High-temperature treatment induced carbon anode with ultrahigh Na storage capacity at low-voltage plateau

作     者：Chenglong Zhao Qidi Wang Yaxiang Lu Baohua Li Liquan Chen Yong-Sheng Hu 

作者机构：Key Laboratory for Renewable EnergyBeijing 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 School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Division of Energy and Environment Engineering Laboratory for the Next Generation Power and Energy Storage Batteries Graduate School at Shenzhen Tsinghua Universty Shenzhen 518055 Chino School of Materials Science and Engineering Tsinghua University Beijing 100084 China 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2018年第63卷第17期

页      面：1125-1129页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Key Technologies R&D Program(2016YFB0901500) National Natural Science Foundation of China(51725206,51421002,51232005,and 51372131) 

主　　题：碳阳极材料 存储能力 高原 Na 低电压 高温度 cyclin 钠离子电池 

摘      要：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 m Ah 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 m Ah g^(-1)) in NIBs but is similar to the graphite anode in LIBs. When coupled with air-stable Na_(0.9)Cu_(0.22)e_(0.30)Mn_(0.48)O_2 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.