摘要
采用高温固相法分别制备Li Mn_2O_4和Li_(1.3)Al_(0.3)Ti_(1.7)(P O_4)_3材料,分别以质量比8∶2和6∶4不同比例复合做正极材料,利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)进行表征测试,恒流充放电、循环伏安法和电化学工作站研究其电化学性能,综合研究材料的性能。结果表明:质量比8∶2的样品颗粒分布比较均匀,边界清晰。通过电化学性能测试得出8∶2的样品首次冲放电效率可达到93.58%,纯的Li Mn_2O_4电极中样品的氧化还原峰更尖锐,电极反应速率快,氧化还原性能更好,纯的Li Mn_2O_4在0.1 C下循环50次后比容量保持率为90.3%。
The spinel lithium manganese oxide(LiMn2 O4) and Li1.3 Al0.3 Ti1.7(PO4)3 materials were synthesized by high temperature solid phase method respectively. The positive electrode materials were prepared by different 8∶2 and6∶4 mass ratios. The samples were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM), constant current charge and discharge, cyclic voltammetry and electrochemical workstations to study their electrochemical properties and to comprehensively study the properties of materials. The results indicate that the distribution of 8∶2 particles is uniform and the boundary is clear. The redox peak of pure LiMn2 O4 electrode is sharper, the electrode reaction rate is faster, the redox performance is better, and the specific capacity retention rate of the pure LiMn2 O4 is 90.3% at 0.1 C after 50 cycles.
引文
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