A Fully Sodiated NaVOPO4 with Layered Structure for High-Voltage and Long-Lifespan Sodium-Ion Batteries
Yongjin Fang, Qi Liu, Lifen Xiao, Yangchun Rong, Yadong Liu, Zhongxue Chen, Xinping Ai, Yuliang Cao, Hanxi Yang, Jian Xie, Chengjun Sun, Xiaoyi Zhang, Bachir Aoun, Xianran Xing, Xianghui Xiao, Yang Ren
Index: 10.1016/j.chempr.2018.03.006
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Abstract
Sodium-ion batteries are the primary candidate for a low-cost and resource-abundant alternative to lithium-ion batteries for large-scale electric storage applications. However, the development of sodium-ion batteries is hindered by the lack of suitable cathode materials that have sufficient specific energy density and cycle life. Here, we report layered NaVOPO4as a cathode material that exhibits high voltage (∼3.5 V versus Na/Na+), high discharge capacity (144 mAh g−1at 0.05 C), and remarkable cyclability with 67% capacity retention over 1,000 cycles. The excellent performances result from the high Na+ion diffusion rate in the two-dimensional path and the reversible transformation behavior of (de)sodiation. Particularly, this layered structure and its synthetic procedure can be extended to other alkali-metal intercalation materials, leading to other metal-ion battery systems, which opens a new avenue for large-scale energy storage systems with the development of high-energy-density and long-life cathodes for electric storage applications.