Abstract
LiFe x Mn1−x PO4/C composites were synthesized by a solid-state reaction route using phenolic resin as both reducing agent and carbon source. The effect of Fe doping on the crystallinity and electrochemical performance of LiFe x Mn1−x PO4/C was investigated. The experimental results show that the Fe2+ substitution for Mn2+ will lead to crystal lattice shrinkage of LiFe x Mn1−x PO4/C particles due to the smaller ionic radii of Fe2+. In the investigated Fe doping range (x = 0 to 0.7), LiFe x Mn1−x PO4/C (x = 0.4) composites exhibited a maximum discharge capacity of 148.8 mAh/g at 0.1 C while LiFe x Mn1−x PO4/C (x = 0.7) composite showed the best cycle capability with a capacity retention ratio of 99.0% after 30 cycles at 0.2 C. On the contrary, the LiFe x Mn1−x PO4/C (x = 0.5) composite performed better trade-off on discharge capacity and capacity retention ratio, 127.2 mAh/g and 94.7% after the first 30 cycles at 0.2 C, respectively, which is more preferred for practical applications.
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Funded by the Applied Basic Research Special Program of Guangzhou City (No.7411793079907), the Guangdong Province Science & Technology Bureau (Nos.2012B091100351, 2012B050300004) and the National Natural Science Foundation of China (No.21376035)
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Liu, X., Qin, X., Wang, X. et al. Synthesis and performance of LiFe x Mn1−x PO4/C as cathode material for lithium ion batteries. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 655–659 (2015). https://doi.org/10.1007/s11595-015-1206-6
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DOI: https://doi.org/10.1007/s11595-015-1206-6