期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 19, 页码 8837-8842出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp01089b
关键词
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资金
- Basque Government through Etortek project energiGUNE'10
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.
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