Qi Yuruo, Lu Yaxiang, Ding Feixiang, Zhang Qiangqiang, Li Hong, Huang Xuejie, Chen Liquan, Hu Yong-Sheng
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.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2019 Mar 22;58(13):4361-4365. doi: 10.1002/anie.201900005. Epub 2019 Feb 27.
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 at 0.15C with an impressive initial Coulombic efficiency (ICE) of 80 %. When paired with the NaNi Fe Mn O 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.
钠离子电池（NIBs）碳负极的综合性能在很大程度上受到其较差的倍率性能和安全问题的限制。在此，通过在800 °C的低温下制备出一种以斜率为主的碳负极，该负极在0.15C下具有263 mA h g的高可逆容量，初始库仑效率（ICE）高达80 %。当与NaNiFeMnO正极配对时，在6C下的可逆容量仍为0.15C下的75 %，并且在3C下循环1000次后仍保留73 %的容量。钠存储性能的增强可归因于具有随机取向的短碳层的独特微观结构和相对较高的缺陷浓度。鉴于其稳健性，这种低温碳化策略也可应用于其他前驱体，并为设计具有高安全性、低成本、优异ICE和卓越倍率性能的以斜率为主的碳负极提供新机会。
