材料科学
化学工程
锂(药物)
电化学
形态学(生物学)
扫描电子显微镜
粒子(生态学)
透射电子显微镜
粒径
离子
锂离子电池
纳米技术
电池(电)
电极
复合材料
化学
有机化学
内分泌学
工程类
物理化学
功率(物理)
海洋学
地质学
生物
医学
量子力学
遗传学
物理
作者
Xiaopeng Huang,Yaochun Yao,Feng Liang,Yongnian Dai
标识
DOI:10.1016/j.jallcom.2018.02.048
摘要
A study of the morphology-controlled growth of olivine LiFePO4 particles by varying the precursor concentration via a facile solvothermal synthesis was carried out. The influences of the solvent product on the structure, morphology and electrochemical performance were systematically investigated by X-ray diffraction, scanning/transmission electron microscopy and charge-discharge tests. It was found that as the precursor concentration increased from 0.15 M to 0.90 M, the morphology of the LiFePO4 particles changed from spindle-shape to plate-type and then to a hierarchical club-shaped structure, and the predominantly exposed facet of all LiFePO4 samples was (100). The shape of LiFePO4 particles remained as nanoplates while synthesized at different reaction temperatures and time with a precursor concentration of 0.30 M. This in turn confirms that the precursor concentration plays an important role in controlling the morphology of LiFePO4 particles. To illustrate the phenomenon caused by variations in the concentration, a possible morphological transformation mechanism was demonstrated. With the optimal precursor concentration of 0.3 M, the obtained LiFePO4 shows square nanoplates with uniform particle size and carbon coating, resulting in excellent electrochemical performance: a discharge capacity of 157.3 mAh/g at 1 C with 95% capacity retention after 1000 cycles and a high-rate capacity of 140.8 mAh/g at 10 C. This facile and precursor concentration-controlled solvothermal method is anticipated to be a guide for large-scale cathode material manufacturing and can fulfil the requirements for its application to high-power lithium-ion batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI