Dual‐Graphene Rechargeable Sodium Battery |
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| Authors: | Faxing Wang Zaichun Liu Panpan Zhang Hongyan Li Wenbo Sheng Tao Zhang Rainer Jordan Yuping Wu Xiaodong Zhuang Xinliang Feng |
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| Affiliation: | 1. Center for Advancing Electronics Dresden (cfaed) & Department of Chemistry and Food Chemistry, Technische Universit?t Dresden, Dresden, Germany;2. School of Energy Science and Engineering, Nanjing Tech University, Nanjing, China;3. Chair of Macromolecular Chemistry, School of Science, Technische Universit?t Dresden, Dresden, Germany |
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| Abstract: | 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 (PF6?) 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?1. Notably, the dual‐graphene rechargeable Na microbattery exhibited an areal capacity of 35 μAh cm?2 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. |
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| Keywords: | anion intercalation electrochemically exfoliated graphene high voltage microbattery rechargeable battery |
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