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Hanxi Yang - One of the best experts on this subject based on the ideXlab platform.

  • prussian blue cathode materials for sodium ion batteries and other ion batteries
    Advanced Energy Materials, 2018
    Co-Authors: Jiangfeng Qian, Yuliang Cao, Yunhui Huang, Hanxi Yang
    Abstract:

    Sodium-ion batteries (SIBs) are considered to be a low-cost complement or competitor to Li-ion batteries for large-scale Electric Energy Storage applications; however, their development has been less successful due to the lack of suitable host materials to enable reversible Na+ insertion reactions. Prussian blue analogs (PBAs) appear to be attractive candidates for SIB cathodes because of their open channel structure, compositional and electrochemical tunability. In this paper, the authors present a comprehensive review on the recent advances in the development of PBA frameworks as SIB cathodes with particular attention to the structure-performance correlation of the PBA materials, and discuss the possible strategies to address the problems present in the SIB applications of PBAs. Also, the development of the PBA frameworks for the insertion cathodes of other monovalent and multivalent ions is briefly introduced, with the aim of providing a new insight into the design and development of new host materials for the next-generation advanced batteries.

  • energetic aqueous rechargeable sodium ion battery based on na2cufe cn 6 nati2 po4 3 intercalation chemistry
    Chemsuschem, 2014
    Co-Authors: Mengying Sun, Jiangfeng Qian, Yuliang Cao, Yifei Shen, Hanxi Yang
    Abstract:

    Aqueous rechargeable sodium-ion batteries have the potential to meet growing demand for grid-scale Electric Energy Storage because of the widespread availability and low cost of sodium resources. In this study, we synthesized a Na-rich copper hexacyanoferrate(II) Na2CuFe(CN)6 as a high potential cathode and used NaTi2(PO4)3 as a Na-deficient anode to assemble an aqueous sodium ion battery. This battery works very well with a high average discharge voltage of 1.4 V, a specific Energy of 48 Wh kg−1, and an excellent high-rate cycle stability with approximately 90 % capacity retention over 1000 cycles, achieving a new record in the electrochemical performance of aqueous Na-ion batteries. Moreover, all the anode, cathode, and electrolyte materials are low cost and naturally abundant and are affordable for widespread applications.

  • single crystal fefe cn 6 nanoparticles a high capacity and high rate cathode for na ion batteries
    Journal of Materials Chemistry, 2013
    Co-Authors: Wenwen Deng, Jiangfeng Qian, Yuliang Cao, Hanxi Yang
    Abstract:

    Prussian blue analogues are actively explored as low cost and high capacity cathodes for Na ion batteries; however, their applications are hindered by low capacity utilization and poor cyclability of these compounds. Here we show that this problem can be solved by controlling the purity and crystallinity of the Prussian blue lattices. As a model compound, single-crystal FeIIIFeIII(CN)6 nanoparticles are synthesized and found to have a sufficiently high capacity of 120 mA h g−1, an exceptional rate capability at 20 C and superior cyclability with 87% capacity retention over 500 cycles, showing great promise for Na ion battery applications. More significantly, these results provide a new insight into the intercalation chemistry of Prussian blue analogues and open new perspectives to develop Na Storage cathodes for widespread applications of Electric Energy Storage.

  • fe cn 6 4 doped polypyrrole a high capacity and high rate cathode material for sodium ion batteries
    RSC Advances, 2012
    Co-Authors: Min Zhou, Yuliang Cao, Limin Zhu, Ruirui Zhao, Jianfeng Qian, Hanxi Yang
    Abstract:

    A redox-active Fe(CN)6−4-doped polypyrrole was synthesized and found to have a remarkable redox capacity of 135 mA h g−1 in Na+ electrolyte, an excellent rate capability of 1600 mA g−1 and a strong capacity retention of 85% over 100 cycles, showing great promise for enabling low-cost and environmentally benign Na-ion batteries for large-scale Electric Energy Storage.

Francesco Melino - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of an integrated chp system with thermal and Electric Energy Storage for residential application
    Applied Energy, 2013
    Co-Authors: M Bianchi, Aniello Pascale, Francesco Melino
    Abstract:

    The aim of this paper is the evaluation of the profitability of micro-CHP systems for residential application. An integrated CHP system composed of a prime mover, an Electric Energy Storage system, a thermal Storage system and an auxiliary boiler has been considered. The study has been carried out taking into account a particular electrochemical Storage system which requires also thermal Energy, during its operation, for a better exploitation of the residual heat discharged by the prime mover. The prime mover could be a conventional Internal Combustion Engine or also an innovative system, such as fuel cell or organic Rankine cycle.

