Fan Jinxin, Luo Yu, Jiang Keliang, Wang Cheng
Institute for New Energy Materials & Low-Carbon Technologies, School of Material Science and Engineering, Tianjin University of Technology Tianjin 300384 China
Weifang Institute for Product Quality Inspection Weifang Shandong 261000 China.
RSC Adv. 2020 Jan 20;10(6):3145-3152. doi: 10.1039/c9ra09481d. eCollection 2020 Jan 16.
Lithium metal (anode) has attracted significant attention for use in lithium-metal batteries due to its high energy density, but its practical application is still hindered by the dendrite growth during the battery charging process. Here, fibrous silica nanospheres were prepared a direct hydrothermal reaction and coated on a separator to form a composite electrode with lithium sheets. Upon using this composite electrode in a symmetrical cell, the charge and discharge curves became more stable and the overpotential was alleviated compared with that of the bare lithium metal electrode. Meanwhile, the coulombic efficiency obtained from the Li‖Cu cell remained above 95.9% after 200 cycles at 0.5 mA h cm. The validity of using this composite electrode in the Li‖LFP (LiFePO, lithium iron phosphate) cells was also evaluated. The results show that the composite electrode can help restrict the growth of lithium dendrites and the accumulation of dead lithium.
锂金属（阳极）因其高能量密度而在锂金属电池的应用中备受关注，但其实际应用仍受到电池充电过程中枝晶生长的阻碍。在此，通过直接水热反应制备了纤维状二氧化硅纳米球，并将其涂覆在隔膜上，与锂片形成复合电极。在对称电池中使用这种复合电极时，与裸锂金属电极相比，充放电曲线变得更加稳定，过电位得到缓解。同时，在0.5 mA h cm下循环200次后，Li‖Cu电池的库仑效率保持在95.9%以上。还评估了这种复合电极在Li‖LFP（磷酸铁锂）电池中使用的有效性。结果表明，复合电极有助于抑制锂枝晶的生长和死锂的积累。
