Wang Faxing, Liu Zaichun, Zhang Panpan, Li Hongyan, Sheng Wenbo, Zhang Tao, Jordan Rainer, Wu Yuping, Zhuang Xiaodong, Feng Xinliang
Center for Advancing Electronics Dresden (cfaed) & Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany.
School of Energy Science and Engineering, Nanjing Tech University, 211816, Nanjing, China.
Small. 2017 Dec;13(47). doi: 10.1002/smll.201702449. Epub 2017 Oct 27.
Sodium (Na) ion batteries are attracting increasing attention for use in various electrical applications. However, the electrochemical behaviors, particularly the working voltages, of Na ion batteries are substantially lower than those of lithium (Li) ion batteries. Worse, the state-of-the-art Na ion battery cannot meet the demand of miniaturized in modern electronics. Here, we demonstrate that electrochemically exfoliated graphene (EG) nanosheets can reversibly store (PF ) anions, yielding high charging and discharging voltages of 4.7 and 4.3 V vs. Na /Na, respectively. The dual-graphene rechargeable Na battery fabricated using EG as both the positive and negative electrodes provided the highest operating voltage among all Na ion full cells reported to date, together with a maximum energy density of 250 Wh kg . Notably, the dual-graphene rechargeable Na microbattery exhibited an areal capacity of 35 μAh cm with stable cycling behavior. This study offers an efficient option for the development of novel rechargeable microbatteries with ultra-high operating voltage and high energy density.
钠离子（Na）电池在各种电气应用中的使用正受到越来越多的关注。然而，钠离子电池的电化学行为，特别是工作电压，远低于锂离子（Li）电池。更糟糕的是，最先进的钠离子电池无法满足现代电子产品小型化的需求。在此，我们证明了电化学剥离的石墨烯（EG）纳米片可以可逆地存储（PF）阴离子，相对于Na⁺/Na，充电和放电电压分别高达4.7 V和4.3 V。使用EG作为正负极制造的双石墨烯可充电钠电池在迄今为止报道的所有钠离子全电池中提供了最高的工作电压，以及250 Wh kg⁻¹的最大能量密度。值得注意的是，双石墨烯可充电钠微电池表现出35 μAh cm⁻²的面积容量和稳定的循环性能。这项研究为开发具有超高工作电压和高能量密度的新型可充电微电池提供了一个有效的选择。
