期刊
CHINESE CHEMICAL LETTERS
卷 31, 期 9, 页码 2225-2229出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2019.11.015
关键词
Carbon-coated; Li3VO4; Lithium-ion capacitors; Anode material; Capacity matching
资金
- National Natural Science Foundation of China [51677182, 51822706]
- DNL Cooperation Fund [DNL201915]
- Beijing Municipal Science and Technology Commission [Z181100000118006]
- Beijing Nova Program [Z171100001117073]
Due to the high capacity, moderate voltage platform, and stable structure, Li3VO4 (LVO) has attracted close attention as feasible anode material for lithium-ion capacitor. However, the intrinsic low electronic conductivity and sluggish kinetics of the Li+ insertion process severely impede its practical application in lithium-ion capacitors (LICs). Herein, a carbon-coated Li3VO4 (LVO/C) hierarchical structure was prepared by a facial one-step solid-state method. The synthesized LVO/C composite delivers an impressive capacity of 435 mAh/g at 0.07 A/g, remarkable rate capability, and nearly 100% capacity retention after 500 cycles at 0.5 A/g. The superior electrochemical properties of LVO/C composite materials are attributed to the improved conductivity of electron and stable carbon/LVO composite structures. Besides, the LIC device based on activated carbon (AC) cathode and optimal LVO/C as anode reveals a maximum energy density of 110 Wh/kg and long-term cycle life. These results provide a potential way for assembling the advanced hybrid lithium-ion capacitors. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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