【摘要】 采用喷雾干燥与高温煅烧相结合的方法制备了球形LiTi₂（PO₄）₃/C复合水系负极材料,探讨了基于不同包覆机制的有机碳源和碳包覆量对LiTi₂（PO₄）₃/C复合负极电化学性能的影响.结果表明,碳包覆量过低时不足以阻止水的侵蚀,而碳含量过高时锂离子扩散的阻力过大,磷酸钛锂电极最优碳包覆质量分数为13%.碳包覆的均匀性和包覆层厚度是影响电极性能的两个重要因素.基于原位聚合包覆机制的聚多巴胺包覆磷酸钛锂颗粒最均匀,碳化后微晶结构较好,具有良好的电子导电性,以聚多巴胺为碳源制备的LiTi₂（PO₄）₃/C复合负极性能最优.更多还原

【Abstract】 Spherical LiTi₂（ PO₄）₃/C composites were prepared through spray drying method followed by hightemperature calcination and used as anodes for aqueous lithium ion batteries. The effect of different organic carbon source based on different coating mechanisms and carbon content on the electrochemical properties of LiTi₂（ PO₄）₃/C composite anodes were investigated. Results show that if the amount of carbon coating is too low,it cannot prevent water from eroding. In contrast,if the amount of carbon coating is too high,the resistance of lithium ion diffusion will be high. So the optimal carbon coating amount of LiTi₂（ PO₄）₃/C electrodes is 13%. The uniformity of carbon coating and the thickness of coating layer are the two main factors affecting the performance of coated electrodes. The polydopamine-coated lithium titanium phosphate particles based on the in-situ polymerization coating mechanism are the most uniform,and the microcrystalline structure and electronic conductivity after carbonization is better. The best performance is achieved by LiTi₂（ PO₄）₃/C anodes prepared by using polydopamine as the carbon source.更多还原