ORCID Profile
0000-0001-7499-3920
Current Organisation
Deakin University
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Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1CC05928A
Abstract: A cost-effective and scalable approach to produce highly stable Li composite anode from hemp textile waste with long cycling life.
Publisher: Wiley
Date: 02-03-2023
DOI: 10.1002/APP.53809
Abstract: Herein, we describe the use of single‐ion conducting block copolymer (SIC) as an additional lithium salt additive to a ternary solid polymer electrolyte (SPE), consisting of a poly(styrene‐ b ‐1‐((2‐acryloyloxy)ethyl)‐3‐butylimidazolium bis(trifluoromethanesulfo‐nyl)imide) (S‐ImTFSI 64‐16 ) block copolymer, a N ‐propyl‐ N ‐methylpyrrolidinium bis(fluorosulfonyl)imide (C 3 mpyrFSI) ionic liquid (IL) and a lithium bis(fluorosulfonyl) imide (LiFSI) salt. For this purpose, the S‐ImTFSI 64‐16 was substituted by a SIC, based on poly(styrene‐ b ‐((4‐styrenesulfonyl)(trifluoromethanesulfonyl)imide lithium salt)) (S‐STFSILi 64‐16 ), at various molar ratios. The impact of the SIC concentration on the phase behavior and transport properties of the SPEs was investigated by means of differential scanning calorimetry, electrochemical impedance spectroscopy, and diffusion NMR. In addition, the electrochemical performance of the SPEs was assessed in lithium symmetrical cell at 50 and 80°C. Finally, the cycling performance of a selected SPE was also assessed at 80°C in a Li│NMC 111 cell with capacity loading of 1.3 mAh.cm −2 at a C‐rate of 0.1 C. The Li│NMC 111 full cell was able to deliver a stable capacity of 0.94 mAh.cm −2 after 20 cycles, corresponding to a capacity of 117 mAh.g −1 . These results demonstrates that PIL block copolymer—IL—salt composites represent a promising choice of electrolyte for the next generation of solid‐state high energy density lithium metal batteries.
Publisher: Elsevier BV
Date: 12-2014
Publisher: Wiley
Date: 25-04-2022
Abstract: All‐solid‐state batteries (ASSBs) using organic ionic plastic crystals (OIPCs) are promising candidates to overcome the inherent safety issues of lithium‐ion batteries (LIBs). Although OIPCs have excellent process applicability in the roll‐to‐roll electrode fabrication process, their application as solid electrolytes incorporated in composite electrodes has yet to be demonstrated in detail. Herein, we denote the positive effect of the N ‐ethyl‐ N ‐methylpyrrolidinium bis(fluorosulfonyl)imide ([C 2 mpyr][FSI]) incorporated within a composite graphite anode on the charge rate capability and cycle life. The highest charge capacity ratio (the charge capacity at 2C vs. that measured at 0.1C) was measured for the composite anode with an OIPC composite ratio of 50 wt % (89.5 %, 295.7 mAh/g at 2C charge), almost the same as that of the graphite anode with a liquid electrolyte (85.7 %, 295.9 mAh/g at 2C charge). More favorable lithium‐ion conduction pathways were resolved for the anode with a higher OIPC composite ratio, whereas an excessive amount of OIPC reduced the long‐term cyclability. The most stable discharge capacity retention was obtained for 30 wt % OIPC composite (257.4 mAh/g at the 100th discharge), which showed no signs of discharge capacity fading within 100 cycles. The lithiation/delithiation process of the solid‐state graphite‐[C 2 mpyr][FSI] composite anode was evaluated to be stable and reversible. In addition, the incorporated OIPC composite enhanced the electrolyte/electrode and electrode/current collector contacts. This work highlights multiple advantageous functions of the OIPC in a composite graphite anode, which will broaden our horizons for the use of OIPC composites in ASSBs.
Publisher: IOP Publishing
Date: 10-06-2008
DOI: 10.1088/0957-4484/19/29/295304
Abstract: To date, nickel(II) oxide (NiO) is one of the few p-type semiconductors that has successfully been used for the construction of dye-sensitized photocathodes as well as tandem dye-sensitized solar cells. In this study we present a novel fabrication method for the preparation of mesoporous NiO films based on preformed NiO nanopowders. Critical properties such as pore-size distribution, crystallinity, and internal surface area of the resulting NiO films were controlled through the sintering process and optimized for their application as dye-sensitized photocathodes, resulting in a significantly increased photovoltaic performance, compared to earlier studies. A series of different sensitizers and electrolytes was scrutinized for their application in dye-sensitized NiO photocathodes. Despite its limited absorption range the dye coumarin 343 clearly outperforms other sensitizers used in this study. Values for short-circuit current densities of 2.13 mA cm(-2) and overall energy conversion efficiencies of 0.033% under simulated sunlight (AM1.5, 1000 W m(-2)) are the highest values reported in literature so far.
