 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calculated capacitive contributions show a decreased trend at higher annealing temperature, which is according with the discharge/charge curves in Figure 4 b. As mentioned by Kavan, [ 45 ] in these biphase samples, it is challenging to accurately identify charges to each individual phase due to overlapping voltammetric peaks of anatase and TiO 2 -B. We advise that this fi tting is not reliable in this particular study, as the percentage of TiO 2 -B phase in all samples is very small (14.96% in AB450, 2.72% in AB550 and 1.25% in AB650), so that the voltammetric peaks of TiO 2 -B are diffi cult to be distinguished.…”

Section: And Eis Analysissupporting

confidence: 83%

Ultrathin Anatase TiO₂ Nanosheets Embedded with TiO₂‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries

Yang

et al. 2014

Advanced Energy Materials

213

214

View full text Add to dashboard Cite

A new form of TiO2 microspheres comprised of anatase/TiO2‐B ultrathin composite nanosheets has been synthesized successfully and used as Li‐ion storage electrode material. By comparison between samples obtained with different annealing temperatures, it is demonstrated that the anatase/TiO2‐B coherent interfaces may contribute additional lithium storage venues due to a favorable charge separation at the boundary between the two phases. The as‐prepared hierarchical nanostructures show capacities of 180 and 110 mAh g−1 after 1000 cycles at current densities of 3400 and 8500 mA g−1. The ultrathin nanosheet structure which provides short lithium diffusion length and high electrode/electrolyte contact area also accounts for the high capacity and long‐cycle stability.

show abstract

Section: And Eis Analysissupporting

confidence: 83%

Ultrathin Anatase TiO₂ Nanosheets Embedded with TiO₂‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries

Yang

et al. 2014

Advanced Energy Materials

213

214

View full text Add to dashboard Cite

show abstract

“…Considering the significantly higher surface area of the nanotubes, this may be associated to pseudo-capacitive effects. 30,82,[91][92][93][94] Comparing now the development of the potential profiles at elevated C rates reveals two additional interesting features. First, nanotubes show a reduced ohmic drop at elevated rates.…”

Section: Resultsmentioning

confidence: 95%

Carbon-Coated Anatase TiO₂Nanotubes for Li- and Na-Ion Anodes

Bresser

Oschmann

Tahir

et al. 2014

J. Electrochem. Soc.

View full text Add to dashboard Cite

Carbon-coated, anatase titanium dioxide nanotubes were prepared by carbonizing a polyacrylonitrile-based block copolymer grafted on the as-synthesized titanate nanotubes. As revealed by high resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS), this approach results in a very homogeneous and thin carbon coating, which is advantageous for those active materials storing lithium without undergoing significant volume changes upon ion (de-)insertion. As a matter of fact, thus prepared carbon-coated TiO 2 nanotubes presented an excellent long-term cycling stability for more than 500 cycles (0.02% capacity fading per cycle) and a very promising high rate performance (about 130 and 110 mAh g −1 at 10 C and 15 C, respectively). The influence of the tubular morphology on the rate performance is briefly discussed by comparing carbon-coated nanotubes and nanorods. Finally, the carbon-coated nanotubes were also investigated as sodium-ion anode material, showing very promising reversible capacities of around 170, 120, and 100 mAh g −1 at C/10, 1 C, and 2 C, respectively, rendering them as versatile anode material for lithium-and sodium-ion applications © The Author Efficient energy storage, prospected to pave the way for a fully electrified transportation system and the complete energy supply by renewables, is probably one of the major challenges modern society faces.1-3 Lithium-ion batteries and, very recently, sodium-ion batteries are considered as two of the most promising energy storage technologies to achieve these highly desired targets. However, further improvements in terms of energy density, rate capability, and safety are needed to make these devices finally suitable for such large-scale applications.4-14 With respect to stationary energy storage applications, for which weight and volume of the battery are not a real issue while long-term cycling stability, rate performance, and safety are of major importance, in particular, titanium-based materials are considered as highly promising candidates to replace the state-of-theart lithium-ion anode material graphite.15-18 Among these, anatase TiO 2 is certainly of special interest due to its natural abundance, low cost, environmental friendliness, non-toxicity, and large-scale availability.19-21 Additionally, it offers a rather large theoretical specific capacity of 335 mAh g −1 , corresponding to the reversible uptake and release of one lithium or sodium per formula unit of TiO 2 . The practical limit for micro-sized particles, however, is 0.5 lithium per TiO 2 unit (corresponding to a specific capacity of about 168 mAh g −1 ), due to diffusion limitation in the solid phase.22-25 Substantial improvements were realized in recent years by nanostructuring the primary particles [26][27][28][29][30] and the application of carbonaceous coatings 31-42 and matrices, [43][44][45] resulting commonly in enhanced rate capabilities, cycling stability, and increased specific capacities.46-48 One-dimensional nanostructures, such as nanowires,...

