烧结工艺对Li_4Ti_5O_(12)改性材料电性能及综合性能影响

采用Mg~(2+)离子掺杂和碳包覆对Li_4Ti_5O_(12)(LTO)锂离子电池负极材料进行改性,研究了不同烧结温度对LTO导电性及综合性能的影响。采用XRD、SEM和循环伏安等测试手段,表征了不同掺杂和不同烧结温度对LTO结构和电化学性能的影响。结果表明:掺杂3%的Mg~(2+)同时加入质量分数为0.5%的无机碳源和10%的有机碳源时,材料在800℃下烧结12 h性能最佳;改性后明显降低了LTO的电荷转移阻抗,与纯相的LTO相比,改性后的材料倍率性能及其他综合性能都有很大的提高。0.2 C倍率条件下首次放电比容量为173 mAh/g,10 C倍率条件下放电比容量为104 mAh/g。

Effect of sintering process on electrical performance and comprehensive performance of Li4Ti5O12 modified material

Li4Ti5O12 (LTO) anode material were modified with Mg2+ ion doping and carbon coating,and the effects of different sintering temperatures on electrical performance and comprehensive performance were studied.Also,the effects of different doping and sintering temperature on the structure and electrochemical performance of LTO were researched by XRD,SEM and cyclic voltammetry.The results show that 3％ Mg2+ ion doping LTO with 0.5％ inorganic carbon coating and 10％ organic carbon coating,material sintered at 800 ℃ for 12 h possesses excellent performance.Compared with the performance of pure-phased LTO,the electrochemical properties of modifying anode material are improved significantly.The initial capacity of modified material is 173 mAh/g and 104 mAh/g at 0.2 C and 10 C,respectively.