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能量均衡技术一直是无线自组织网络的热点研究领域.在深入研究网络信息传输特性的基础上,提出了一种基于移动-能量代价函数的无线自组织网络路由策略,并用于网络信息传输.首先,本文考虑节点连通性、能量均衡性,提出了一种节点移动策略;然后,以传输路径节点集合中的瓶颈节点剩余能量、传输链路数量作为准则,建立以网络节点为对象的能量代价函数.基于移动-能量代价函数的路由策略从链路层的决策转移到节点层的决策.最后,采用MATLAB数值仿真该路由策略的性能,结果显示:本文提出的移动-能量代价函数的路由策略既保持了原有路由优化的精度,延迟网络瓶颈节点能量下降速度,提高网络生存时间. 相似文献
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本文对韶钢中板轧机2500kw直流电机主控系统几种跳闸故障现象进行了分析,并提出处理方法。 相似文献
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A High‐Performance Li–O2 Battery with a Strongly Solvating Hexamethylphosphoramide Electrolyte and a LiPON‐Protected Lithium Anode
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Bin Zhou Limin Guo Yantao Zhang Jiawei Wang Lipo Ma Wen‐Hua Zhang Zhengwen Fu Zhangquan Peng 《Advanced materials (Deerfield Beach, Fla.)》2017,29(30)
The aprotic Li–O2 battery has attracted a great deal of interest because theoretically it can store more energy than today's Li‐ion batteries. However, current Li–O2 batteries suffer from passivation/clogging of the cathode by discharged Li2O2, high charging voltage for its subsequent oxidation, and accumulation of side reaction products (particularly Li2CO3 and LiOH) upon cycling. Here, an advanced Li–O2 battery with a hexamethylphosphoramide (HMPA) electrolyte is reported that can dissolve Li2O2, Li2CO3, and LiOH up to 0.35, 0.36, and 1.11 × 10?3m , respectively, and a LiPON‐protected lithium anode that can be reversibly cycled in the HMPA electrolyte. Compared to the benchmark of ether‐based Li–O2 batteries, improved capacity, rate capability, voltaic efficiency, and cycle life are achieved for the HMPA‐based Li–O2 cells. More importantly, a combination of advanced research techniques provide compelling evidence that operation of the HMPA‐based Li–O2 battery is backed by nearly reversible formation/decomposition of Li2O2 with negligible side reactions. 相似文献
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Xingjie Fu Tiantian Wang Wenzhong Shen Miaoli Jiang Youwei Wang Qiushi Dai Da Wang Zhenping Qiu Yelong Zhang Kuirong Deng Qingguang Zeng Ning Zhao Xiangxin Guo Zheng Liu Jianjun Liu Zhangquan Peng 《Advanced materials (Deerfield Beach, Fla.)》2020,32(26):2000575
Garnet-type solid-state electrolytes (SSEs) are promising for the realization of next-generation high-energy-density Li metal batteries. However, a critical issue associated with the garnet electrolytes is the poor physical contact between the Li anode and the garnet SSE and the resultant high interfacial resistance. Here, it is reported that the Li|garnet interface challenge can be addressed by using Li metal doped with 0.5 wt% Na (denoted as Li*) and melt-casting the Li* onto the garnet SSE surface. A mechanistic study, using Li6.4La3Zr1.4Ta0.6O12 (LLZTO) as a model SSE, reveals that Li2CO3 resides within the grain boundaries of newly polished LLZTO pellet, which is difficult to remove and hinders the wetting process. The Li* melt can phase-transfer the Li2CO3 from the LLZTO grain boundary to the Li*’s top surface, and therefore facilitates the wetting process. The obtained Li*|LLZTO demonstrates a low interfacial resistance, high rate capability, and long cycle life, and can find applications in future all-solid-state batteries (e.g., Li*|LLZTO|LiFePO4). 相似文献
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Rui Xu Yu Yao Haiyun Wang Yifei Yuan Jiawei Wang Hai Yang Yu Jiang Pengcheng Shi Xiaojun Wu Zhangquan Peng Zhong-Shuai Wu Jun Lu Yan Yu 《Advanced materials (Deerfield Beach, Fla.)》2020,32(52):2003879
The potassium–selenium (K–Se) battery is considered as an alternative solution for stationary energy storage because of abundant resource of K. However, the detailed mechanism of the energy storage process is yet to be unraveled. Herein, the findings in probing the working mechanism of the K-ion storage in Se cathode are reported using both experimental and computational approaches. A flexible K–Se battery is prepared by employing the small-molecule Se embedded in freestanding N -doped porous carbon nanofibers thin film (Se@NPCFs) as cathode. The reaction mechanisms are elucidated by identifying the existence of short-chain molecular Se encapsulated inside the microporous host, which transforms to K2Se by a two-step conversion reaction via an “all-solid-state” electrochemical process in the carbonate electrolyte system. Through the whole reaction, the generation of polyselenides (K2Sen, 3 ≤ n ≤ 8) is effectively suppressed by electrochemical reaction dominated by Se2 molecules, thus significantly enhancing the utilization of Se and effecting the voltage platform of the K–Se battery. This work offers a practical pathway to optimize the K–Se battery performance through structure engineering and manipulation of selenium chemistry for the formation of selective species and reveal its internal reaction mechanism in the carbonate electrolyte. 相似文献
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本文评述了过去一年锂-氧电池在几个关键科学问题上的进展。涉及的科学问题包括:反应机理是什么?反应位点在何处?副反应由谁引发? 相似文献