【摘要】 以水热法合成的纳米MnO2为模板,合成了以棒状结构为组成单元的球状LiMn2O4纳米材料,并首次用FePO4对其进行了表面包覆改性。通过XRD、SEM、TEM、EDS等表征手段对材料的结构、形貌及组成元素进行了分析,并测试了材料的电化学性能。结果表明,经过1%(质量分数)FePO4包覆的LiMn2O4材料的电化学性能得到明显改善,在1C下首次放电比容量达128.6mAh/g,循环100次后仍保持97.3mAh/g,容量保持率为75.7%;在0.1C下充电,在0.1C、0.2C、0.5C、1C、2C、3C、4C下连续放电,放电比容量分别可达131.2mAh/g、128.0mAh/g、127.1mAh/g、126.0mAh/g、117.8mAh/g、110.9mAh/g和104.6mAh/g。更多还原

【Abstract】 Uniform LiMn2O4 spheres,consisting of nanorods,was prepared by nano-MnO2 template and modified by FePO4 coating.The obtained materials were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and energy dispersive spectrometry(EDS).Meanwhile,their electrochemical properties were characterized by electrochemical method.The results demonstrate that the LiMn2O4 coated with 1wt% FePO4 shows an initial discharge capacity of 128.6mAh/g at 1C,and still remains of 97.3mAh/g after 100 cycles.When discharged at 0.1C,0.2C,0.5C,1C,2C,3C and 4C,its discharge capacity could reach 131.2mAh/g,128.0mAh/g,127.1mAh/g,126.0mAh/g,117.8mAh/g,110.9mAh/g and 104.6mAh/g,respectively.It indicates that,compared with the parent,the electrochemical performance is significantly improved after modification.更多还原