  • performance analysis of an integrated chp system with thermal and Electric Energy Storage for residential application
    Applied Energy, 2013
    Co-Authors: M Bianchi, Aniello Pascale, Francesco Melino
    Abstract:

    Abstract The aim of this paper is the evaluation of the profitability of micro-CHP systems for residential application. An integrated CHP system composed of a prime mover, an Electric Energy Storage system, a thermal Storage system and an auxiliary boiler has been considered. The study has been carried out taking into account a particular electrochemical Storage system which requires also thermal Energy, during its operation, for a better exploitation of the residual heat discharged by the prime mover. The prime mover could be a conventional Internal Combustion Engine or also an innovative system, such as fuel cell or organic Rankine cycle. An investigation of this integrated CHP system has been carried out, by means of an in-house developed calculation code, performing a thermo-economic analysis. This paper provides useful results, in order to define the optimum sizing of components of the integrated CHP system under investigation; the developed code allows also to evaluate the profitability and the primary Energy saving with respect to the separate production of Electricity and heat.

Hongyu Wang - One of the best experts on this subject based on the ideXlab platform.

  • solvation effect on intercalation behaviour of tetrafluoroborate into graphite electrode
    Journal of Power Sources, 2015
    Co-Authors: Masaki Yoshio, Li Qi, Hongyu Wang
    Abstract:

    Abstract Anion-intercalated graphite compounds are becoming attractive as high-potential positive electrode materials in some Electric Energy Storage devices. The intercalation of anions from electrolyte solutions to graphite electrode generally involves the co-entrance of organic solvent molecules inside the interlayer galleries of graphite, which has a great impact on the electrochemical behaviour of the graphite electrode. In situ XRD (X-ray diffraction) and EQCM (Electrochemical quartz crystal microbalance) techniques have been corporately employed to investigate the mechanism of BF 4 − intercalation into graphite positive electrode from three electrolyte solutions in activated carbon/graphite capacitors. The solvation states of BF 4 − by different solvents inside the graphite electrode have been correlated with the performance of AC/graphite capacitors using corresponding electrolyte solutions.

  • sodium titanate nanotube graphite an Electric Energy Storage device using na based organic electrolytes
    Journal of Power Sources, 2013
    Co-Authors: Liping Zhao, Hongyu Wang
    Abstract:

    Sodium titanate nanotube (Na-TNT) sample has been prepared by a hydrothermal method using TiO2 and NaOH as starting materials and then calcined at 400 degrees C in air. X-ray diffraction and N-2 adsorption-desorption tests have been employed to characterize its crystal and pore structure. The Na-TNT can be used as the negative electrode for Electric Energy Storage devices using Na+-based organic electrolytes. The charge Storage mechanism at the Na-TNT negative electrode has been investigated by electrochemical tests (galvanostatic charge-discharge, cyclic voltammetry, etc.), ex-situ XRD and HRTEM measurements. The Electric Energy Storage devices of Na-TNT/graphite have been constructed and the influence of graphite/Na-TNT mass ratio on their performance has been studied. (C) 2013 Elsevier B.V. All rights reserved.

  • sodium titanate nanotubes as negative electrode materials for sodium ion capacitors
    ACS Applied Materials & Interfaces, 2012
    Co-Authors: Li Qi, Hongyu Wang
    Abstract:

    The lithium-based Energy Storage technology is currently being considered for Electric automotive industry and even Electric grid Storage. However, the hungry demand for vast Energy sources in the modern society will conflict with the shortage of lithium resources on the earth. The first alternative choice may be sodium-related materials. Herein, we propose an Electric Energy Storage system (sodium-ion capacitor) based on porous carbon and sodium titanate nanotubes (Na-TNT, Na+-insertion compounds) as positive and negative electrode materials, respectively, in conjunction with Na+-containing non-aqueous electrolytes. As a low-voltage (0.1–2 V) sodium insertion nanomaterial, Na-TNT was synthesized via a simple hydrothermal reaction. Compared with bulk sodium titanate, the predominance of Na-TNT is the excellent rate performance, which exactly caters to the need for electrochemical capacitors. The sodium-ion capacitors exhibited desirable Energy density and power density (34 Wh kg–1, 889 W kg–1). Furthermor...

