Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany.
Phys Chem Chem Phys. 2018 Dec 19;21(1):89-95. doi: 10.1039/c8cp06177g.
LiCo0.8Fe0.2MnO4 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.
LiCo0.8Fe0.2MnO4 已被研究作为锂离子电池（LIB）正极的活性材料，其放电电位约为 5 V（相对于 Li+|Li）。通过 Pechini 基溶胶-凝胶法合成后，通过 X 射线衍射、扫描电子显微镜、7Li MAS NMR 光谱和 57Fe Mössbauer 光谱研究了其结构和形态特性。通过恒电流循环，可以获得 117 mA h g-1 的比放电容量，这超过了理论容量的 80%。通过原位同步辐射粉末衍射研究了锂的提取/插入机制。通过原位 Mössbauer 光谱和原位 XAS 测量观察到 Fe3+到 Fe4+的可逆氧化过程。
