ORCID Profile
0000-0001-7713-7062
Current Organisation
Deakin University
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Publisher: Wiley
Date: 21-07-2017
Abstract: Organic ionic plastic crystals (OIPCs) are a class of solid-state electrolytes with good thermal stability, non-flammability, non-volatility, and good electrochemical stability. When prepared in a composite with electrospun polyvinylidene fluoride (PVdF) nanofibers, a 1:1 mixture of the OIPC N-ethyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide ([C
Publisher: American Chemical Society (ACS)
Date: 06-06-2018
Publisher: American Chemical Society (ACS)
Date: 11-08-2022
Publisher: Elsevier BV
Date: 04-2007
Publisher: Wiley
Date: 18-01-2019
Publisher: American Chemical Society (ACS)
Date: 11-01-2021
Publisher: MDPI AG
Date: 26-11-2021
Abstract: Polymer electrolytes continue to offer the opportunity for safer, high-performing next-generation battery technology. The benefits of a polymeric electrolyte system lie in its ease of processing and flexibility, while ion transport and mechanical strength have been highlighted for improvement. This report discusses how factors, specifically the chemistry and structure of the polymers, have driven the progression of these materials from the early days of PEO. The introduction of ionic polymers has led to advances in ionic conductivity while the use of block copolymers has also increased the mechanical properties and provided more flexibility in solid polymer electrolyte development. The combination of these two, ionic block copolymer materials, are still in their early stages but offer exciting possibilities for the future of this field.
Publisher: American Chemical Society (ACS)
Date: 22-02-2022
Publisher: American Chemical Society (ACS)
Date: 28-06-2018
DOI: 10.1021/ACS.JPCLETT.8B01500
Abstract: A fundamental understanding of the structure and dynamics of organic ionic plastic crystal (OIPC) materials allows for a more rational design of molecular chemistry toward improved mechanical and electrochemical performances. This Letter investigates the solid-state structure and ion dynamics of two imidazolium-based protic organic ionic plastic crystals as well as the ion-transport properties in both compounds. A combination of DSC, conductivity, NMR, and synchrotron X-ray studies revealed that a subtle change in cation chemistry results in substantial differences in the thermal phase behavior, crystalline structures, as well as the ion conduction mechanisms in the protic plastic crystal compounds. Whereas most of the research nowadays has been focused on the optimization of chemistry of cations and anions, this work highlights the importance of microstructures on the ion transport rate and pathways of the OIPC materials.
Publisher: Elsevier BV
Date: 02-2020
Publisher: The Electrochemical Society
Date: 2006
DOI: 10.1149/1.2234730
Publisher: Elsevier BV
Date: 09-2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA02817A
Abstract: Organic ionic plastic crystal (OIPC) modified poly(vinylidene difluoride) (PVDF) composite fiber membrane with enhanced ion dynamics and almost pure β-PVDF are demonstrated.
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: Wiley
Date: 05-02-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6TA10340E
Abstract: Phase behaviour of a new class of solid state electrolyte with different concentration of Na salt is illustrated for the first time.
Publisher: Springer Science and Business Media LLC
Date: 04-07-2022
DOI: 10.1038/S41563-022-01296-0
Abstract: Rechargeable batteries paired with sodium metal anodes are considered to be one of the most promising high-energy and low-cost energy-storage systems. However, the use of highly reactive sodium metal and the formation of sodium dendrites during battery operation have caused safety concerns, especially when highly flammable liquid electrolytes are used. Here we design and develop solvent-free solid polymer electrolytes (SPEs) based on a perfluoropolyether-terminated polyethylene oxide (PEO)-based block copolymer for safe and stable all-solid-state sodium metal batteries. Compared with traditional PEO SPEs, our results suggest that block copolymer design allows for the formation of self-assembled nanostructures leading to high storage modulus at elevated temperatures with the PEO domains providing transport channels even at high salt concentration (ethylene oxide/sodium = 8/2). Moreover, it is demonstrated that the incorporation of perfluoropolyether segments enhances the Na
Publisher: American Chemical Society (ACS)
Date: 20-07-2020
Publisher: Research Square Platform LLC
Date: 25-05-2021
DOI: 10.21203/RS.3.RS-532893/V1
Abstract: Polymer electrolytes provide a safe solution for all-solid-state high energy density batteries. Materials that meet the simultaneous requirement of high ionic conductivity and high transference number remain a challenge, in particular for new battery chemistries beyond Lithium such as Na, K and Mg. Herein, we demonstrate the versatility of a polymeric ionic liquid (PolyIL) as a solid-state solvent to achieve this goal for both Na and K. Using molecular simulations, we predict and elucidate fast metal ion transport in PolyILs through a structural diffusion mechanism in a polymer-in-salt environment, facilitating a high transference number. Experimental validation of these computational designed Na and K polymer electrolytes gives high ionic conductivities of 1.010 -3 S cm-1 at 80 o C and an exceptional Na + transference number of ~0.57. Electrochemical cycling of a sodium anode also demonstrates an ultra-low overpotential of 40 mV and stable long term performance of more than 100 hours in a symmetric cell. PolyIL-based polymer-in-salt strategies for novel solid-state electrolytes thus offer a promising route to design high performance next generation sustainable battery chemistries.