Publisher: Elsevier BV
Date: 12-2015
Publisher: Elsevier BV
Date: 02-2014
DOI: 10.1016/J.BIOS.2013.08.033
Abstract: Immobilisation of enzymes on a breathable electrode can be useful for various applications where the three-phase interface between gas or chemical vapour, electrolyte and electrode is crucial for the reaction. In this paper, we report the further development of the breathable electrode concept by immobilisation of alcohol dehydrogenase into vapour-phase polymerised poly(3,4-ethylene dioxythiophene) that has been coated onto a breathable membrane. Typical alcohol sensing, whereby the coenzyme β-Nicotinamide adenine dinucleotide (NADH) is employed as a redox-mediator, was successfully used as a model reaction for the oxidation of ethanol. This indicates that the ethanol vapour from the backside of the membrane has access to the active enzyme embedded in the electrode. The detecting range of the sensor is suitable for the detection of ethanol in fruit juices and for the baseline breath ethanol concentration of drunken driving. After continuous operation for 4.5h the system only showed a 20% decrease in the current output. The electrodes maintained 62% in current output after being refrigerated for 76 days. This work is continuing the progress of the immobilisation of specific enzymes for certain electrochemical reactions whereby the three-phase interface has to be maintained and/or the simultaneous separation of gas from liquid is required.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC01460D
Abstract: A lithium battery with excellent performance and thermal stability is realized by using a nanostructured electrode and an ionic liquid.
Publisher: American Chemical Society (ACS)
Date: 17-11-2022
Abstract: Silicon-containing Li-ion batteries have been the focus of many energy storage research efforts because of the promise of high energy density. Depending on the system, silicon generally demonstrates stable performance in half-cells, which is often attributed to the unlimited lithium supply from the lithium (Li) metal counter electrode. Here, the electrochemical performance of silicon with a high voltage NMC622 cathode was investigated in superconcentrated phosphonium-based ionic liquid (IL) electrolytes. As a matter of fact, there is very limited work and understanding of the full cell cycling of silicon in such a new class of electrolytes. The electrochemical behavior of silicon in the various IL electrolytes shows a gradual and steeper capacity decay, compared to what we previously reported in half-cells. This behavior is linked to a different evolution of the silicon morphology upon cycling, and the characterization of cycled electrodes points toward mechanical reasons, complete disconnection of part of the electrode, or internal mechanical stress, due to silicon and Li metal volume variation upon cycling, to explain the progressive capacity fading in full cell configuration. An extremely stable solid electrolyte interphase (SEI) in the full Li-ion cells can be seen from a combination of qualitative and quantitative information from transmission electron microscopy, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, and magic angle spinning nuclear magnetic resonance. Our findings provide a new perspective to full cell interpretation regarding capacity fading, which is oftentimes linked almost exclusively to the loss of Li inventory but also more broadly, and provide new insights into the impact of the evolution of silicon morphology on the electrochemical behavior.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA06344D
Abstract: We explore a superconcentrated electrolyte comprising N -propyl- N -methylpyrrolidinium bis(fluorosulfonyl)imide, 1,2 dimethoxyethane and 3.2 mol kg −1 LiFSI. It offers an alternative ion-transport mechanism, improved fluidity and ultra-stable Li metal battery performance.
Publisher: The Electrochemical Society
Date: 18-08-2014
Abstract: This communication will provide details on some of the high temperature polymer electrolyte membrane (HT-PEM) membrane-electrode-assembly (MEA) performance targets most recently achieved by Danish Power Systems. These include (i) MEA performances of .67 V at 0.2 A cm -2 using dry H 2 /Air, (ii) MEA lifetime of 12000 h at 0.23 A cm -2 using dry H 2 /Air with an average degradation rate of 9 µV h -1 , and (iii) an integrated 5 kW stack/reformer system using methanol reformate as fuel. Studies using reformate have also led to promising results with an MEA performance of 0.58 V at 0.4 A cm -2 with a degradation rate of 24 µV h -1 using wet H 2 (30 mol%)/Air for 500 hours. In addition to reaching these performance benchmarks, a reduction in the standard deviation for MEA performance to % has been achieved through efforts aimed at improving the uniformity of the membrane and catalyst layer thicknesses.
