Papers by Claudio Capiglia
Journal of Power Sources, Apr 1, 2018
In the present study, Al 2 O 3 is utilized for the first time as coating agent on nanostructured ... more In the present study, Al 2 O 3 is utilized for the first time as coating agent on nanostructured anatase TiO 2 in order to investigate its effect on sodium-ion batteries performance. Our results show that the Al 2 O 3 coating, introduced by a facile two-step approach, provides beneficial effects to the TiO 2-based anodes. However, the coated TiO 2 still suffers of capacity fading upon cycling when using 1.0 M of NaClO 4 in propylene carbonate (PC) as electrolyte. To address this issue, the influence of different electrolytes (NaClO 4 salt in various solvents) is further studied. It is found that the modified TiO 2 exhibits significant improvements in cycling performance using binary ethylene carbonate (EC) and PC solvent mixture without the need of the commonly used fluoroethylene carbonate (FEC) additive. Under the best configuration, our battery could deliver a high reversible capacity of 188.1 mAh g −1 at 0.1C after 50 cycles, good rate capability up to 5C, and remarkable long-term cycling stability at 1C rate for 650 cycles. This excellent performance can be ascribed to the synergistic effects of surface and interface engineering enabling the formation of a stable and highly ionic conductive interface layer in EC:PC based electrolyte which combines the native SEI film and an 'artificial' SEI layer of irreversibly formed Na−Al−O.
Meeting abstracts, 2015
In the recent past nanostructured materials have been attracting much interest owing to their phy... more In the recent past nanostructured materials have been attracting much interest owing to their physical and chemical characteristics, which make them extremely suitable for a number of applications. In particular, one of the most promising applications is their use as electrode materials for rechargeable lithium ion batteries (LIB)1-2. Among the anode materials, Titanium dioxide (TiO2) has been deeply investigated for lithium intercalation/de-intercalation due to high rate capability, very good reversible capacity, low volume expansion ( <2% ) upon cycling and furthermore lost cost, high abundant and very safe lithium reaction potential ~ 1.5 V vs Li/Li+, owing to these characteristics, TiO2 anodes have been considered to target in EVs and HEVs application1-3. Recently, the various polymorphs of TiO2 (anatase, rutle, brookite and bronze) have been explored as efficient anodes for LIB3. In particular, TiO2-Bronze (TiO2-B) has been receiving significant interest due to its theoretical capacity of 335 mAh g-1. Importantly, TiO2-B manifests the major advantages of fast charging-discharging through a pseudo-capacitive mechanism in addition to the bulk diffusion, whereas other polymorphs of TiO2 mostly show intercalation of Li-ion through bulk diffusion controlled mechanism3. However, the low electronic conductivity and low rate of Li-ion diffusivity of TiO2 are key issues for a high rate capable anode. To overcome these issues, we report synthesis of carbon-doped TiO2-B nanowires by facile and inexpensive method without using external carbon source. The carbon doping was verified by UV–visible and X-ray photoelectron spectroscopy and further structure and morphology was investigated with X-ray diffraction, Raman spectroscopy and Scanning and Transmission microscopies. The electrochemical performances of the C doped and undoped TiO2-B nanowires were tested by galvanostatic charge/discharge cycling, cyclic voltammetry, and electrochemical impedance spectroscopy. This novel C-doped materials presented high capacities and higher rate capability in electrochemical cycling experiments with respective to undoped material. This is attributed to the reduction of Li-ion diffusion path lengths along with improving electrical conductivity of TiO2-B nanowires. The electrochemical experiments demonstrated that C-TiO2-B nanowires electrodes exhibited superior lithium storage capacity of ~306 mAh g-1 at current rate of 0.1C as well as excellent rate ability of ~160 mAh g-1even at high current rate of 10C after 1000 cycle in lithium-ion batteries. References: S.Goriparti, E. Miele, F. D. Angelis, E.D. Fabrizio, R. P. Zaccaria, C. Capiglia, J. Power Sources, 257 (2014) 421 G. Zhu, Y. G. Wang and Y. Y. Xia, Energy Environ. Sci., 5 (2012) 6652 A. G. Dylla, G. Henkelman and K. J. Stevenson, Acc. Chem. Res, 46 (2013) 1104 Figure 1
