作　　者： ; ; ; ;

机构地区： 广东工业大学材料与能源学院

出　　处： 《人工晶体学报》 2012年第6期1686-1690,1695,共6页

摘　　要： 分别以柠檬酸、葡萄糖和蔗糖为碳源,采用球磨与碳热还原结合法制备了锂离子电池正极材料Li3V2(PO4)3/C。采用TG-DTA分析确定了合成过程的反应机理。通过XRD、SEM及恒电流充放电等测试研究了碳源对产物物理及电化学特性的影响。结果表明,碳源的选择对产物形貌和电化学性能影响较大。不同碳源制备的材料都具有单一相的Li3V2(PO4)3晶体结构,以柠檬酸为碳源制备的磷酸钒锂综合电化学性能较好,0.1 C和1 C条件下,首次放电容量分别为151.0 mAh·g-1和131.6 mAh.g-1,50次循环后容量保持率为95.0%和96.6%。 Cathode material Li3V2（PO4）3 for Lithium-ion battery was synthesized by combination of ball milling and carbothermal reduction,using citric acid,glucose and sucrose as carbon sources,respectively.The reaction mechanism of synthesis process was determined by TG-DTA analysis.Influences of different carbon sources on physical and electrochemical performances of as-prepared materials were also characterized through XRD,SEM and galvanostatic charge-discharge tests,etc.The results show that carbon sources had significant influences on morphology and electrochemical properties of Li3V2（PO4）3.All products had single phase crystal structures of Li3V2（PO4）3.With citric acid as carbon source,products had better electrochemical properties,the initial specific discharge capacities reached 153.0 mAh·g-1 and 130.6 mAh·g-1 at 0.1 C and 1 C rates,and capacity retentions were 95.0% and 96.63% after 50 cycles,respectively.

关 键 词： 锂离子电池 正极材料 磷酸钒锂 碳源

领　　域： [理学] [理学]