Slope‐Dominated Carbon Anode with High Specific Capacity and Superior Rate Capability for High Safety Na‐Ion Batteries. Issue 13 (27th February 2019)

• Record Type: Journal Article
• Authors: Qi, Yuruo; Lu, Yaxiang; Ding, Feixiang; Zhang, Qiangqiang; Li, Hong; Huang, Xuejie; Chen, Liquan; Hu, Yong‐Sheng
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 13(2019)
• Page Start: 4361
• Page End: 4365
• Publication Date: 2019-02-27
• Subjects: carbon anode -- high safety -- Na-ion batteries -- rate capability -- slope-dominated; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201900005
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The comprehensive performance of carbon anodes for Na‐ion batteries (NIBs) is largely restricted by their inferior rate capability and safety issues. Herein, a slope‐dominated carbon anode is achieved at a low temperature of 800 °C, which delivers a high reversible capacity of 263 mA h g −1 at 0.15C with an impressive initial Coulombic efficiency (ICE) of 80 %. When paired with the NaNi1/3 Fe1/3 Mn1/3 O2 cathode, the reversible capacity at 6C is still 75 % of that at 0.15C, and 73 % of the capacity is retained after 1000 cycles at 3C. The enhanced Na storage performance could be attributed to the unique microstructure with randomly oriented short carbon layers and the relatively higher defect concentration. Given its robustness, such a low‐temperature carbonization strategy could also be applicable to other precursors and provide a new opportunity to design slope‐dominated carbon anodes for high safety, low‐cost NIBs with excellent ICE and superior rate capability. Abstract : Positive energy : The slope‐dominated carbon anode produced by the inverse low‐temperature strategy shows great potential for low‐cost and high‐safety Na‐ion batteries in terms of high specific capacity, impressive ICE, superior rate capability, and long cycle stability, without any doping, nano‐sizing, or pore‐creating procedures.