Jiang Fuyi, Li Tianjiao, Ju Peng, Sun Jianchao, Liu Chuang, Li Yiwei, Sun Xueqin, Chen Chengcheng
School of Environment and Materials Engineering, Yantai University Yantai Shandong 264005 China
Key Laboratory of Marine Bioactive Substances and Analytical Technology, Marine Ecology Center, First Institute of Oceanography, Ministry of Natural Resources (MNR) Qingdao Shandong 266061 China.
Nanoscale Adv. 2019 Nov 18;1(12):4989-4994. doi: 10.1039/c9na00658c. eCollection 2019 Dec 3.
Metallic sodium, which has a suitable redox potential and high theoretical capacity, is regarded as an ideal anode material for rechargeable Na metal batteries. However, dendrite growth on sodium metal during cycling has seriously restricted its practical applications. Herein, we employed a low-cost and facile brushing method to fabricate a porous nano-SiO coating, which can induce a relatively uniform distribution of Na flux and suppress the growth of Na dendrites. The nano-SiO coating with high porosity can decrease the Na stripping/plating overpotential (<50 mV) over 400 cycles at 5 mA cm. Moreover, when coupled with a NaV(PO) (NVP) cathode, the Na with SiO coating (Na@SiO) composite anode shows a favorable suitability in a full cell. Compared with the one with a bare Na anode, the full cell with the Na@SiO anode delivers a 27.8% higher discharge capacity (94.6 74 mA h g at 1C) after 1000 cycles.
金属钠具有合适的氧化还原电位和较高的理论容量，被视为可充电钠金属电池的理想负极材料。然而，循环过程中钠金属上的枝晶生长严重限制了其实际应用。在此，我们采用一种低成本且简便的刷涂方法制备了一种多孔纳米SiO涂层，该涂层可诱导钠通量相对均匀分布并抑制钠枝晶的生长。具有高孔隙率的纳米SiO涂层在5 mA cm下经过400次循环可降低钠脱溶/沉积过电位（<50 mV）。此外，当与NaV(PO)（NVP）正极耦合时，具有SiO涂层的钠（Na@SiO）复合负极在全电池中表现出良好的适用性。与使用裸钠负极的全电池相比，使用Na@SiO负极的全电池在1000次循环后放电容量高出27.8%（在1C下为94.6 74 mA h g）。
