Tin modification of sodium manganese hexacyanoferrate as a superior cathode material for sodium ion batteries
Tin modification of sodium manganese hexacyanoferrate as a superior cathode material for sodium ion batteries
复制标题
DOI：
10.1016/j.electacta.2020.135928
复制
发表时间：
2020-05-10
影响因子：
6.6
通讯作者：
Li, Jie
中科院分区：
文献类型：
--
作者：
Li, Jinke;He, Xin;Li, Jie
研究了普鲁士蓝类似物六氰合铁酸锰锡钠作为钠离子电池正极材料的性能。通过Sn ~（4+）的共沉淀，改性后的六氰合铁锰酸钠晶体在酵母上为空间群为Fm（3）的面心立方结构，而未改性的六氰合铁锰酸钠晶体在酵母上为空间群为R（3）的菱面体结构。与未改性的材料相比，改性的材料表现出更小的颗粒和更粗糙的表面，显示出改善的倍率性能和循环稳定性。经10%锡改性的材料在2 C（240 mA g（-1））下循环100次后保持80.5%的容量，并在20 C下提供53.4 mA h g（-1）。Fe和Mn都参与了氧化还原反应，并且对于原始样品和改性样品，在初始Na+提取和插入后，结构变化是可逆的。对于长期循环，改性的材料比原始材料经历更少的结构转变，这可能导致更好的结构稳定性，并且进一步导致增强的循环性能。(C)2020爱思唯尔有限公司保留所有权利。
Tin modified sodium manganese hexacyanoferrate, as a Prussian blue analogue, is studied as a cathode material for sodium ion batteries. By co-precipitation of Sn4+ during the synthesis process, the modified sodium manganese hexacyanoferrate materials crystallize with face-centered cubic structure with space group Fm (3) over barm, while the unmodified one possesses a rhombohedral structure with space group R (3) over barm. Compared to the unmodified material, the modified materials exhibit smaller particles with rougher surface, showing improved rate capability and cycling stability. The material modified by 10% Sn maintains 80.5% capacity after 100 cycles at 2 C (240 mA g(-1)) and delivers 53.4 mA h g(-1) at 20 C. Both Fe and Mn take part in the redox reaction and the structural changes are reversible upon the initial Na+ extraction and insertion for both pristine and modified samples. For long-term cycling, the modified materials undergo less structural transformation than the pristine material that may lead to a better structural stability, and furthermore to enhanced cycling performance. (C) 2020 Elsevier Ltd. All rights reserved.