It is urgent to solve the problems of the dramatic volume expansion and pulverization of SnO2 anodes during cycling process in battery systems. To address this issue, we design a hybrid structure of N-doped carbon fibers@SnO2 nanoflowers (NC@SnO2) to overcome it in this work. The hybrid NC@SnO2 is synthesized through the hydrothermal growth of SnO2 nanoflowers on the surface of N-doped carbon fibers obtained by electrospinning. The NC is introduced not only to provide a support framework in guiding the growth of the SnO2 nanoflowers and prevent the flower-like structures from agglomeration, but also serve as a conductive network to accelerate electronic transmission along one-dimensional structure effectively. When the hybrid NC@SnO2 was served as anode, it exhibits a high discharge capacity of 750 mAh g−1 at 1 A g−1 after 100 cycles in Li-ion battery and 270 mAh g−1 at 100 mA g−1 for 100 cycles in Na-ion battery, respectively. Electronic supplementary materialThe online version of this article (10.1007/s40820-017-0172-2) contains supplementary material, which is available to authorized users.

No abstract

Rechargeable lithium sulfur battery has been regarded as one of the most promising power source 5 systems for the next generation EVs or HEVs. However, the low utilization of active materials, rapid capacity degradation, and poor rate capability seriously restrict its large-scale applications in commercial markets. Herein, a novel strategy, using hydrophilic separator, is reported to improve the electrochemical performance of Li-S batteries. Herein, a novel strategy, using hydrophilic separator which is prepared by auto-oxidization and self-polymerization of dopamine monomer onto the surface 10 of conventional hydrophobic separators, is reported to improve the electrochemical performance of Li-S batteries. The cells with the hydrophilic separator show significantly enhanced cycle performance. At the rate of 0.2 C, the battery demonstrates an initial capacity of 1271 mAh g -1 , and the capacity can still retained at 1020.3 mAh g -1 after 30 cycles, which improves 77% compared with the cells using conventional seperators. 15 75 2300) into alkaline solution with dissolved dopamine monomer.

The accurate control for the vehicle height and leveling adjustment system of an electronic air suspension (EAS) still is a challenging problem that has not been effectively solved in prior researches. This paper proposes a new adaptive controller to control the vehicle height and to adjust the roll and pitch angles of the vehicle body (leveling control) during the vehicle height adjustment procedures by an EAS system. A nonlinear mechanism model of the full-car vehicle height adjustment system is established to reflect the system dynamic behaviors and to derive the system optimal control law. To deal with the nonlinear characters in the vehicle height and leveling adjustment processes, the nonlinear system model is globally linearized through the state feedback method. On this basis, a fuzzy sliding mode controller (FSMC) is designed to improve the control accuracy of the vehicle height adjustment and to reduce the peak values of the roll and pitch angles of the vehicle body. To verify the effectiveness of the proposed control method more accurately, the full-car EAS system model programmed using AMESim is also given. Then, the co-simulation study of the FSMC performance can be conducted. Finally, actual vehicle tests are performed with a city bus, and the test results illustrate that the vehicle height adjustment performance is effectively guaranteed by the FSMC, and the peak values of the roll and pitch angles of the vehicle body during the vehicle height adjustment procedures are also reduced significantly. This research proposes an effective control methodology for the vehicle height and leveling adjustment system of an EAS, which provides a favorable control performance for the system.

No abstract