A Ni-doping-induced phase transition and electron evolution in cobalt hexacyanoferrate as a stable cathode for sodium-ion batteries

被引:26
作者
Quan, Junjie [1 ,2 ]
Xu, Enze [1 ,2 ]
Zhu, Hanwen [1 ,2 ]
Chang, Yajing [3 ]
Zhu, Yi [1 ,2 ]
Li, Pengcheng [1 ,2 ]
Sun, Zhenjie [1 ,2 ]
Yu, Dabin [3 ]
Jiang, Yang [1 ,2 ]
机构
[1] Sch Mat Sci & Engn, Hefei 230009, Peoples R China
[2] Hefei Univ Technol, Hefei 230009, Peoples R China
[3] Natl Univ Def Technol, State Key Lab Pulsed Power Laser Technol, Hefei 230037, Peoples R China
基金
中国国家自然科学基金;
关键词
PRUSSIAN BLUE ANALOGS; NICKEL HEXACYANOFERRATE; SUPERIOR CATHODE; AQUEOUS SODIUM; HIGH-CAPACITY; PERFORMANCE;
D O I
10.1039/d0cp05665k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Prussian blue analogues are potential competitive energy storage materials due to their diverse metal combinations and wide three-dimensional ion channels. Here, we prepared a new highly crystalline monoclinic nickel-doped cobalt hexacyanoferrate via a feasible and simple one-step co-precipitation method. In the process of sodium-ion de-intercalation, three stable charge and discharge platforms, which are consistent with the cyclic voltammetry performance, are seen for the first time, showing the function of nickel ions in Prussian blue. Furthermore, the charge transfer and structural evolution caused by the transmission of sodium ions were well revealed via ex situ XRD, ex situ XPS, and in situ EIS studies. Simulation calculations are performed relating to the energy band structure and the highest-occupied bonding orbitals of the system in different charge states, revealing the charge and discharge mechanism of the nickel-doped material and the reason for the emergence of the new platform at low voltages. In addition, NaNi0.17Co0.83Fe(CN)(6) also delivers a striking capacity of 146 mA h g(-1) and superior cyclability, with 93% capacity retention over 100 cycles; it can be considered as a promising alternative cathode material for use in sodium-ion batteries.
引用
收藏
页码:2491 / 2499
页数:9
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