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331.
Samuel Jayaraj Richard Prabakar Amol Bhairuba Ikhe Woon-Bae Park Docheon Ahn Kee-Sun Sohn Myoungho Pyo 《Advanced functional materials》2023,33(29):2301399
Crystalline water-free β-phase Ca0.14V2O5 is reported for the first time as a viable cathode material for calcium-ion batteries (CIBs). In contrast to layered α-V2O5 and δ-CaxV2O5·nH2O, which have limited capacity, the β-phase delivers a reversible capacity of ≈247 mAh g−1, which corresponds to the insertion/extraction of Ca2+ between Ca0.14V2O5 and Ca1.0V2O5. The process of Ca2+ insertion process and the accompanying structural relaxation are theoretically and experimentally verified. The initial insertion of Ca2+ into Ca0.14V2O5 causes a slight shift of oxygen atoms surrounding hepta-coordination sites, creating penta-coordinated sites that are then partially filled up to Ca0.33V2O5. Further insertion occurs through the stepwise occupation of up to 50% of neighboring hexa- and tetra-coordination sites to form Ca0.67V2O5 and Ca1.0V2O5, respectively. The rearrangement of oxygen atoms in Ca0.14V2O5 also minimizes dimensional changes, leading to high cyclic stability during repeated charge/discharge cycles. The remarkable electrochemical performance of full cells containing a Ca0.14V2O5 cathode and a K metal anode in Ca2+/K+ hybrid electrolytes, is also demonstrated, thanks to the inertness of K+ insertion into Ca0.14V2O5 and the absence of calcium plating/stripping. The cyclic stability and high capacity of Ca0.14V2O5 is not compromised in hybrid electrolytes, making it a viable CIB cathode. 相似文献
332.
Jungwook Han Hansol Park Kyurin Park Sun-Young Kim Jae Yong Lee Chunseon Pyo 《野外机器人技术杂志》2023,40(8):1887-1905
This study introduces an advanced autonomous navigation algorithm for unmanned surface vehicle (USV) operations in complex coastal traffic areas. To facilitate the undertaking of tests for innovative technologies, the Korean government has designated regulation-free special zones, thereby enabling field tests for USV demonstrations without an onboard safety person on real manned-ship navigation routes. To enable real-world USV operation without onboard safety person, an existing autonomous navigation algorithm is extended to achieve sufficiently reliable and robust USV operation. Accordingly, berthing and unberthing algorithms are newly developed for unmanned operation, and enhanced situational awareness algorithms are applied to detect all types of obstacles, including small-sized floating objects spread over a wide range, such as a fish farm. In particular, the Korean intelligent maritime transportation service, called e-Navigation, is incorporated into the autonomous navigation algorithms to overcome the limitations of vehicle autonomy based on onboard sensors. To demonstrate the capability of fully unmanned operation in real marine traffic scenarios, long-distance navigation (54 km on a single voyage) was conducted by running several missions, including navigation in complex fish farm areas, maritime surveys, collision avoidance, navigation on real traffic routes, and emergency response. The extended navigation algorithms and results of the field tests are presented and discussed in this paper. 相似文献
333.
Heejun Yun Jinil Cho Seokgyu Ryu Seonmi Pyo Heebae Kim Jeewon Lee Byeongyun Min Yong Hyun Cho Harim Seo Jeeyoung Yoo Youn Sang Kim 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(22):2207223
Composite solid electrolytes (CSEs) are newly emerging components for all-solid-state Li-metal batteries owing to their excellent processability and compatibility with the electrodes. Moreover, the ionic conductivity of the CSEs is one order of magnitude higher than the solid polymer electrolytes (SPEs) by incorporation of inorganic fillers into SPEs. However, their advancement has come to a standstill owing to unclear Li-ion conduction mechanism and pathway. Herein, the dominating effect of the oxygen vacancy (Ovac) in the inorganic filler on the ionic conductivity of CSEs is demonstrated via Li-ion-conducting percolation network model. Based on density functional theory, indium tin oxide nanoparticles (ITO NPs) are selected as inorganic filler to determine the effect of Ovac on the ionic conductivity of the CSEs. Owing to the fast Li-ion conduction through the Ovac inducing percolation network on ITO NP–polymer interface, LiFePO4/CSE/Li cells using CSEs exhibit a remarkable capacity in long-term cycling (154 mAh g−1 at 0.5C after 700 cycles). Moreover, by modifying the Ovac concentration of ITO NPs via UV-ozone oxygen-vacancy modification, the ionic conductivity dependence of the CSEs on the surface Ovac from the inorganic filler is directly verified. 相似文献