期刊
CHEMICAL ENGINEERING JOURNAL
卷 431, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133906
关键词
Cobalt quantum dots; Nucleation site; Li deposition; Highly reversible; Glass-fiber-based lithium anode
资金
- Projects of National Natural Science Foundation of China [U1805254, U1705255, 21773192, 22072117, 22179112]
This study explores a unique glass fiber-based lithium anode and demonstrates its high reversibility and stability, as well as its dendrite-free structure, which can maintain high energy efficiency during long-term use.
Nonconducting textile materials will be the skeleton of electrode for flexible battery in growing widespread applications in portable and wearable electronics, a fiber-based lithium anode is facing more challenges and has more important sense. Herein, a glass fiber was employed as supporting skeleton on which the nitrogen-doped carbon nanoflake array has been modified first to form a conductive layer, then the cobalt quantum dots were embedded in the layer to establish lithophilic sites, finally, a unique glass-fiber-based lithium anode (GFLA) has been achieved. Furthermore, the cross-linked fiber framework not only dramatically lessen the local current density, but the richer cavity also greatly alleviates the volume expansion problem. Thus, the GFLA electrode demonstrated a highly reversible and stable long-term cycling behavior with nondendritic. As expected, the GFLA electrode exhibits a high CE (similar to 98.64%) at 0.5 mA cm(-2) upon 1480 h in half-cell and a durable cycling with a small voltage hysteresis (20 mV) for 470 h at 4 mA cm(-2)/4 mAh cm(-2) in symmetrical-cell. Moreover, the GFLA@Li||LiFePO4 full-cell displays a capacity retention rate of up to 90.3% after 400 cycles, while the carbon fiber@Li||LiFePO4 is only 36.4%.
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