Publisher: American Chemical Society (ACS)
Date: 13-10-2017
Publisher: American Chemical Society (ACS)
Date: 16-06-2021
Publisher: Wiley
Date: 21-01-2020
Abstract: With increasing demands for safe, high capacity energy storage to support personal electronics, newer devices such as unmanned aerial vehicles, as well as the commercialization of electric vehicles, current energy storage technologies are facing increased challenges. Although alternative batteries have been intensively investigated, lithium (Li) batteries are still recognized as the preferred energy storage solution for the consumer electronics markets and next generation automobiles. However, the commercialized Li batteries still have disadvantages, such as low capacities, potential safety issues, and unfavorable cycling life. Therefore, the design and development of electromaterials toward high-energy-density, long-life-span Li batteries with improved safety is a focus for researchers in the field of energy materials. Herein, recent advances in the development of novel organic electrolytes are summarized toward solid-state Li batteries with higher energy density and improved safety. On the basis of new insights into ionic conduction and design principles of organic-based solid-state electrolytes, specific strategies toward developing these electrolytes for Li metal anodes, high-energy-density cathode materials (e.g., high voltage materials), as well as the optimization of cathode formulations are outlined. Finally, prospects for next generation solid-state electrolytes are also proposed.
Publisher: American Chemical Society (ACS)
Date: 21-07-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1SE00724F
Abstract: Anode-free lithium metal batteries based on ionic liquid electrolytes offer an excellent pathway to significantly boost the energy density and specific energy over current lithium-ion technology by eliminating the anode material during cell assembly.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM34214F
Publisher: American Chemical Society (ACS)
Date: 11-03-2022
Abstract: Employing high-voltage Ni-rich cathodes in Li metal batteries (LMBs) requires stabilization of the electrode/electrolyte interfaces at both electrodes. A stable solid-electrolyte interphase (SEI) and suppression of active material pulverization remain the greatest challenges to achieving efficient long-term cycling. Herein, studies of NMC622 (1 mAh cm
Publisher: Elsevier BV
Date: 2015
Publisher: Royal Society of Chemistry (RSC)
Date: 24-10-2014
DOI: 10.1039/C4RA10200B
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8SE00159F
Abstract: Cycling stability at high capacities and water-tolerance are two key properties for the operation of high-capacity lithium (Li) metal–air batteries.
Publisher: AIP Publishing
Date: 30-01-2018
DOI: 10.1063/1.5016460
Abstract: Ionic liquid electrolytes with high alkali salt concentrations have displayed some excellent electrochemical properties, thus opening up the field for further improvements to liquid electrolytes for lithium or sodium batteries. Fundamental computational investigations into these high concentration systems are required in order to gain a better understanding of these systems, yet they remain lacking. Small phosphonium-based ionic liquids with high concentrations of alkali metal ions have recently shown many promising results in experimental studies, thereby prompting us to conduct further theoretical exploration of these materials. Here, we conducted a molecular dynamics simulation on four small phosphonium-based ionic liquids with 50 mol. % LiFSI salt, focusing on the effect of cation structure on local structuring and ion diffusional and rotational dynamics—which are closely related to the electrochemical properties of these materials.
Publisher: Wiley
Date: 15-06-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA03502E
Abstract: Organic salts are being considered for the electrolyte solvent in rechargeable lithium-metal batteries (LMBs).
Publisher: American Chemical Society (ACS)
Date: 27-11-2019
Publisher: American Chemical Society (ACS)
Date: 02-04-2020
Publisher: Elsevier BV
Date: 02-2015
Publisher: American Chemical Society (ACS)
Date: 11-06-2021
Publisher: The Electrochemical Society
Date: 09-01-2013
DOI: 10.1149/2.010303EEL
Publisher: American Chemical Society (ACS)
Date: 03-02-2020
Publisher: American Chemical Society (ACS)
Date: 02-07-2021
Publisher: American Chemical Society (ACS)
Date: 26-08-2019
Publisher: American Chemical Society (ACS)
Date: 11-08-2020
No related grants have been discovered for Robert Kerr.