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Limited By:	Author = Clancy, Tomás M.;

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Displaying Results 1 - 6 of 6 on page 1 of 1

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Core-shell nanoarchitectures for lithium-ion energy storage applications (2016)

Clancy, Tomás M.; Rohan, James F.

Core-shell nanoarchitectures for lithium-ion energy storage applications (2016)

Clancy, Tomás M.; Rohan, James F.

Abstract:

Multiphysics simulations (COMSOL) of core-shell nanoarchitectures show that they can operate at 3 times the C-rate of micron scale thin film materials while still accessing 90% of an additive free cathode oxide material. A high performance Ge anode DC sputtered onto a Cu nanotube current collector is characterised. Volume expansion of Ge is alleviated and mechanical stability is enhanced due to the Cu nanotubes current collector.

http://hdl.handle.net/10468/6490

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Energy storage: battery materials and architectures at the nanoscale (2014)

Rohan, James F.; Hasan, Maksudul; Patil, Sanjay; Casey, Declan P.; Clancy, Tomás M.

Energy storage: battery materials and architectures at the nanoscale (2014)

Rohan, James F.; Hasan, Maksudul; Patil, Sanjay; Casey, Declan P.; Clancy, Tomás M.

http://hdl.handle.net/10468/1650

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Multiphysics simulations of nanoarchitectures and analysis of germanium core-shell anode nanostructure for lithium-ion energy storage applications (2015)

Clancy, Tomás M.; Rohan, James F.

Multiphysics simulations of nanoarchitectures and analysis of germanium core-shell anode nanostructure for lithium-ion energy storage applications (2015)

Clancy, Tomás M.; Rohan, James F.

Abstract:

This paper reports multiphysics simulations (COMSOL) of relatively low conductive cathode oxide materials in nanoarchitectures that operate within the appropriate potential range (cut-off voltage 2.5 V) at 3 times the C-rate of micron scale thin film materials while still accessing 90% of material. This paper also reports a novel anode fabrication of Ge sputtered on a Cu nanotube current collector for lithium-ion batteries. Ge on Cu nanotubes is shown to alleviate the effect of volume expansion, enhancing mechanical stability at the nanoscale and improved the electronic characteristics for increased rate capabilities.

http://hdl.handle.net/10468/7590

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Simulations of 3D nanoscale architectures and electrolyte characteristics for Li-ion microbatteries (2019)

Clancy, Tomás M.; Rohan, James F.

Simulations of 3D nanoscale architectures and electrolyte characteristics for Li-ion microbatteries (2019)

Clancy, Tomás M.; Rohan, James F.

Abstract:

Finite element simulations are presented, showing material utilisation and electrochemical cell behaviour of a rechargeable Li-ion microbattery in planar thin-film, 3D and 3D core core-shell nanoarchitectures in which the active material is 250 nm thick as a shell on a 250 nm diameter core support. The materials simulated are non-porous additive-free LiCoO2, lithium metal and solid-state, polymer, polymer-gel and liquid electrolytes. The concentration profile of the LiCoO2 during discharge and areal energy versus areal power in a Ragone plot for each of the different architectures are compared. It is shown that the planar thin-film architecture gave better cell performance when used with the solid-state electrolyte with all three architectures showing material utilisation of the cathode at the closest point to the anode. The 3D and 3D core-shell nanoarchitectures show better battery performance for the polymer electrolyte then the planar thin film, with the 3D nanoarchitecture being...

http://hdl.handle.net/10468/7587

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Sn-based micro and nano lithium battery materials (2014)

Clancy, Tomás M.; Hasan, Maksudul; Rohan, James F.

Sn-based micro and nano lithium battery materials (2014)

Clancy, Tomás M.; Hasan, Maksudul; Rohan, James F.

Abstract:

Energy provision and storage are significant and critical issues for wireless sensor network (WSN) applications. Hybrid energy devices incorporating energy harvesting and storage requires the development of enhanced energy storage materials and architectures. A decreased footprint with the same energy capability is desirable to maximise the energy density and enable long-life wireless sensors. Methods to structure active and support battery materials enhance the device characteristics offering mechanical and electrical support. The results below are for materials that can be processed in 3D or 1D to decrease the footprint of the energy storage element. The effect of the support material is also shown to be significant and directly relevant for high aspect ratio nanostructure where the lithium active materials experience volume changes during charge and discharge.

http://hdl.handle.net/10468/7595

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Ultra-fast cycling of nanoscale thin-film LiCoO2 electrodes in aqueous electrolytes (2018)

Clancy, Tomás M.; Rohan, James F.

Ultra-fast cycling of nanoscale thin-film LiCoO2 electrodes in aqueous electrolytes (2018)

Clancy, Tomás M.; Rohan, James F.

Abstract:

Additive‐free nanoscale LiCoO2 thin‐films deposited on Si substrates using DC sputtering show exceptional electrochemical performance due to the unique kinetics of the nanoscale thin‐film in aqueous environment. At extremely high scan rates and galvanostatic current densities of up to 100 mV s−1 and 200 C respectively, a capacity retention equivalent to 97 mAh g−1 (4.8 μAh cm−2, 48.3 μAh cm−2 μm−1) is obtained. A significant contribution of non‐diffusion controlled kinetics in a LiCoO2 electrode is shown.

http://hdl.handle.net/10468/6863

Displaying Results 1 - 6 of 6 on page 1 of 1