Fe and Co methylene diphosphonates as conversion materials for Li-ion batteries

JOURNAL OF POWER SOURCES

卷:342

Article

Schmidt, Sebastian¹  Sallard, Sebastien¹  Sheptyakov, Denis²  Nachtegaal, Maarten¹  Novak, Petr¹  Villevieille, Claire¹ 

[1] Paul Scherrer Inst, Energy & Environm Res ENE Div, CH-5232 Villigen, Switzerland

[2] Paul Scherrer Inst, Res Neutrons & Muons NUM Div, CH-5232 Villigen, Switzerland

关键词: Li-ion battery;    Organic-inorganic hybrid material;    Conversion material;    XAS;   

DOI  :  10.1016/j.jpowsour.2016.12.090

来源: Elsevier

【 摘 要 】

Organic-inorganic hybrid materials can introduce more flexibility in the choice of Li-ion battery materials due to the versatility of organic ligands. As an alternative to carboxylate-based ligands, Fe and Co methylene diphosphonate were successfully synthesised and tested as model diphosphonate-based negative electrode materials for Li-ion batteries, showing specific charges of 250 mAh g(-1) and 395 mAh g(-1) after 100 cycles at 50 mAh g(-1), respectively. Operando X-ray diffraction and ex situ X-ray absorption spectroscopy confirmed the expected conversion reaction mechanism involving amorphisation of the pristine materials and extrusion of transition metal particles upon reduction. Ex situ X-ray absorption spectra indicated that Fe methylene diphosphonate undergoes reversible Fe cycling between Fe(II) and Fe(0) metal particles. (C) 2017 Elsevier B.V. All rights reserved.

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