P3-type K0.33Co0.53Mn0.47O2·0.39H2O: a novel bifunctional electrode for Na-ion batteries

• Published in: Materials horizons Vol. 4; no. 6; pp. 1122 - 1127
• Main Authors: Wang, Sai, Sun, Tao, Yuan, Shuang, Yun-hai Zhu, Xin-bo, Zhang, Jun-min, Yan, Jiang, Qing
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 01.11.2017
• Subjects: Anodes; Cathodes; Discharge; Electric potential; Electrode materials; Electrodes; Flux density; Ion storage; Rechargeable batteries; Sodium-ion batteries; Sol-gel processes
• DOI: 10.1039/c7mh00512a
• ISSN: 2051-6347

A novel electrode material, P3-type K0.33Co0.53Mn0.47O2·0.39H2O (KCM), is synthesized through an easily-operated sol–gel method and it delivers considerable Na ion storage abilities when employed as both a cathode and an anode in NIBs. As a cathode, the compound displays remarkable average voltage potentials (over 3 V) and a high discharge capacity (114 mA h g−1 at 100 mA g−1). As an anode, a safe and ideal average voltage potential (0.53 V), a high discharge capacity (174 mA h g−1), and a long cycle life (950 cycles at 500 mA g−1) are also delivered together. In addition, a KCM-based full cell is subsequently built and even without any optimization it can still exhibit a high energy density (91 W h kg−1) accompanied by a long cycle performance (100 cycles at 100 mA g−1).