期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 962, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2023.171037
关键词
Nanocomposites; Defects; Transition metal oxides; Carbon
This study introduces one-pot-induced defective structures on CVO-PCNFs as the battery-type anodes of LICs, improving their Li-ion storage performance and ultrafast rate charge/discharge. The defective structures include oxygen vacancies in CVO crystals and mesopores in CNFs, which accelerate Li-ion and electron transport kinetics. The battery-type anode fabricated using CVO-PCNFs exhibits notable discharge capacity, cyclic stability, and ultrafast rate capability.
Lithium-ion capacitors (LICs) are promising energy storage devices that combine the advantages of their constituent electrodes (battery-type anode + capacitor-type cathode) but require performance optimization (e.g., enhancement of rate capability and energy density retention upon high-rate charge/discharge) to satisfy the demands of commercial applications. Herein, one-pot-induced defective structures are introduced on oxygendeficient cobalt vanadium (CVO) nano-planted mesoporous carbon nanofibers (CVO-PCNFs) as the batterytype anodes of LICs. The CVO nano-planted CNF construction involves CVO nanoparticles-embedded CNF framework with robust chemical linkages, which promote enhanced Li-ion storage and electrochemically reversible Li-ion transport. The defective structures include the simultaneous generation of oxygen vacancies in the CVO crystals and mesopores in the CNFs, which accelerate both Li-ion and electron transport kinetics at ultrafast-rate charge/discharge conditions. As a consequence of the synergistic effects, the battery-type anode fabricated using CVO-PCNFs as the active material exhibited a notable enhancement in discharge capacity (636.6 mAh/g), cyclic stability (capacity retention of 97.9 % after 100 cycles at 100 mA/g), and ultrafast rate capability (capacity retention of 89.5 % after 500 cycles at 2000 mA/g). Furthermore, the LIC full cell fabricated with a CVO-PCNF anode and an activated carbon cathode demonstrated a noteworthy ultrafast rate capability of 9.03 Wh/kg at a power density of 7927.3 W/kg.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据