Chanan Singh - One of the best experts on this subject based on the ideXlab platform.

  • adequacy and economy analysis of distribution systems integrated with Electric Energy Storage and renewable Energy resources
    Power and Energy Society General Meeting, 2013
    Co-Authors: Chanan Singh
    Abstract:

    Summary form only given. The integration of Renewable Energy Resources (RER) into an existing distribution system is an important topic in dealing with Energy challenge the world is facing. With rapid development of Electric Energy Storage (EES) technologies, there is a growing interest in integrating both EES and RER into power systems to improve their reliability and economy. In this paper, the adequacy and economy of distribution systems integrated with both EES and RER are assessed. A novel Model Predictive Control (MPC)-based operation strategy is presented to minimize distribution system Energy purchasing cost by coordinating multiple power supplies from EES, RER and external grid. An islanding operation is implemented to improve the distribution system reliability and reduce customer interruption cost. A reliability and economy assessment framework based on sequential Monte Carlo method integrated with the MPC-based operation and islanding operation is proposed. Case studies are conducted to demonstrate the reliability and economy improvement by implementing the proposed operation strategies together with integration of EES and RER, and also investigate how EES capacity, power limit, and wind turbine generation capacity affect system reliability and economy.

  • Adequacy and economy analysis of distribution systems integrated with Electric Energy Storage and renewable Energy resources
    IEEE Transactions on Power Systems, 2012
    Co-Authors: Yixing Xu, Chanan Singh
    Abstract:

    The integration of renewable Energy resources (RER) into an existing distribution system is an important topic in dealing with Energy challenge the world is facing. With rapid development of Electric Energy Storage (EES) technologies, there is a growing interest in integrating both EES and RER into power systems to improve their reliability and economy. In this paper, the adequacy and economy of distribution systems integrated with both EES and RER are assessed. A novel model predictive control (MPC)-based operation strategy is presented to minimize distribution system Energy purchasing cost by coordinating multiple power supplies from EES, RER and external grid. An islanding operation is implemented to improve the distribution system reliability and reduce customer interruption cost. A reliability and economy assessment framework based on sequential Monte Carlo method integrated with the MPC-based operation and islanding operation is proposed. Case studies are conducted to demonstrate the reliability and economy improvement by implementing the proposed operation strategies together with integration of EES and RER, and also investigate how EES capacity, power limit, and wind turbine generation capacity affect system reliability and economy.

  • Optimal scheduling and operation of load aggregators with Electric Energy Storage facing price and demand uncertainties
    NAPS 2011 - 43rd North American Power Symposium, 2011
    Co-Authors: Yixing Xu, Le Xie, Chanan Singh
    Abstract:

    In competitive power markets, with increasing penetration of variable renewable Energy resources such as wind power, Electricity price becomes more uncertain. In distribution systems, adoption of renewable distributed generation technologies adds another dimension of uncertainty in load forecast. Facing these higher price and load uncertainties, it becomes more challenging for load aggregators to manage their Electricity cost. Within this context, this paper presents a Model Predictive Control (MPC)-based scheduling and operation strategy for the load aggregator with Electric Energy Storage (EES) to manage Electricity cost in day-ahead and real-time power markets with different levels of price and load uncertainties. Price and load forecasts are actively integrated into the scheduling and operation decision making process to determine the optimal operation. Two other strategies are also discussed and studied for comparison. Case studies demonstrate better performance of the proposed MPC-based strategy compared to the other two strategies facing different levels of price and load uncertainties. The MPC-based strategy is also shown to be robust with the increase of price and load uncertainties. The benefit of Energy arbitrage with MPC-based strategy is also illustrated.

