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Ethylene Carbonate-free Fluoroethylene Carbonate-based Electrolyte Works Better For Freestanding Si-based Composite Paper Anodes For Li-ion Batteries
Title
Ethylene Carbonate-free Fluoroethylene Carbonate-based Electrolyte Works Better For Freestanding Si-based Composite Paper Anodes For Li-ion Batteries.
Creator
Yao, K., Zheng, J. P., Liang, R.
Abstract/Description
Fluoroethylene carbonate (FEC)-based electrolytes using FEC as the co-solvent (50 wt%) are investigated and compared with the electrolyte using FEC as the additive (10 wt%) for freestanding Si-carbon nanotubes (CNTs) composite paper anodes for Li-ion batteries. The ethylene carbonate (EC)-free FEC-based electrolyte is found to achieve higher specific capacity and better capacity retention in terms of long-term cycling. After 500 cycles, the capacity retention of the cell using diethyl...
Show moreFluoroethylene carbonate (FEC)-based electrolytes using FEC as the co-solvent (50 wt%) are investigated and compared with the electrolyte using FEC as the additive (10 wt%) for freestanding Si-carbon nanotubes (CNTs) composite paper anodes for Li-ion batteries. The ethylene carbonate (EC)-free FEC-based electrolyte is found to achieve higher specific capacity and better capacity retention in terms of long-term cycling. After 500 cycles, the capacity retention of the cell using diethyl carbonate (DEC)-FEC (1:1 w/w) is increased by 88% and 60% compared to the cells using EC-DEC-FEC (45:45:10 w/w/w) and EC-FEC (1:1 w/w), respectively. Through SEM-EDX and XPS analyses, a possible reaction route of formation of fluorinated semicarbonates and polyolefins from FEC is proposed. The inferior cell performance related to the EC-containing electrolytes is likely due to the formation of more polyolefins, which do not favor Li ion migration.
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Date Issued
2018-03-31
Identifier
FSU_libsubv1_wos_000428009400019, 10.1016/j.jpowsour.2018.02.013
Format
Citation
Ground Leakage Current Analysis A Suppression In A 60-kw 5-level T-type Transformerless Sic Pv Inverter
Title
Ground Leakage Current Analysis A Suppression In A 60-kw 5-level T-type Transformerless Sic Pv Inverter.
Creator
Wang, Lu, Shi, Yanjun, Shi, Yuxiang, Xie, Ren, Li, Hui
Abstract/Description
In this paper, ground leakage current suppression in a 60-kW 5-level T-type (5LT(2)) transformerless SiC photovoltaic (PV) inverter has been presented. The common mode (CM) equivalent circuit is analyzed based on a high frequency (HF) CM loop and a low frequency (LF) CM loop, respectively. In the 5LT(2) inverter, the derived HF CM voltage (CMV) is found to have 86% reduction compared to that of a 3-level T-type (3LT(2)) inverter. The simulation and experiment results are provided to...
Show moreIn this paper, ground leakage current suppression in a 60-kW 5-level T-type (5LT(2)) transformerless SiC photovoltaic (PV) inverter has been presented. The common mode (CM) equivalent circuit is analyzed based on a high frequency (HF) CM loop and a low frequency (LF) CM loop, respectively. In the 5LT(2) inverter, the derived HF CM voltage (CMV) is found to have 86% reduction compared to that of a 3-level T-type (3LT(2)) inverter. The simulation and experiment results are provided to demonstrate the advantages of 5LT(2) inverter on HF leakage current suppression. In addition, LF CMV caused by neutral point (NP) voltage oscillation has been analyzed in this paper. It is shown that the LF CMV is nearly proportional to the NP voltage oscillation. Furthermore, an LF CMV compensation method is proposed to suppress the LF CMV by 64%, which is verified by simulation and experiment results. Finally, the leakage current shows 79% reduction in the 5LT(2) inverter compared to the conventional 3LT(2) inverter in the experiment. A further 52% leakage current reduction is achieved by the LF CMV compensation in the 5LT(2) inverter.
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Date Issued
2018-02
Identifier
FSU_libsubv1_wos_000414414600036, 10.1109/TPEL.2017.2679488
Format
Citation
Magnetic Shielding Characteristics Of Hybrid High-temperature Superconductor/ferromagnetic Material Multilayer Shields
Title
Magnetic Shielding Characteristics Of Hybrid High-temperature Superconductor/ferromagnetic Material Multilayer Shields.
