High-performance NaFePO4 formed by aqueous ion-exchange and its mechanism for advanced sodium ion batteries
High-performance NaFePO4 formed by aqueous ion-exchange and its mechanism for advanced sodium ion batteries
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水性离子交换形成的高性能NaFePO4及其用于先进钠离子电池的机理
DOI：
10.1039/c6ta01111j
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发表时间：
2016-03
影响因子：
11.9
通讯作者：
Kian Ping Loh
中科院分区：
文献类型：
--
作者：
Wei Tang;Xiaohe Song;Yonghua Du;Chengxin Peng;Ming Lin;Shibo Xi;Bingbing Tian;Jiaxin Zheng;Yuping Wu;Feng Pan;Kian Ping Loh
室温钠离子电池（SIBs）作为锂离子电池（LIBs）的廉价替代品，在大型储能电站中具有潜在的应用前景，近年来引起了广泛的关注。在sib中使用的各种磷酸铁阴极中，橄榄石NaFePO4由于其电化学特性和高理论容量而成为最具吸引力的先进钠离子电池主体材料之一。为了替代有机基电化学离子交换工艺动力学缓慢和Li+共插层的缺点，我们研究了一种基于水的电化学驱动离子交换工艺，将橄榄石LiFePO4转化为高纯橄榄石NaFePO4，该工艺具有优异的电化学性能。通过从头计算和实验的结合，我们证明了这一机制归因于NaFePO4在水电解质/阴极界面上比有机电解质更快的Na+/Li+离子交换动力学。利用Operando Fe K-edge XANES和XRD研究了NaFePO4纳米颗粒在盐化/脱盐过程中相的阶段性演化。
Room-temperature sodium ion batteries (SIBs) have attracted tremendous attention recently as cheaper alternatives to lithium ion batteries (LIBs) for potential application in large-scale electrical energy storage stations. Among the various classes of iron phosphate cathodes used in SIBs, olivine NaFePO4 is one of the most attractive host materials for advanced sodium ion batteries owing to its electrochemical profile and high theoretical capacity. As an alternative to the organic-based electrochemical ion-exchange process which is disadvantaged by sluggish dynamics and co-intercalation of Li+, we investigated an aqueous-based, electrochemical-driven ion-exchange process to transform olivine LiFePO4 into highly pure olivine NaFePO4, which shows superior electrochemical performance. Using a combination of ab initio calculations and experiments, we demonstrate that the mechanism is attributed to the much faster Na+/Li+ ion-exchange kinetics of NaFePO4 at the aqueous electrolyte/cathode interface compared to the organic electrolytes. Operando Fe K-edge XANES and XRD were also carried out to study the staged evolution of phases during the sodiation/desodiation of NaFePO4 nanograins.
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影响因子：
10.8
作者：
Jiaxin Zheng;Yuyang Hou;Y. Duan;Xiaohe Song;Yi Wei;Tongchao Liu;Jiangtao Hu;H. Guo;Zengqing Zhuo-Z
通讯作者：
Jiaxin Zheng;Yuyang Hou;Y. Duan;Xiaohe Song;Yi Wei;Tongchao Liu;Jiangtao Hu;H. Guo;Zengqing Zhuo-Z
影响因子：
19
作者：
Kim, Heejin;Shakoor, R. A.;Choi, Jang Wook
通讯作者：
Choi, Jang Wook
三明治状分层多孔碳/石墨烯复合材料作为高性能钠离子电池负极材料
影响因子：
27.8
作者：
Yan, Yang;Yin, Ya-Xia;Wan, Li-Jun
通讯作者：
Wan, Li-Jun
影响因子：
9.2
作者：
M. Holzapfel;A. Würsig;W. Scheifele;J. Vetter;P. Novák
通讯作者：
M. Holzapfel;A. Würsig;W. Scheifele;J. Vetter;P. Novák
影响因子：
16.6
作者：
Hwang, Jang-Yeon;Oh, Seung-Min;Sun, Yang-Kook
通讯作者：
Sun, Yang-Kook