Open-framework iron(II) phosphate-oxalate as anode material for Li-ion batteries
- Resource Type
- Original Paper
- Authors
- Lu, Si-Tong; Li, Yan-Yan; Cai, Ya-Xuan; Zou, Guo-Dong; Fan, Yang
- Source
- Ionics: International Journal of IonicsThe Science and Technology of Ionic Motion. 29(11):4585-4592
- Subject
- Iron(II) phosphate-oxalate
Anode material
Conversion reaction
Li3PO4
Lithium-ion batteries
- Language
- English
- ISSN
- 0947-7047
1862-0760
The iron(II) phosphate-oxalate compound, namely (C4H12N2)[Fe4(HPO4)2(C2O4)3] (abbreviated as FPC), was synthesized and studied as anode material for lithium-ion batteries (LIBs). The structure of FPC was characterized by single-crystal X-ray diffraction. The FPC anode material gives a reversible capacity of 966.1 mAh g−1 after 400 cycles and good rate capability of 383.1 mAh g−1 at 2 A g−1. The lithium storage mechanism for FPC was analyzed. The results suggest that the electrochemical activity of FPC arises from the conversion reaction accompanied by the formation of Li3PO4 after lithiation. The in situ generation of ion conductive Li3PO4 and the redox process between FePO4 and Fe contribute to the good rate capability and cycling stability of the FPC anode.