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Hou Z.,Anhui University of Science and Technology | Zhang X.,Anhui University of Science and Technology | Liang J.,Anhui University of Science and Technology | Lia X.,Anhui University of Science and Technology | And 3 more authors.
RSC Advances | Year: 2015

Si@C composites have been solvothermally synthesized by the reaction of ethanol or acetone with Mg2Si at 650 °C, followed by HCl washing. Ethanol or acetone can oxidise Mg2Si to form Si, and at the same time, they are reduced to synchronously form carbon coated on the surface of the generated Si nanoparticles. As lithium ion battery anode, the as-synthesized Si@C composites obtained from the reaction of acetone with Mg2Si deliver a reversible capacity of 3277 mA h g-1 at 0.36 A g-1 and remain 892 mA h g-1 at 3.6 A g-1 after 350 cycles. © The Royal Society of Chemistry 2015. Source


Liang J.,Anhui University of Science and Technology | Li X.,Anhui University of Science and Technology | Hou Z.,Anhui University of Science and Technology | Zhang T.,Anhui University of Science and Technology | And 3 more authors.
Chemistry of Materials | Year: 2015

Macro-Ge powder has been synthesized with a novel hydrothermal reduction of commercial GeO2 at 200°C in an autoclave. The obtained macro-Ge product demonstrates a honeycomb-like macroscopic network structure with a high tap density of 2.19 g cm-3. As for the anode material of lithium ion batteries, the macro-Ge electrode exhibits 1350 mAh g-1 at the current rate of 0.2 C and with 64% capacity retention over 3500 total cycles at 1 C. The macro-Ge contains a honeycomb porous structure, which allows for a high volumetric capacity (∼3000 mAh cm-3). Moreover, the symmetrical and asymmetric rate behaviors also provide its excellent electrochemical property. For example, the macro-Ge electrode can be rapidly charged to 1130 mAh g-1 in 3 min (20 C) and 890 mAh g-1 in 90 s (40 C) using the constant discharge mode of 1 C. Furthermore, the Ge electrode still maintains over 1020 mAh g-1 at 1 C for 300 cycles at the high temperature (55°C) environment. When coupled with a commercial LiCoO2 cathode, a 3.5 V lithium-ion battery with capacity retention of 91% (∼364 Wh kg-1) over 100 cycles is achieved. These outstanding properties may be attributed to the honeycomb structure, for which the porous architectures supply the high efficient ionic transport and buffers the volume change during the lithiation/delithiation processes. Moreover, with bulk frameworks it ensures the high tap density and further improves the energy density. It is supported that the macro-Ge acts as attractive anode materials for further application in rechargeable lithium ion batteries. © 2015 American Chemical Society. Source


Wang H.,Haitian Plastics Machinery Ltd. | Wang H.,Shanghai University | Qi H.,Ningbo HAITIAN Drive Systems Co. | Xu M.,Ningbo HAITIAN Drive Systems Co. | And 6 more authors.
Proceedings - 2014 7th International Symposium on Computational Intelligence and Design, ISCID 2014 | Year: 2015

Currently, homogeneous transformation method has been widely used for its advantages in robot. Its more commonly used modeling methods are classic Denavit-Hartenberg method and modified Denavit-Hartenberg method, but the relationship between the two is very few devoted. Then, the use area is limited. Therefore, the relationship between classic Denavit-Hartenberg method and modified Denavit-Hartenberg method for robotics research has important practical significance. Based on this, the geometric representations of classic Denavit-Hartenberg method and modified Denavit-Hartenberg method are described respectively, the models of link parameters are built by the two, and the corresponding transformation matrix is deduced. The relationship between classic Denavit-Hartenberg method and modified Denavit-Hartenberg method is researched deeply, and the relational expression of classic Denavit-Hartenberg method and modified Denavit-Hartenberg method is obtained. The research results of this paper are useful for the robot kinematics, dynamics and control algorithms. © 2014 IEEE. Source


Han G.,East China University of Science and Technology | Li B.,East China University of Science and Technology | Ye Z.,East China University of Science and Technology | Cao C.,NINGBO VEKEN BATTERY CO. | Guan S.,East China University of Science and Technology
International Journal of Electrochemical Science | Year: 2012

Vinylene carbonate (VC) and 1,3-propane sultone (1,3-PS) have been used as the electrolyte additives to improve the high temperature safety of the lithium ion batteries. The electrochemical performance of ethylene carbonate-based binary electrolytes without and with additives on graphite electrode is studied by cyclic voltammetry and electrochemical impedance spectroscopic. The cycle performances of the graphite/LiCoO2 batteries with two additives are measured by battery testing system at 25 °C and 60 °C. The morphology and composition of the solid electrolyte interphase are analyzed by scanning electron microscopy and X-ray Photoelectron Spectroscopy, respectively. In summary, the co-use of VC and 1,3-PS can greatly improve the cycle life and suppress swelling behavior of graphite/LiCoO2 cells at elevated temperature. © 2012 by ESG. Source


Han G.,East China University of Science and Technology | Ye Z.,East China University of Science and Technology | Cao C.,NINGBO VEKEN BATTERY CO. | Liu B.,East China University of Science and Technology | And 2 more authors.
International Journal of Electrochemical Science | Year: 2012

In this paper, we calculate the Lowest Unoccupied Molecular Orbital (LUMO) level of the 1,8-naphthosultone (1,8-NS) by density functional theory. The effects of 1,8-NS on the high temperature performances of lithium ion batteries are evaluated by battery test system. The electrochemical performances are measured by cyclic voltammetry and electrochemical impedance spectroscopic. By adding 1 wt % 1,8-NS into a commercial binary electrolyte of lithium ion battery, the initial discharge capacity and cycle stability of lithium ion battery are improved significantly at 60 °C. By X-ray photoelectron spectroscopy analysis, we suggest that the improvement may be attributed to the 1,8-NS being reduced to form Li2S, R-SO2Li and R-SO3Li phase on the graphite electrode. Thus, the reduction products covered on the graphite electrode may reduce the resistance of solid electrolyte interphase and suppress the battery swell. © 2012 by ESG. Source

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