Ming Xiang-Lan, Wang Ruizi, Li Teng, Wu Xixi, Yuan Liang-Jie, Zhao Yu
College of Mechanical and Electrical Engineering, Lingnan Normal University, Zhanjiang 524048, P. R. China.
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China.
ACS Omega. 2021 Jul 16;6(29):18957-18963. doi: 10.1021/acsomega.1c02216. eCollection 2021 Jul 27.
The micro-nano-structured FePO·2HO was prepared from mixed solution of FeSO oxidized in diluted HPO with HO and NaOH solution in the turbulent flow cycle state at 90 °C. The resulting products were characterized by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Constant current charge/discharge tests were adopted to investigate the electrochemical performance and the rate capability (from 0.1C to 5C) of the carbon-coated LiFePO composite materials prepared from the micro-nano-structured FePO. The carbon-coated LiFePO composite materials deliver a high specific discharge capacity of 153.7 mAh·g, exhibit excellent cycle performance with 98.6% of the capacity retained after 30 cycles. This study demonstrates that the turbulent flow cycle method may be an economical and effective method for industrial production of fine and uniform micro-nano-structured FePO·2HO particles for LiFePO cathode materials for Li-ion batteries.
微纳米结构的FePO₄·2H₂O是在90℃的湍流循环状态下，由在稀H₃PO₄中用H₂O₂氧化的FeSO₄混合溶液与NaOH溶液制备而成。所得产物通过热重分析（TGA）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）进行表征。采用恒流充放电测试来研究由微纳米结构的FePO₄制备的碳包覆LiFePO₄复合材料的电化学性能和倍率性能（从0.1C到5C）。碳包覆LiFePO₄复合材料具有153.7 mAh·g的高比放电容量，表现出优异的循环性能，30次循环后容量保持率为98.6%。本研究表明，湍流循环法可能是一种经济有效的方法，用于工业生产用于锂离子电池LiFePO₄正极材料的精细且均匀的微纳米结构FePO₄·2H₂O颗粒。
