Preparation of synthetic rutile and metal-doped LiFePO4 from ilmenite
2010; Elsevier BV; Volume: 199; Issue: 3 Linguagem: Inglês
10.1016/j.powtec.2010.01.018
ISSN1873-328X
AutoresLing Wu, Xinhai Li, Zhixing Wang, Xiaojuan Wang, Lingjun Li, Jie Fang, Feixiang Wu, Huajun Guo,
Tópico(s)Advanced Battery Materials and Technologies
ResumoThe synthetic rutile and metal-doped LiFePO4 are prepared from the high-titanium residue and iron-rich lixivium, which are obtained from the ilmenite by a mechanical activation and leaching process. ICP results show that the rutile contains 92.01% TiO2, 1.59% Fe2O3, 0.034% MnO2 and 0.60% (MgO + CaO), which meet the requirement of the titanium dioxide chlorination process. The results also reveal that small amounts of Al3+, Ca2+ and Ti4+ precipitate in the FePO4·xH2O precursor. XRD and Rietveld-refine results show that the metal-doped LiFePO4 is single olivine-type phase and well crystallized, and Ti4+ occupy M1 site, Ca2+ occupy M2 site and Al3+ occupy both sites, which indicates the formation of cation-deficient solid solution. The sample exhibits a capacity of 123 mAh g−1 at 5C rate, and retains 94.3% of the capacity after 100 cycles.
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