Li deinsertion mechanism and Jahn-Teller distortion in LiFe0.75Mn0.25PO4: an operando x-ray absorption spectroscopy investigation

被引：27
作者：
Iadecola, Antonella [1 ,2 ]
Perea, Alexis [3 ]
Aldon, Laurent [2 ,3 ]
Aquilanti, Giuliana [1 ]
Stievano, Lorenzo [2 ,3 ]
机构：
[1] Elettra Sincrotrone Trieste SCpA, Str Statale 14, I-34149 Trieste, Italy
[2] FR CNRS 3459, RS2E, 33 Rue St Leu, F-80039 Amiens, France
[3] Univ Montpellier, Inst Charles Gerhardt AIME, UMR CNRS 5253, Pl E Bataillon, F-34095 Montpellier 5, France
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2017年 / 50卷 / 14期
关键词：
Li-ion batteries; olivine structure; x-ray absorption spectroscopy; operando analysis; Jahn-Teller effect; MULTIVARIATE CURVE RESOLUTION; IN-SITU; ELECTRODE MATERIALS; PHOSPHO-OLIVINES; SOLID-SOLUTION; MCR-ALS; MOSSBAUER; LIFEPO4; DENSITY; LIMPO4;
D O I：
10.1088/1361-6463/aa605c
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The electrochemical lithiation of the mixed metal olivine LiFe0.75Mn0.25PO4 was followed by operando x-ray absorption spectroscopy (XAS) at both Fe and Mn K edges. XAS data were interpreted using an innovating chemometric approach, allowing the detailed reconstruction of the rather complicated reaction mechanism involving two different metal centres. In this way it was possible to precisely describe the Jahn-Teller effect occurring upon oxidation of the manganese centres. The thorough comprehension of the electrochemical mechanism is of high interest for studying the effect of lithium extraction in the olivine structure in the presence of Mn, which is known to partially hamper the complete lithiation of such mixed metal systems.
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页数：10
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