Creator
Kvitkovic, Jozef, Patel, Sagarkumar, Pamidi, Sastry
Abstract/Description
Magnetic shielding characteristics of hybrid shields consisting of second generation high-temperature superconducting tapes and ferromagnetic materials are presented. Shields with multiple layers with several combinations of superconducting and ferromagnetic materials showed interesting patterns. Shielding factors as high as 95% are observed for three-layer hybrid shielding structures. The data presented offers new ways to achieve the required shielding factors in a given application with...
Show moreMagnetic shielding characteristics of hybrid shields consisting of second generation high-temperature superconducting tapes and ferromagnetic materials are presented. Shields with multiple layers with several combinations of superconducting and ferromagnetic materials showed interesting patterns. Shielding factors as high as 95% are observed for three-layer hybrid shielding structures. The data presented offers new ways to achieve the required shielding factors in a given application with minimal use of expensive superconductors.
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Date Issued
2017-06
Identifier
FSU_libsubv1_wos_000395453500001, 10.1109/TASC.2016.2645561
Format
Citation
Technical cross-fertilization between terrestrial microgrids and ship power systems
Title
Technical cross-fertilization between terrestrial microgrids and ship power systems.
Creator
Hebner, Robert E., Uriarte, Fabian M., Kwasinski, Alexis, Gattozzi, Angelo L., Estes, Hunter B., Anwar, Asif, Cairoli, Pietro, Dougal, Roger A., Feng, Xianyong, Chou, Hung-Ming,...
Show moreHebner, Robert E., Uriarte, Fabian M., Kwasinski, Alexis, Gattozzi, Angelo L., Estes, Hunter B., Anwar, Asif, Cairoli, Pietro, Dougal, Roger A., Feng, Xianyong, Chou, Hung-Ming, Thomas, Laurence J., Pipattanasomporn, Manisa, Rahman, Saifur, Katiraei, Farid, Steurer, Michael, Faruque, M. Omar, Rios, Mario A., Ramos, Gustavo A., Mousavi, Mirrasoul J., Mccoy, Timothy J.
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Abstract/Description
Aspects of terrestrial microgrids and ship power systems are examined. The work exposes a variety of technical synergies from these two power systems to effectively advance their technologies. Understanding their overlap allows congruent efforts to target both systems; understanding their differences hinders conflict and redundancy in early-stage design. The paper concludes by highlighting how an understanding of both systems can reduce the investment in research resources.
Date Issued
2016-04
Identifier
FSU_libsubv1_wos_000374333000002, 10.1007/s40565-015-0108-0
Format
Citation
Thermal analysis of a DC electromagnet with high thermal conductivity inserts
Title
Thermal analysis of a DC electromagnet with high thermal conductivity inserts.
Creator
Yang, Sam
Abstract/Description
This paper elaborates a thermal analysis of a DC electromagnet cooled by high thermal conductivity discs, via which heat is conducted away from the hot spot to the heat sinks at inner and outer disc surfaces. In this work, a dimensionless mathematical expression for the hot spot temperature in the coil was derived and solved analytically. The solution was then verified numerically with a commercial FEA software. Subsequently, the model was employed to investigate the hot spot temperature...
Show moreThis paper elaborates a thermal analysis of a DC electromagnet cooled by high thermal conductivity discs, via which heat is conducted away from the hot spot to the heat sinks at inner and outer disc surfaces. In this work, a dimensionless mathematical expression for the hot spot temperature in the coil was derived and solved analytically. The solution was then verified numerically with a commercial FEA software. Subsequently, the model was employed to investigate the hot spot temperature variation with respect to the number of discs for a given magnetic performance. The study also examined how the change in heat flow direction, with respect to the number of discs, affected the overall thermal performance of an electromagnet. According to the results, electromagnets become thinner and longer as the number of discs increase, which in turn lowers the hot spot temperature. Furthermore, heat is observed to ow axially with smaller number of discs, whereas radial heat ow predominates as this number increases. In summary, the results infer that a thermally efficient electromagnet can be designed by minimizing the heat ow resistance in the coil, with shorter (or highly conductive) path for the hot spot to easily access the heat sink.
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Date Issued
2016-02-02
Identifier
FSU_libsubv1_scholarship_submission_1903
Format
Citation