排序方式: 共有18条查询结果,搜索用时 31 毫秒
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Liu Jingze Fei Qingguo Wu Shaoqing Tang Zhenhuan Zhang Dahai 《Nonlinear dynamics》2021,106(3):1869-1890
Nonlinear Dynamics - Rolling bearing and squeeze film damper will introduce structural nonlinearity into the dynamic model of aeroengine. Rubbing will occur due to the clearance reduction design of... 相似文献
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锂离子电池纳米材料研究 总被引:27,自引:0,他引:27
报道了作者最近在锂离子电池纳米材料方面的研究工作 .包括纳米负极材料 (如Sb ,SnSb ,CuSn及Si) ,纳米正极材料 (如CuS)合成 ,电化学性质 ,以及纳米材料的晶体结构与形貌在充放电过程中的变化等研究 .此外还报道了具有纳米尺度阴离子的锂盐在聚合物电解质中的增塑作用以及纳米硅Raman光谱和光致发光谱受电化学锂掺杂的影响 .最后对纳米材料的本征性质与其电化学性质的关系进行了讨论 ,并对其在锂离子电池中的应用及在基础研究方面的意义给予了评述 . 相似文献
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Metal-free,heteroatom functionalized carbon-based catalysts have made remarkable progress in recent years in a wide range of applications related to energy storage and energy generation.In this study,high surface area mesoporous ordered sulphur doped carbon materials are obtained via one-pot hydrothermal synthesis of carbon/SBA-15 composite after removal of in-situ synthesized hard template Si O2.2-thiophenecarboxy acid as sulphur source gives rise to sulphur doping level of 5.5 wt%.Comparing with pristine carbon,the sulphur doped mesoporous ordered carbon demonstrates improved electro-catalytic activity in the oxygen reduction reaction in alkaline solution. 相似文献
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目前商用锂离子电池主要使用碳负极材料.零应变的钛酸锂被认为是比碳更安全、寿命更长的负极材料,在混合电动汽车和风/光/电并网、智能电网等领域有独特的应用前景.但是,采用钛酸锂负极的锂离子电池在充放电及储存过程中极易发生气胀,从而导致外壳变形、电池向外析气、电池性能急剧下降等问题,这是制约钛酸锂实际应用的最大障碍.本文首先介绍了钛酸锂基锂离子电池的产业发展状况,其采用的正极材料分别为Li(NixCoyMn1-x-y)O2、LiMn2O4、LiFePO4与LiCoO2等四种.针对其气胀问题,从钛酸锂电极材料的界面特性、水分、电解液还原分解、负极电位、杂质等方面综述了相关的最新研究进展.同时结合本课题组的研究工作,从材料、工艺、使用等角度指出了气胀的改进措施,最后,提出钛酸锂基锂离子电池气胀方面亟待解决的问题及今后的研究重点. 相似文献
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Ruding Zhang Jiajia Huang Wenzhuo Deng Jingze Bao Yilong Pan Shuping Huang Chuan‐Fu Sun 《Angewandte Chemie (International ed. in English)》2019,58(46):16474-16479
A key challenge for potassium‐ion batteries is to explore low‐cost electrode materials that allow fast and reversible insertion of large‐ionic‐size K+. Here, we report an inorganic‐open‐framework anode (KTiOPO4), which achieves a reversible capacity of up to 102 mAh g?1 (307 mAh cm?3), flat voltage plateaus at a safe average potential of 0.82 V (vs. K/K+), a long lifespan of over 200 cycles, and K+‐transport kinetics ≈10 times faster than those of Na‐superionic conductors. Combined experimental analysis and first‐principles calculations reveal a charge storage mechanism involving biphasic and solid solution reactions and a cell volume change (9.5 %) even smaller than that for Li+‐insertion into graphite (≈10 %). KTiOPO4 exhibits quasi‐3D lattice expansion on K+ intercalation, enabling the disintegration of small lattice strain and thus high structural stability. The inorganic open‐frameworks may open a new avenue for exploring low‐cost, stable and fast‐kinetic battery chemistry. 相似文献
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Ruding Zhang Jiajia Huang Wenzhuo Deng Jingze Bao Yilong Pan Shuping Huang Chuan‐Fu Sun 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(46):16626-16631
A key challenge for potassium‐ion batteries is to explore low‐cost electrode materials that allow fast and reversible insertion of large‐ionic‐size K+. Here, we report an inorganic‐open‐framework anode (KTiOPO4), which achieves a reversible capacity of up to 102 mAh g?1 (307 mAh cm?3), flat voltage plateaus at a safe average potential of 0.82 V (vs. K/K+), a long lifespan of over 200 cycles, and K+‐transport kinetics ≈10 times faster than those of Na‐superionic conductors. Combined experimental analysis and first‐principles calculations reveal a charge storage mechanism involving biphasic and solid solution reactions and a cell volume change (9.5 %) even smaller than that for Li+‐insertion into graphite (≈10 %). KTiOPO4 exhibits quasi‐3D lattice expansion on K+ intercalation, enabling the disintegration of small lattice strain and thus high structural stability. The inorganic open‐frameworks may open a new avenue for exploring low‐cost, stable and fast‐kinetic battery chemistry. 相似文献
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The title compound is an "off-on" rhodamine probe. It exhibits strong pH dependence and responds to protons. The optimized geometries and energies calculation of the protonation were determined at the B3LYP level using DFT. The theoretical results are in good agreement with the single crystal analysis and the spectral results. 相似文献