Zhang Xianghua, Chen Haoliang, Liu Weiling, Xiao Ni, Zhang Qi, Rui Xianhong, Huang Shaoming
Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, P.R. China.
School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Chem Asian J. 2020 May 4;15(9):1430-1435. doi: 10.1002/asia.202000162. Epub 2020 Mar 30.
Aqueous zinc-ion batteries (ZIBs) have become the highest potential energy storage system for large-scale applications owing to the high specific capacity, good safety and low cost. In this work, a NASICON-type Na V (PO ) cathode modified by a uniform carbon layer (NVP/C) has been synthesized via a facile solid-state method and exhibited significantly improved electrochemical performance when working in an aqueous ZIB. Specifically, the NVP/C cathode shows an excellent rate capacity (e. g., 48 mAh g at 1.0 A g ). Good cycle stability is also achieved (e. g., showing a capacity retention of 88% after 2000 cycles at 1.0 A g ). Furthermore, the Zn (de)intercalation mechanism in the NVP cathode has been determined by various ex-situ techniques. In addition, a Zn||NVP/C pouch cell has been assembled, delivering a high capacity of 89 mAhg at 0.2 A g and exhibiting a superior long cycling stability.
水系锌离子电池（ZIBs）因其高比容量、良好的安全性和低成本，已成为大规模应用中最具潜力的储能系统。在这项工作中，通过简便的固态方法合成了一种由均匀碳层修饰的NASICON型NaV(PO) 正极（NVP/C），并且在水系锌离子电池中工作时表现出显著改善的电化学性能。具体而言，NVP/C正极显示出优异的倍率性能（例如，在1.0 A g 时为48 mAh g ）。还实现了良好的循环稳定性（例如，在1.0 A g 下循环2000次后容量保持率为88%）。此外，通过各种非原位技术确定了NVP正极中的锌嵌入/脱出机制。此外，组装了一个Zn||NVP/C软包电池，在0.2 A g 时具有89 mAhg 的高容量，并表现出优异的长循环稳定性。
