Electrochemical lithium ion intercalation in Li_0.5Ni_0.25TiOPO₄ examined by in situ X-ray diffraction

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• 作者：Rickard Eriksson ; Kenza Maher ; Ismael Saadoune ; Mohammed Mansori ; Torbj?rn Gustafsson ; Kristina Edstr?m
• 关键词：Batteries ; Lithium intercalation compounds ; In situ X-ray powder diffraction
• 刊名：Solid State Ionics
• 出版年：2012
• 出版时间：4 October, 2012
• 年：2012
• 卷：225
• 期：Complete
• 页码：547-550
• 全文大小：514 K

文摘

The complex structural transformations of Li_0.5Ni_0.25TiOPO₄ during electrochemical lithiation have been examined by in situ X-ray diffraction. During the first lithiation two structural changes take place: first a transition to a second monoclinic phase (a = 9.085(4), b = 8.414(5), c = 6.886(5), ¦Â = 99.85(4)) and secondly a transition to a third phase with limited long-range order. The third phase is held together by a network of corner sharing Ti-O octahedra and phosphate ions with disordered Ni-Li channels. During delithiation the third phase is partially transformed back to a slightly disordered original phase, Li_0.5Ni_0.25TiOPO₄ without formation of the second intermediate phase. These phase transitions correspond well to the different voltage plateaus that this material shows during electrochemical cycling.