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: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 12-2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA12827A
Abstract: The interactions between OIPCs and polymer nanoparticles create interfacial layers that control the ion mobility of the resulting composite.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA08233A
Abstract: Poly(ionic liquids)-based gel polymer electrolytes containing high lithium salt concentration ionic liquids are demonstrated.
Publisher: American Chemical Society (ACS)
Date: 25-02-2019
DOI: 10.1021/ACS.ACCOUNTS.8B00566
Abstract: Electrolytes based on organic solvents used in current Li-ion batteries are not compatible with the next-generation energy storage technologies including those based on Li metal. Thus, there has been an increase in research activities investigating solid-state electrolytes, ionic liquids (ILs), polymers, and combinations of these. This Account will discuss some of the work from our teams in these areas. Similarly, other metal-based technologies including Na, Mg, Zn, and Al, for ex le, are being considered as alternatives to Li-based energy storage. However, the materials research required to effectively enable these alkali metal based energy storage applications is still in its relative infancy. Once again, electrolytes play a significant role in enabling these devices, and research has for the most part progressed along similar lines to that in advanced lithium technologies. Some of our recent contributions in these areas will also be discussed, along with our perspective on future directions in this field. For ex le, one approach has been to develop single-ion conductors, where the anion is tethered to the polymer backbone, and the dominant charge conductor is the lithium or sodium countercation. Typically, these present with low conductivity, whereas by using a copolymer approach or incorporating bulky quaternary ammonium co-cations, the effective charge separation is increased thus leading to higher conductivities and greater mobility of the alkali metal cation. This has been demonstrated both experimentally and via computer simulations. Further enhancements in ion transport may be possible in the future by designing and tethering more weakly associating anions to the polymer backbone. The second approach considers ion gels or composite polymer electrolytes where a polymerized ionic liquid is the matrix that provides both mechanical robustness and ion conducting pathways. The block copolymer approach is also demonstrated, in this case, to simultaneously provide mechanical properties and high ionic conductivity when used in combination with ionic-liquid electrolytes. The ultimate electrolyte material that will enable all high-performance solid-state batteries will have ion transport decoupled from the mechanical properties. While inorganic conductors can achieve this, their rigid, brittle nature creates difficulties. On the other hand, ionic polymers and their composites provide a rich area of chemistry to design and tune high ionic conductivity together with ideal mechanical properties.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 11-2017
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 11-2018
Publisher: MDPI AG
Date: 31-08-2020
Abstract: Mixed ionic-electronic conductors, such as poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) are postulated to be the next generation materials in energy storage and electronic devices. Although many studies have aimed to enhance the electronic conductivity and mechanical properties of these materials, there has been little focus on ionic conductivity. In this work, blends based on PEDOT stabilized by the polyelectrolyte poly(diallyldimethylammonium) (PolyDADMA X) are reported, where the X anion is either chloride (Cl), bis(fluorosulfonyl)imide (FSI), bis(trifluoromethylsulfonyl)imide (TFSI), triflate (CF3SO3) or tosylate (Tos). Electronic conductivity values of 0.6 S cm−1 were achieved in films of PEDOT:PolyDADMA FSI (without any post-treatment), with an ionic conductivity of 5 × 10−6 S cm−1 at 70 °C. Organic ionic plastic crystals (OIPCs) based on the cation N-ethyl-N-methylpyrrolidinium (C2mpyr+) with similar anions were added to synergistically enhance both electronic and ionic conductivities. PEDOT:PolyDADMA X / [C2mpyr][X] composites (80/20 wt%) resulted in higher ionic conductivity values (e.g., 2 × 10−5 S cm−1 at 70 °C for PEDOT:PolyDADMA FSI/[C2mpyr][FSI]) and improved electrochemical performance versus the neat PEDOT:PolyDADMA X with no OIPC. Herein, new materials are presented and discussed including new PEDOT:PolyDADMA and organic ionic plastic crystal blends highlighting their promising properties for energy storage applications.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0MA00992J
Abstract: Ion dynamics enhancements derived from anion–polymer interactions are proposed in organic ionic plastic crystal–poly(vinylidene fluoride)composite electrolytes.
