Observation of electrochemically active Fe3+/Fe4+ in LiCo0.8Fe0.2MnO4 by in situ Mössbauer spectroscopy and X-ray absorption spectroscopy†,Physical Chemistry Chemical Physics

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Observation of electrochemically active Fe3+/Fe4+ in LiCo0.8Fe0.2MnO4 by in situ Mössbauer spectroscopy and X-ray absorption spectroscopy†
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-11-26 00:00:00 , DOI: 10.1039/c8cp06177g
Christoph Dräger _{1,

2,

3} , Florian Sigel _{1,

2,

3} , Ralf Witte _{2,

3,

4} , Robert Kruk _{2,

3,

4} , Lukas Pfaffmann _{1,

2,

3} , Stefan Mangold _{2,

3,

5} , Valeriu Mereacre _{1,

2,

3} , Michael Knapp _{1,

2,

3,

6,

7} , Helmut Ehrenberg _{1,

2,

3,

6,

7} , Sylvio Indris _{1,

2,

3,

6,

7}

Affiliation

LiCo_0.8Fe_0.2MnO₄ has been investigated as an active material for the positive electrode in lithium-ion batteries (LIBs) with a discharge potential of around 5 V (vs. Li⁺|Li). After synthesis by a Pechini based sol–gel route, the structural and morphological properties have been investigated by X-ray diffraction, scanning electron microscopy, ⁷Li MAS NMR spectroscopy, and ⁵⁷Fe Mössbauer spectroscopy. With galvanostatic cycling, it was possible to obtain a specific discharge capacity of 117 mA h g⁻¹, which is more than 80% of the theoretical capacity. The lithium extraction/insertion mechanism has been characterized by in situ synchrotron powder diffraction. The reversible oxidation process of Fe³⁺ to Fe⁴⁺ has been observed by in situ Mössbauer spectroscopy and in situ XAS measurements.

中文翻译：

电化学活性的Fe观察³⁺ / Fe的⁴⁺在的LiCo _0.8铁_0.2的MnO ₄通过原位穆斯堡尔光谱和X射线吸收光谱†

已经研究了LiCo _0.8 Fe _0.2 MnO ₄作为锂离子电池（LIBs）中正极的活性材料，其放电电势约为5 V（相对于Li ⁺ | Li）。通过基于Pechini的溶胶-凝胶路线进行合成后，已通过X射线衍射，扫描电子显微镜，⁷ Li MAS NMR光谱和⁵⁷ FeMössbauer光谱研究了结构和形态特性。通过恒电流循环，有可能获得117 mA hg ^-1的比放电容量，该容量大于理论容量的80％。锂的提取/插入机理的特点是原位同步加速器粉末衍射。已通过原位Mössbauer光谱和原位XAS测量观察到了Fe ³⁺可逆氧化为Fe ^4+的过程。

更新日期：2018-11-26

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