Impact of H2O exposure on the structure and electrochemical performance of LiVPO4F cathode material
作者： Peng Li , Rui Ma , Xiaoting Lin , Lianyi Shao , Kaiqiang Wu
DOI: 10.1016/J.JALLCOM.2015.02.200
关键词: Dissolution 、 Triclinic crystal system 、 Aqueous solution 、 Carbothermic reaction 、 Cathode material 、 Electrochemistry 、 Chemical engineering 、 Mineralogy 、 Morphology (linguistics) 、 Materials science 、 Degradation (geology)
摘要: Abstract In this work, triclinic structured LiVPO4F is prepared by a simple two-step carbothermal reduction method and subsequently exposed to water under different storage conditions. The impact of exposure on the structure, morphology electrochemical performance investigated in detail. It found that effect at room temperature (20 °C) slight. contrast, 80 °C has great structure properties LiVPO4F. Li, P V dissolution into aqueous solution results formation yellowish solution. Electrochemical tests show samples aged for 3 5 days poorer than pristine sample. 15 days exhibits higher initial reversible capacity compared with However, it deteriorates rapidly following cycles due moisture-sensitive surface, which induces thick Li2CO3/Li3PO4 film surface leads high charge transfer resistance degradation performance.
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