Li Yue, Xiang Jia, Li Yahao, Zhang Lulu, Tao Huachao, Yang Xuelin
Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy, China Three Gorges University Yichang 443002 Hubei China
Analysis and Testing Center, China Three Gorges University Yichang 443002 China.
RSC Adv. 2024 Apr 5;14(16):11089-11097. doi: 10.1039/d4ra00333k. eCollection 2024 Apr 3.
Because traditional lithium-ion batteries have been unable to meet the energy density requirements of various emerging fields, lithium-metal batteries (LMBs), known for their high energy density, are considered promising next-generation energy storage batteries. However, a series of problems, including low coulombic efficiency and low safety caused by dendrites, limit the application of lithium metal batteries. Herein, fluoro-oxygen codoped graphene (FGO) was used to modify the copper current collector (FGO@Cu). FGO-coated current collector provides more even nucleation sites to reduce the local effective current density. FGO is partly reduced during cycling and helps form stable LiF-rich SEI. Moreover, graphene's oxygen and fluorine functional groups reconstruct the current density distribution, promoting uniform lithium plating. The FGO@Cu current collector demonstrates superior properties than commercial Cu foil. The FGO@Cu delivers a 97% high CE for over 250 cycles at 1 mA cm. The FGO@Cu symmetrical battery cycled at 1 mA cm for over 650 h. LiFePO fuel cell with a lithium-plated FGO@Cu collector as an anode exhibits superior cycling stability.
由于传统锂离子电池无法满足各种新兴领域的能量密度要求，以高能量密度著称的锂金属电池（LMBs）被认为是很有前景的下一代储能电池。然而，一系列问题，包括由枝晶导致的低库仑效率和低安全性，限制了锂金属电池的应用。在此，氟氧共掺杂石墨烯（FGO）被用于修饰铜集流体（FGO@Cu）。涂覆有FGO的集流体提供了更均匀的成核位点，以降低局部有效电流密度。FGO在循环过程中部分被还原，并有助于形成稳定的富含LiF的固体电解质界面（SEI）。此外，石墨烯的氧和氟官能团重构了电流密度分布，促进了均匀的锂镀层形成。FGO@Cu集流体表现出比商业铜箔更优异的性能。FGO@Cu在1 mA cm²下超过250次循环时具有97%的高库仑效率。FGO@Cu对称电池在1 mA cm²下循环超过650小时。以镀锂的FGO@Cu集流体作为阳极的磷酸铁锂燃料电池表现出优异的循环稳定性。
