Excellent temperature performance of spherical LiFePO4/C composites modified with composite carbon and metal oxides

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Abstract

Nanosized spherical LiFePO 4 /C composite was synthesized from nanosized spherical FePO 4 ·2H 2 O, Li 2 C 2 O 4 , aluminum oxide, titanium oxide, oxalic acid, and sucrose by binary sintering process. The phases and morphologies of LiFePO 4 /C were characterized using SEM, TEM, CV, EIS, EDS, and EDX as well as charging and discharging measurements. The results showed that the as-prepared LiFePO 4 /C composite with good conductive webs from nanosized spherical FePO 4 ·2H 2 O exhibits excellent electrochemical performances, delivering an initial discharge capacity of 161.7 mAh·g −1 at a 0.1 C rate, 152.4 mAh·g −1 at a 1 C rate and 131.7 mAh·g −1 at a 5 C rate, and the capacity retention of 99.1%, 98.7%, and 95.8%, respectively, after 50 cycles. Meanwhile, the high and low temperature performance is excellent for 18650 battery, maintaining capacity retention of 101.7%, 95.0%, 88.3%, and 79.3% at 55°C, 0°C, −10°C, and −20°C by comparison withthat of room temperature (25°C) at the 0.5 C rate over a voltage range of 2.2 V to 3.6 V, respectively.

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Zhang, B., Zeng, T., Zhang, J., Peng, C., Zheng, J., & Chen, G. (2014). Excellent temperature performance of spherical LiFePO4/C composites modified with composite carbon and metal oxides. The Scientific World Journal, 2014. https://doi.org/10.1155/2014/364327

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