  • Optimal scheduling and operation of load aggregator with Electric Energy Storage in power markets
    North American Power Symposium 2010 NAPS 2010, 2010
    Co-Authors: Yixing Xu, Le Xie, Chanan Singh
    Abstract:

    This paper presents an optimization framework for a load aggregator with Electric Energy Storage (EES) to determine its net imported power in Electricity markets. The EES is operated by the load aggregator. The imported power from both day-ahead and real-time markets is a combination of the load and the EES power charging and discharging. The load aggregator's objective is to minimize its Energy cost by scheduling the imported power in the day-ahead market and determining the imported power during operation in the real-time balancing market. The flexible operation of the EES is the tool for achieving this goal. Forecasted price and load are used to determine the optimal scheduling and operation to minimize the Energy cost. In the day-ahead market, a load aggregator uses the proposed method to determine the schedule of the imported power in each period with the day-ahead forecasted price and load. During real-time operation, the discrepancies caused by the forecast errors are settled in the real-time balancing market. Model Predictive Control (MPC)-based algorithm is used to determine its imported power in balancing market by using the most updated price and load forecast over a receding horizon. Results from two case studies with stationary EES and plug-in hybrid Electric vehicles (PHEV)' batteries respectively using the proposed method are presented to demonstrate the Energy cost savings.

Qing Wang - One of the best experts on this subject based on the ideXlab platform.

  • confinement induced high field antiferroElectric like behavior in a poly vinylidene fluoride co trifluoroethylene co chlorotrifluoroethylene graft polystyrene graft copolymer
    Macromolecules, 2011
    Co-Authors: Fangxiao Guan, Lianyun Yang, Jung Kai Tseng, Jing Wang, Qing Wang
    Abstract:

    An antiferroElectric-like polymer approach was proposed for high Electric Energy Storage and low loss performance by using a novel confinement concept. A poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft-polystyrene [P(VDF-TrFE-CTFE)-g-PS] graft copolymer with 14 wt % PS side chains was successfully synthesized. On the basis of the Electric displacement−Electric field loop study, a novel antiferroElectric-like behavior with extremely low remanent polarization was achieved in this graft copolymer even when the poling field reached as high as 400 MV/m. Compared with a P(VDF-TrFE) random copolymer having the same TrFE content, a similar discharged Energy density but a much lower hysteresis loss was observed. This novel antiferroElectric-like behavior at high poling fields was explained by the confinement (or insulation) effect. After crystallization-induced microphase separation, PS side chains were segregated to the periphery of P(VDF-TrFE) crystals, forming a nanoscale interfa...

  • effects of polymorphism and crystallite size on dipole reorientation in poly vinylidene fluoride and its random copolymers
    Macromolecules, 2010
    Co-Authors: Fangxiao Guan, Jing Wang, Qing Wang
    Abstract:

    Poly(vinylidene fluoride) (PVDF) and poly(VDF-co-hexafluoropropylene) [P(VDF−HFP)] films having different polymorphisms and crystallite sizes but a similar crystal orientation (i.e., c-axes parallel to the film surface) were prepared by different film processing methods. Effects of polymorphism and crystallite size on the dipole reorientation behavior and Electric Energy Storage/release were studied by Electric displacement−Electric field (D−E) loop measurements. Experimental results suggested that coupling interactions among ferroElectric domains, which could be adjusted by different polymorphisms and/or crystallite sizes, determined dipole reorientation/switching behaviors. Note that the ferroElectric domain coupling is realized via induced compensation polarizations from the media (either amorphous or crystalline PVDF) between aligned ferroElectric domains. A high β rather than α/δ content and a large crystallite size facilitated the coupling interactions among ferroElectric domains, and thus dipoles i...

  • crystal orientation effect on Electric Energy Storage in poly vinylidene fluoride co hexafluoropropylene copolymers
    Macromolecules, 2010
    Co-Authors: Fangxiao Guan, Jing Wang, Qing Wang
    Abstract:

    By using different preparation and processing methods, poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF−HFP)] films with different crystal orientations were fabricated. Anisotropic diElectric properties and different Electric Energy Storages were observed in these films. When the PVDF crystals in a film oriented with their c-axes perpendicular to the applied Electric field, they exhibited large polarizability because the CF2 dipole moments were randomly distributed in a plane parallel to the Electric field. As a result, high diElectric constant and high Electric Energy density were achieved. On the contrary, when the crystal c-axes in a film oriented parallel to the Electric field (or the CF2 dipole moments perpendicular to the Electric field), polarization became difficult. Consequently, low diElectric constant and low Electric Energy density resulted. The anisotropic polarizability was also displayed at high Electric fields as evidenced by the difference in the remnant/maximum polarization and th...