材料科学
锂(药物)
X射线光电子能谱
电化学
兴奋剂
离子
锰
扫描电子显微镜
电化学动力学
磷酸钒锂电池
锂离子电池
磷酸铁锂
分析化学(期刊)
电池(电)
化学工程
电极
光电子学
物理化学
冶金
复合材料
化学
内分泌学
医学
功率(物理)
量子力学
有机化学
色谱法
工程类
物理
作者
Qiao-Ying Huang,Zhi Gang Wu,Jing Su,Yunfei Long,Xiaoyan Lv,Yanxuan Wen
标识
DOI:10.1016/j.ceramint.2016.04.057
摘要
LiMnPO4/C, LiMn0.85Fe0.15PO4/C, LiMn0.92Ti0.08PO4/C and Li(Mn0.85Fe0.15)0.92Ti0.08PO4/C are prepared by a solid-state reaction route and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and electrochemical tests. All samples are single phase with similar morphologies, particle sizes and carbon contents. Ti4+ and Fe2+ co-doping at the Mn-site greatly enhances the performance of LiMnPO4/C due to the synergistic effect between Ti4+ and Fe2+, resulting in an improvement in the dynamic stability of the olivine structure, lithium ion diffusion and electrochemical kinetics. Compared with LiMn0.85Fe0.15PO4/C and LiMn0.92Ti0.08PO4/C, Li(Mn0.85Fe0.15)0.92Ti0.08PO4/C shows a much higher discharge capacity and a better rate capability. It delivers a capacity of 144.4 mA h g−1 with a capacity retention ratio of approximately 100% after 50 cycles at 1 C. These results prove that Fe2+ and aliovalent ion co-doping at the Mn site is an effective way to improve the electrochemical properties of lithium manganese phosphate.
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