Isovalent substitution of vanadium in LiFePO4: Evolution of monoclinic ?-Li3Fe2(PO4)3 phase

被引：5
作者：
Sundarayya, Y. [1 ]
Vijeth, H. [1 ]
Nagaraju, D. [2 ]
Swamy, K. C. Kumara [3 ]
Sunandana, C. S. [4 ]
机构：
[1] Nagaland Univ, Sch Sci, Dept Phys, Lumami 798627, Nagaland, India
[2] Vignans Fdn Sci Technol & Res VFSTR, Sch Appl Sci & Humanities, Dept Chem, Guntur 522213, Andhra Pradesh, India
[3] Univ Hyderabad, Sch Chem, Prof CR Rao Rd, Hyderabad 500046, India
[4] Univ Hyderabad, Sch Phys, Prof CR Rao Rd, Hyderabad 500046, India
来源：
INORGANIC CHEMISTRY COMMUNICATIONS | 2023年 / 150卷
关键词：
Vanadium substitution; Mo ?ssbauer spectroscopy; X-ray diffraction; Electron spin resonance; Infrared spectroscopy; LITHIUM IRON PHOSPHATE; ELECTROCHEMICAL PROPERTIES; MAGNETIC-PROPERTIES; STATE; LI3FE2(PO4)(3); TEMPERATURE; OLIVINES; CATHODE; IMPACT; LI;
D O I：
10.1016/j.inoche.2023.110530
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
We report the synthesis and characterization of isovalent substitution of vanadium at phosphorus site in orthorhombic lithium iron phosphate (LiFePO4) nanoparticles by non-aqueous sol-gel method. Detailed analysis of X-ray diffraction patterns reveals the evolution of monoclinic alpha-Li3Fe2(PO4)3 phase and its formation is favored for the vanadium content higher than 20%. A continuous increase in unit cell volume of LiFePO4 is observed with increase in vanadium content from x = 0.05 to 0.20, followed by rapid decrease above x = 0.20, due to the creation of a greater number of Li-ion vacancies. FTIR studies demonstrate that the wavenumbers of various absorption maxima and the covalency strength parameter do not show a variation with x, thus confirm the substitution of vanadium in the form of VO4. Our results through Mo center dot ssbauer and electron paramagnetic resonance spectroscopy unambiguously demonstrate the enhancement in the formation of alpha-Li3Fe2(PO4)3 phase for vanadium content higher than 20%.
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页数：6
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