Meeting abstracts, 2016
Rechargeable lithium ion batteries have been in use in portable appliances like laptops, cameras ... more Rechargeable lithium ion batteries have been in use in portable appliances like laptops, cameras and cellular phones due to high gravimetric energy together with long cycle life [1-3]. However, the deployment of lithium ion batteries in applications like hybrid electric vehicles, plug in hybrid electric vehicles and smart grids needs improvements in terms of energy and power densities along with reducing the cost [1-2]. Nanostructured electrode active materials have attracted much attention because of their potential to provide higher energy and power densities than bulk materials. In Particularly anodes such as silicon, germanium, tin, metal oxides and carbonaceous are the most promising materials [2-3]. Germanium (Ge) nanocrystals with size of 5 nm and their composites of multiwalled carbon nanotubes (MWCNTs) were synthesized via solvothermal method. Ge and Ge@MWCNTs have been characterized through X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and Raman spectroscopy. Furthermore, electrochemical studies have been carried out with cyclic voltammetry, galvanostatic charging and discharging test, and impedance spectroscopy. The results show that as prepared Ge-MWCNTs nanocomposite exhibits improved cycling performance with higher capacity retention with respect to pure Ge electrode. In fact, Ge-MWCNTs nanocomposite shown a discharge capacity of 1160 mAh g-1 at current rate of 0.1C after 60 cycles as well as an excellent discharge capacity of 406 mAh g-1 at a current rate of 5C even after 400 cycles.References 1. J. B. Goodenough et. al., J. Am. Chem. Soc., 135 (2013) 1167 2. S.Goriparti et.al., J. Power Sources, 257 (2014) 421 3. S.Goriparti et.al., ACS Appl. Mater. Interfaces, 7, (2015) 25146 Figure 1
Electrochemical Storage Materials, 2018
ECS Meeting Abstracts, 2015
In the recent past nanostructured materials have been attracting much interest owing to their phy... more In the recent past nanostructured materials have been attracting much interest owing to their physical and chemical characteristics, which make them extremely suitable for a number of applications. In particular, one of the most promising applications is their use as electrode materials for rechargeable lithium ion batteries (LIB)1-2. Among the anode materials, Titanium dioxide (TiO2) has been deeply investigated for lithium intercalation/de-intercalation due to high rate capability, very good reversible capacity, low volume expansion ( <2% ) upon cycling and furthermore lost cost, high abundant and very safe lithium reaction potential ~ 1.5 V vs Li/Li+, owing to these characteristics, TiO2 anodes have been considered to target in EVs and HEVs application1-3. Recently, the various polymorphs of TiO2 (anatase, rutle, brookite and bronze) have been explored as efficient anodes for LIB3. In particular, TiO2-Bronze (TiO2-B) has been receiving significant interest due to its theoreti...
Journal of Power Sources, 2018
In the present study, Al 2 O 3 is utilized for the first time as coating agent on nanostructured ... more In the present study, Al 2 O 3 is utilized for the first time as coating agent on nanostructured anatase TiO 2 in order to investigate its effect on sodium-ion batteries performance. Our results show that the Al 2 O 3 coating, introduced by a facile two-step approach, provides beneficial effects to the TiO 2-based anodes. However, the coated TiO 2 still suffers of capacity fading upon cycling when using 1.0 M of NaClO 4 in propylene carbonate (PC) as electrolyte. To address this issue, the influence of different electrolytes (NaClO 4 salt in various solvents) is further studied. It is found that the modified TiO 2 exhibits significant improvements in cycling performance using binary ethylene carbonate (EC) and PC solvent mixture without the need of the commonly used fluoroethylene carbonate (FEC) additive. Under the best configuration, our battery could deliver a high reversible capacity of 188.1 mAh g −1 at 0.1C after 50 cycles, good rate capability up to 5C, and remarkable long-term cycling stability at 1C rate for 650 cycles. This excellent performance can be ascribed to the synergistic effects of surface and interface engineering enabling the formation of a stable and highly ionic conductive interface layer in EC:PC based electrolyte which combines the native SEI film and an 'artificial' SEI layer of irreversibly formed Na−Al−O.