show abstract

“…This is a consequence of a second phase transition between Li 0.5 TiO 2 and Li 1 TiO 2 only occurring at the surface of the crystallites (Wagemaker et al, 2007). For the amorphous samples prepared in different media and at different temperatures, a sloping voltage curve with no plateau is observed unlike what has been reported previously (Borghols et al, 2010) indicating a solid-solution or capacitive (Laskova et al, 2014) lithium insertion mechanism and the absence of a contributing crystalline anatase fraction (Wagemaker and Mulder, 2013). This is further corroborated by the HRTEM micrographs of the samples described in the preceding section by the absence of significant fringes.…”

Section: Figure 4 | (Ac)mentioning

confidence: 58%

“…Figure 3B only samples ana-TiO 2 -C and ana-TiO 2 -D, which were also additionally heated under vacuum show any substantial capacity retention at just under 200 mAh/g and just over 100 mAh/g, respectively, after 50 battery cycles. The main difference between samples ana-TiO 2 -C and -D is the presence of the amorphous fraction, which arises due to the annealing conditions adopted during the preparation of sample ana-TiO 2 -C. Lithium storage in the anaTiO 2 -C sample probably occurs via a combination of an insertion and capacitive mechanism occurring due to the presence of the high-surface amorphous component, leading to a higher overall capacity (Laskova et al, 2014). In the more crystalline ana-TiO 2 -D sample, the capacity is consistent what has been found for nano crystalline anatase particles (Sudant et al, 2005) in which case the storage takes place via lithium insertion.…”

Section: Figure 4 | (Ac)mentioning

confidence: 99%

Improving Reversible Capacities of High-Surface Lithium Insertion Materials â€“ The Case of Amorphous TiO2

et al. 2014

View full text Add to dashboard Cite

Chemisorbed water and solvent molecules and their reactivity with components from the electrolyte in high-surface nano-structured electrodes remains a contributing factor toward capacity diminishment on cycling in lithium ion batteries due to the limit in maximum annealing temperature. Here, we report a marked improvement in the capacity retention of amorphous TiO 2 by the choice of preparation solvent, control of annealing temperature, and the presence of surface functional groups. Careful heating of the amorphousTiO 2 sample prepared in acetone under vacuum lead to complete removal of all molecular solvent and an improved capacity retention of 220 mAh/g over 50 cycles at a C/10 rate. Amorphous TiO 2 when prepared in ethanol and heated under vacuum showed an even better capacity retention of 240 mAh/g. From Fourier transform infra-red spectroscopy and electron energy loss spectroscopy measurements, the improved capacity is attributed to the complete removal of ethanol and the presence of very small fractions of residual functional groups coordinated to oxygen-deficient surface titanium sites. These displace the more reactive chemisorbed hydroxyl groups, limiting reaction with components from the electrolyte and possibly enhancing the integrity of the solid electrolyte interface. The present research provides a facile strategy to improve the capacity retention of nano-structured electrode materials.

show abstract

Capacitive contribution to Li-storage in TiO2 (B) and TiO2 (anatase)

Cited by 88 publications

References 51 publications

Ultrathin Anatase TiO₂ Nanosheets Embedded with TiO₂‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries

Ultrathin Anatase TiO₂ Nanosheets Embedded with TiO₂‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries

Carbon-Coated Anatase TiO₂Nanotubes for Li- and Na-Ion Anodes

Improving Reversible Capacities of High-Surface Lithium Insertion Materials â€“ The Case of Amorphous TiO2

Contact Info

Product

Resources

About

Capacitive contribution to Li-storage in TiO2 (B) and TiO2 (anatase)

Cited by 88 publications

References 51 publications

Ultrathin Anatase TiO2 Nanosheets Embedded with TiO2‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries

Ultrathin Anatase TiO2 Nanosheets Embedded with TiO2‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries

Carbon-Coated Anatase TiO2Nanotubes for Li- and Na-Ion Anodes

Improving Reversible Capacities of High-Surface Lithium Insertion Materials â€“ The Case of Amorphous TiO2

Contact Info

Product

Resources

About

Ultrathin Anatase TiO₂ Nanosheets Embedded with TiO₂‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries

Ultrathin Anatase TiO₂ Nanosheets Embedded with TiO₂‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries

Carbon-Coated Anatase TiO₂Nanotubes for Li- and Na-Ion Anodes