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Liang B.,Changsha University of Science and Technology | Liang B.,Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle | Jiang Q.,Changsha University of Science and Technology | Tang S.,Changsha University of Science and Technology | And 2 more authors.
Journal of Power Sources | Year: 2016

Porous polymer electrolytes (PPEs) are attractive for developing lithium-ion batteries because of the combined advantages of liquid and solid polymer electrolytes. In the present study, a new porous polymer membrane doped with phytic acid (PA) is prepared, which is used as a crosslinker in polymer electrolyte matrix and can also plasticize porous polymer electrolyte membranes, changing them into soft tough flexible materials. A PEO-PMMA-LiClO4-x wt.% PA (x = weight of PA/weight of polymer, PEO: poly(ethylene oxide); PMMA: poly(methyl methacrylate)) polymer membrane is prepared by a simple evaporation method. The effects of the ratio of PA to PEO-PMMA on the properties of the porous membrane, including morphology, porous structure, and mechanical property, are systematically studied. PA improves the porous structure and mechanical properties of polymer membrane. The maximum tensile strength and elongation of the porous polymer membranes are 20.71 MPa and 45.7% at 15 wt.% PA, respectively. Moreover, the PPEs with 15 wt.% PA has a conductivity of 1.59 × 10-5 S/cm at 20 °C, a good electrochemical window (>5 V), and a low interfacial resistance. The results demonstrate the compatibility of the mechanical properties and conductivity of the PPEs, indicating that PPEs have good application prospects for lithium-ion batteries. © 2015 Elsevier B.V. All rights reserved.


Liang B.,Changsha University of Science and Technology | Liang B.,Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle | Tang S.,Changsha University of Science and Technology | Jiang Q.,Changsha University of Science and Technology | And 4 more authors.
Electrochimica Acta | Year: 2015

This paper presents the preparation and characterization of a series of PEO-PMMA composites containing different lithium salts (LiClO4 or LiTFSI) with or without nano-Al2O3. Nano-Al2O3 is added to the polymer electrolytes to alter the morphology, ionic conductivity, interfacial and thermal shrinkage properties. Nano-Al2O3 can effectively improve the stability of the polymer electrolyte membrane interface. The tensile strength of the PEO-PMMA-LiTFSI-Al2O3 electrolyte membrane is 3.24 MPa at room temperature. The study shows that the ion conductivities at room temperature for PEO-PMMA-LiTFSI (EO/Li+ = 10) and PEO-PMMA-LiTFSI-Al2O3 (EO/Li+ = 10) are 6.71 × 10-7 S/cm and 9.39 × 10-7 S/cm, respectively. A good dimensional stability was observed for PEO-PMMA-LiTFSI with a thermal shrinkage of 8.7%. The electrochemical windows of PEO-PMMA-LiTFSI and PEO-PMMA-LiTFSI-Al2O3 are all stable up to 4.6 V versus Li+/Li, which makes them good electrolyte candidates of lithium ion batteries with high-potential cathodes. © 2015 Elsevier Ltd. All rights reserved.


Jiang Q.,Changsha University of Science and Technology | Li S.,Changsha University of Science and Technology | Tang W.,Changsha University of Science and Technology | Liang B.,Changsha University of Science and Technology | Liang B.,Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle
Chemistry Bulletin / Huaxue Tongbao | Year: 2014

Polymer lithium ion batteries (PLIBs) have widely potential applications as energy storage devices in electronic products. The electrode/polymer electrolyte (E/P) interfacial compatibility affects the electric conductivity, safety, and mechanical properties of the PLIBs. To better understand the electrochemical reaction and formation mechanism of interface is the key to solve the problem of compatibility. In this paper, the progress of E/P interfacial compatibility and relative research technique in recent years was reviewed and prospected.


Zou T.,Changsha University of Science and Technology | Zou T.,Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle | Zhao L.,Guangdong Police College | Zhang Y.,Guangdong Police College | And 2 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2015

The estimation of impact velocity is essential for the reconstruction simulation of pedestrian-vehicle crash accident, but the impact velocity prediction method based on the throw distance of pedestrian and the post braking distance of vehicle is nullified when crash position is unknown. However it is found that the final distance between pedestrian and vehicle after crash is measurable, so which is used to estimate impact velocity in this paper. On the basis of classical mechanics theory and some assumptions, the relationship between pedestrian throw distance and vehicle post braking distance is investigated, and based on which a impact velocity estimation model is set up based on final pedestrian-vehicle distance. Various verifications are conducted on the results of model calculation. The results show that the calculation outcome based on the impact velocity estimation model established well agree with the results of PC-Crash simulation and the test data and typical cases presented in literatures. ©, 2015, SAE-China. All right reserved.


Zhang J.,Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle | Long C.-G.,Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle | Zhou D.-W.,Hunan University
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2013

The dehydrogenation behaviors and kinetics of three kinds of MgH2(110) surfaces including complete, with Mg atom vacancy or Pd atom doping are investigated by first-principles calculation method based on the density functional theory. The influence mechanism of vacancy and doping defects on the dehydrogenation kinetics were revealed from the perspective of electronic structures. The results indicated that the site of six fold-coordinated Mg atom on MgH2(110) surface was the perior site for creating Mg vacancy or Pd doping. The barriers of hydrogen desorption on MgH2(110) surface were significantly decreased due to Mg vacancy or Pd doping as compared with that of complete surface. This explained the experimental phenomena to some extent that nanocrystalline modulation and catalytic doping were beneficial to improve the dehydrogenation kinetics of MgH2 system. The analysis of electronic structures implied that the energy gap near Fermi energy level of MgH2 surface is narrowed and the corresponding bonding electrons number at lower energy level decreased due to Mg vacancy or Pd doping. This leads to the decreased stability of the atomic layers of near surface and weakened interactions of Mg-H of surface.

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