The mechanism of NaFePO4 (de)sodiation determined by in situ X-ray diffraction

被引：106
作者：
Galceran, Montserrat [1 ]
Saurel, Damien [1 ]
Acebedo, Begona [1 ]
Roddatis, Vladimir V. [1 ]
Martin, Egoitz [1 ]
Rojo, Teofilo [1 ,2 ]
Casas-Cabanas, Montse [1 ]
机构：
[1] CIC ENERGIGUNE, ED CIC, Minano 01510, Spain
[2] Univ Pais Vasco UPV EHU, Dept Quim Inorgan, Bilbao 48080, Spain
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 19期
关键词：
SODIUM-ION BATTERIES; ELECTRODE MATERIALS; OLIVINE LIFEPO4; PHASE-STABILITY; SOLID-SOLUTION; NA; INSERTION; LITHIUM; ENERGY; FE;
D O I：
10.1039/c4cp01089b
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：
The reaction mechanism occurring during the (de)intercalation of sodium into the host olivine FePO4 structure is thoroughly analysed through a combination of structural and electrochemical methods. In situ XRD experiments have confirmed that the charge and discharge reaction mechanisms are different and have revealed the existence of a solid solution domain from 1 < x < 2/3 in NaxFePO4 upon charge. The second part of the charge proceeds through a 2-phase reaction between Na2/3FePO4 and FePO4 with strongly varying solubility limits. The strong cell mismatch between Na2/3FePO4 and FePO4 enhances the effects of the diffuse interface and therefore varying solubility limits are first observed here in micrometric materials.
引用
收藏
页码：8837 / 8842
页数：6
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