Physical Sciences Reviews, 2018
Throughout the lithium ion battery (LIB) history, since they were mass produced by Sony in 1991, ... more Throughout the lithium ion battery (LIB) history, since they were mass produced by Sony in 1991, graphite-based materials have been the anode material of choice. There have been enormous efforts to search for ways of tapping higher energy with alternative anode materials to work in LIBs. Yet, those materials have always been subjected to detrimental mechanisms that hinder their applications in LIBs. Will nanotechnology and nanostructured anode materials change the energy storage technologies markedly in the future?
Solvent-free, composite electrolytes based on poly(ethylene oxide) (PEO) have been prepared by us... more Solvent-free, composite electrolytes based on poly(ethylene oxide) (PEO) have been prepared by using LiClO and 4 LiN(CF SO ) as the doping salts, and nanoscale SiO as the filler. The samples have been characterized for what concerns 32 2 2 their thermal and transport properties. The addition of the filler determines an increase of the conductivity of more than one
European Commission EC, Feb 19, 2021
Single-Walled Carbon Nanohorns (SWCNHs), are a kind of carbon material with graphene type surface... more Single-Walled Carbon Nanohorns (SWCNHs), are a kind of carbon material with graphene type surface structure characterized by horn shaped graphitic tubules (2-5 nm diameter and 40-50 nm tube length) to form dahlia-like structures. They can be mass produced (tons/year) using a novel proprietary process technology, making them attractive for various industrial applications. SWCNHs can be considered as the next generation of graphene-based materials. Thanks to their particular 3D structure, they do not stack as in the case of 2D graphene-based materials, and keep their original chemical-physical proprieties at the powder state. Inspired by their unique structure, Nitrogen doped Single-Walled Carbon Nanohorns (N-SWCNHs) were used as a conductive substrate with various post lithium ion batteries active materials such as Sulfur (cathode), Germanium, and Tin (anodes). The choice of nitrogen doping is motivated by the quest for improved interaction between SWCNHs and the surrounding active m...
Rechargeable Ion Batteries, Nov 18, 2022
Future Courses of Human Societies, 2018
Energy storage is the key enabling technology for exploitation of alternative energy and the vast... more Energy storage is the key enabling technology for exploitation of alternative energy and the vast deployment will help the transaction from a fossil fuel based economy to a more sustainable society. In the field of energy storage, lithium ion rechargeable batteries (LIB) play a significant role thanks to their high gravimetric and volumetric energy, long cycle's life, high efficiency and low self- discharge properties. The LIBs have proven to be the solution for portable devices like smart phones, tablets, personal computers, cameras, however for consistent application as a power source in electric vehicles they need from five to ten times more energy density than present state of the art technology can offer (150Wh/Kg) and higher power density. Furthermore, for the massive application of smart grid and stationary power projects, the production cost should be reduced and cycle life substantially increased. The path to LIB with improved energy density and reduced cost of manufact...
Physical Review B, 1999
Composite polymer electrolytes are of interest for solid-state electrochemical devices. In this p... more Composite polymer electrolytes are of interest for solid-state electrochemical devices. In this paper we use 7 Li solid-state NMR to investigate the cation dynamics of poly͑ethylene oxide͒-͑PEO-͒ based electrolytes, to which nanoscale ceramics has been added. The fillers give origin to nanocomposites. The NMR linewidth is dominated by Li-H magnetic dipolar interaction. The spin-lattice relaxation is chiefly controlled by electric quadrupolar interaction. The spin dynamics is sensibly influenced by the filler nanoparticles, which act as homogeneizing agents for the polymer. ͓S0163-1829͑99͒05333-3͔
Uploads
Papers by Claudio Capiglia