Publisher: American Chemical Society (ACS)
Date: 21-11-2022
Publisher: Research Square Platform LLC
Date: 02-04-2021
DOI: 10.21203/RS.3.RS-354912/V2
Abstract: Rechargeable batteries paired with sodium (Na)-metal anodes are considered as one of the most promising high energy and low-cost energy storage systems. However, the use of highly reactive Na metal and the formation of Na dendrites during battery operation have caused significant safety concerns, especially when highly flammable liquid electrolytes are used. Herein, we design and develop a solvent-free solid polymer electrolytes (SPEs) based on a perfluoropolyether (PFPE) terminated polyethylene glycol (PEG)-based block copolymer for safe and stable all-solid-state Na-metal batteries. Compared with traditional poly(ethylene oxide) (PEO) or PEG SPEs, our results suggest that block copolymer design allows for the formation of self-assembled microstructures leading to high storage modulus at elevated temperatures with the PEG domains providing transport channels even at high salt concentration (EO/Na + = 8:2). Moreover, it is demonstrated that the incorporation of PFPE segments enhances the Na + transference number of the electrolyte to 0.46 at 80 o C. Finally, the proposed SPE exhibits highly stable symmetric cell cycling performance with high current density (0.5 mA cm -2 and 1.0 mAh cm -2 , up to 1300 hours). The assembled all-solid-state Na-metal batteries with Na 3 V 2 (PO 4 ) 3 cathode demonstrate outstanding rate performance, high capacity retention and long-term charge/discharge stability (CE = 99.91%) after more than 900 cycles.
Publisher: Springer Science and Business Media LLC
Date: 28-07-2022
DOI: 10.1038/S41563-022-01319-W
Abstract: Polymer electrolytes provide a safe solution for future solid-state high-energy-density batteries. Materials that meet the simultaneous requirement of high ionic conductivity and high transference number remain a challenge, in particular for new battery chemistries beyond lithium such as Na, K and Mg. Herein, we demonstrate the versatility of a polymeric ionic liquid (PolyIL) as a polymer solvent to achieve this goal for both Na and K. Using molecular simulations, we predict and elucidate fast alkali metal ion transport in PolyILs through a structural diffusion mechanism in a polymer-in-salt environment, facilitating a high metal ion transference number simultaneously. Experimental validation of these computationally designed Na and K polymer electrolytes shows good ionic conductivities up to 1.0 × 10
Publisher: IOP Publishing
Date: 21-06-2021
Abstract: The development of highly conductive and safe electrolytes for sodium-ion batteries is an emerging field beyond lithium battery technologies. In this work we have developed new ionogel electrolytes consisting of a binary mixture of an organic ionic plastic crystal, N -ethyl- N -methylpyrrolidiniumbis(fluorosulfonyl)imide (C 2 mpyrFSI), mixed with NaFSI supported on a mat of electrospun poly (vinylidene fluoride) nanofibers. The salt mixture near the eutectic composition (35 mol% NaFSI) was selected for further study after a detailed phase diagram analysis and ionogel electrolytes based on this were prepared. The ionic conductivity of the prepared ionogel composite reaches 2.6 × 10 −3 S cm −1 at ambient temperature. This ionogel membrane possessed a relatively high Na-ion transference number of 0.44 at 50 °C and we demonstrate the performance of a Na metal full cell using a NaFePO 4 cathode (1.75–4.0 V). The assembled cells show a good capacity retention with coulombic efficiency close to 100% at various C rates between C/20, C/10 and C/5, achieving 120 mAh g −1 at C/20. The long term charge/discharge performance is also demonstrated. Our study provides a feasible method to prepare highly conductive ionogel electrolytes for future Na-battery applications
Publisher: Springer Science and Business Media LLC
Date: 30-07-2020
Publisher: Elsevier BV
Date: 10-2015
Publisher: American Chemical Society (ACS)
Date: 02-03-2017
DOI: 10.1021/ACS.LANGMUIR.6B03992
Abstract: Lubricin (LUB) is a "mucin-like" glycoprotein found in synovial fluids and coating the cartilage surfaces of articular joints, which is now generally accepted as one of the body's primary boundary lubricants and antiadhesive agents. LUB's superior lubrication and antiadhesion are believed to derive from its unique interfacial properties by which LUB molecules adhere to surfaces (and biomolecules, such as hyaluronic acid and collagen) through discrete interactions localized to its two terminal end domains. These regionally specific interactions lead to self-assembly behavior and the formation of a well-ordered "telechelic" polymer brush structure on most substrates. Despite its importance to biological lubrication, detailed knowledge on the LUB's self-assembled brush structure is insufficient and derived mostly from indirect and circumstantial evidence. Neutron reflectometry (NR) was used to directly probe the self-assembled LUB layers, confirming the polymer brush architecture and resolving the degree of hydration and level of surface coverage. While attempting to improve the LUB contrast in the NR measurements, the LUB layers were exposed to a 20 mM solution of CaCl
Publisher: Elsevier BV
Date: 11-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA04407C
Abstract: Three dual-cation polymeric ionomers that contain tetraalkylammonium ions and sodium ions have been synthesized and exhibited higher conductivity than the analogous single sodium ion polymers.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6CP07415D
Abstract: LiFSI doped [C 2 mpyr][FSI]–PVdF composites were developed as solid-state, self-standing electrolyte membranes.
Publisher: Springer Science and Business Media LLC
Date: 03-05-2021
Publisher: Elsevier BV
Date: 2014
Publisher: American Chemical Society (ACS)
Date: 06-06-2018
Publisher: Wiley
Date: 04-05-2017
Publisher: Wiley
Date: 03-08-2011
DOI: 10.1002/POLB.22326
Publisher: American Chemical Society (ACS)
Date: 12-07-2019
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 03-2014
No related grants have been discovered for Xiaoen Wang.