Hierarchical Hollow Prussian Blue Rods Synthesized via Self‐Sacrifice Template as Cathode for High Performance Sodium Ion Battery,Small Methods

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Hierarchical Hollow Prussian Blue Rods Synthesized via Self‐Sacrifice Template as Cathode for High Performance Sodium Ion Battery
Small Methods ( IF 10.7 ) Pub Date : 2018-09-14 , DOI: 10.1002/smtd.201800259
Fan Feng ₁ , Suli Chen ₁ , Xiao‐Zhen Liao ₁ , Zi‐Feng Ma ₁

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In this work, a facile strategy is proposed to synthesize hierarchical hollow rod‐like Mn‐doped Prussian blue (R‐PB) using MnO₂ nanosheets as a self‐sacrifice template. The as prepared R‐PB with low contents of vacancies and coordinated water, and high content of sodium, exhibits appealing electrochemical performance as a cathode for sodium ion batteries (SIBs) achieving a high discharge capacity of 117.3 mAh g⁻¹ and a capacity retention of 98.5% after 200 cycles at 1 C. Moreover, the specific capacity reaches 111.5 mAh g⁻¹ at 5 C with a Coulombic efficiency (CE) of 93.8%. The high capacity, superior cycling stability, and enhanced kinetics of Na⁺ migration of R‐PB are attributed to the positive effect of doped Mn ions and the hierarchical hollow rod‐like structure. The doped Mn ions in R‐PB activate the redox of Fe^LS(C) in the high voltage region to reach a high capacity. The unique hierarchical hollow rod‐like structure provides a buffer space for the volume change during the insertion/extraction of sodium ions, enlarges the contact area between the electrode materials and electrolyte, and enhances the apparent diffusion coefficient of sodium ions in electrode materials.

中文翻译：

通过自牺牲模板合成的空心空心普鲁士蓝棒作为高性能钠离子电池的阴极

在这项工作中，提出了一种简便的策略，以MnO ₂纳米片作为自我牺牲模板来合成分层的空心棒状Mn掺杂的普鲁士蓝（R-PB）。所制备的R-PB具有低的空位和配位水含量，以及高的钠含量，作为钠离子电池（SIB）的阴极具有吸引人的电化学性能，可实现117.3 mAh g ^-1的高放电容量并保持容量在1 C下进行200次循环后，其电量为98.5％。此外，在5 C下，比容量达到111.5 mAh g ^-1，库仑效率（CE）为93.8％。高容量，优异的循环稳定性和增强的Na ⁺动力学R‐PB的迁移归因于掺杂的Mn离子的积极作用和分层的空心杆状结构。R‐PB中掺杂的Mn离子激活高压区域中Fe ^LS（C）的氧化还原，以达到高容量。独特的分层空心杆状结构为钠离子的插入/提取过程中的体积变化提供了缓冲空间，扩大了电极材料与电解质之间的接触面积，并增强了钠离子在电极材料中的表观扩散系数。

更新日期：2018-09-14

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