1. Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3. Division of Energy and Environment, Engineering Laboratory for the Next Generation Power and Energy Storage Batteries, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;
4. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Sodium-ion batteries (NIBs) show great prospect on the energy storage applications benefiting from their low cost and the abundant Na resources despite the expected lower energy density compared with lithium-ion batteries (LIBs). To further enhance the competitive advantage, especially in energy density, developing the high-capacity carbon anode materials can be one of the effective approaches to realize this goal. Herein, we report a novel carbon anode made from charcoal with a high capacity of ∼400 mAh g−1, wherein about 85% (>330 mAh g−1) of its total capacity is derived from the long plateau region below ∼0.1 V, which differs from those of typical hard carbon materials (∼300 mAh g−1) in NIBs but is similar to the graphite anode in LIBs. When coupled with air-stable Na0.9Cu0.22Fe0.30Mn0.48O2 oxide cathode, a high-energy density of ∼240 Wh kg−1 is achieved with good rate capability and cycling stability. The discovery of this promising carbon anode is expected to further improve the energy density of NIBs towards large-scale electrical energy storage.
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