材料科学
阴极
电化学
普鲁士蓝
水溶液
锰
化学工程
电极
锌
无机化学
电流密度
离子
储能
冶金
电气工程
化学
有机化学
物理
工程类
物理化学
功率(物理)
量子力学
作者
Tong Cao,Fan Zhang,Mojing Chen,Tong Shao,Zhi Li,Qing Xu,DingXin Cheng,Haimei Liu,Yongyao Xia
标识
DOI:10.1021/acsami.1c04129
摘要
Aqueous zinc ion batteries (A-ZIBs) have been used as new alternative batteries for grid-scale electrochemical energy storage because of their low cost and environmental protection. Finding a suitable and economical cathode material, which is needed to achieve high energy density and long cycle stability, is one of the most important and arduous challenges at the present stage. Potassium manganese hexacyanoferrate (KMHCF) is a kind of Prussian blue analogue. It has the advantages of a large 3D frame structure that can accommodate the insertion/extraction of zinc ions, and is nontoxic, safe, and easy to prepare. However, regularly synthesized KMHCF has higher water and crystal defects, which reduce the possibility of zinc ions’ insertion/extraction, and subsequently the discharge capacity and cycling stability. In this work, a KMHCF material with less water and low defects was obtained by adding polyvinylpyrrolidone during the synthesis process to control the reaction process. The KMHCF serves as the cathode of A-ZIBs and exhibits an excellent electrochemical performance providing a specific capacity of 140 mA h g–1 for the initial cycle at a current density of 100 mA g–1 (1 C). In particular, it can maintain a reversible capacity of 85 mA h g–1, even after 400 cycles at 1 C. Moreover, unlike the traditional zinc storage mechanism of A-ZIBs, we found that the KMHCF electrode undergoes a phase transition process when the KMHCF electrode was activated by a small current density, which is attributed to part of the Mn on the lattice site being replaced by Zn, thus forming a new stable phase to participate in the subsequent electrochemical reaction.
科研通智能强力驱动
Strongly Powered by AbleSci AI