Li4Ti5O12/(Ag+C)电极材料的固相合成及电化学性能

以Li₂CO₃，TiO₂为原料，葡萄糖为碳源，采用固相煅烧工艺合成了亚微米级的Li₄Ti₅O₁₂/C复合负极材料。并将之与AgNO₃复合，采用固相方法制备出了Ag表面修饰的Li₄Ti₅O₁₂/(Ag+C)复合材料。采用XRD、SEM和TEM测试方法对材料的微结构进行了表征。结果表明，C的存在对Ag单质在Li₄Ti₅O₁₂/C颗粒表面的大量形成起到了积极的促进作用，从而很大程度地提高了Li₄Ti₅O₁₂/C的电导率，因此有效地改善了其电化学性能。在1C倍率下，Li₄Ti₅O₁₂/(Ag+C)复合材料的首次放电容量达到了164 mAh·g^-1。

Solid-State Synthesis and Electrochemical Performance of Li4Ti5O12/(Ag+C) Electrode Material

Li₄Ti₅O₁₂/C composite anode with a sub-micron size was synthesized via one-step calcination reaction using Li₂CO₃ and TiO₂ as the starting materials and glucose as the carbon source. Li₄Ti₅O₁₂/(Ag+C) composite was prepared by heating Li₄Ti₅O₁₂/C with AgNO₃. Microstructures of the materials were characterized by XRD, SEM and TEM techniques. It is found that the existence of C facilitates the formation of Ag on the surface of the Li₄Ti₅O₁₂/C particle, causing the enhancement of its electronic conductivity. As a result, the electrochemical performance of Li₄Ti₅O₁₂/C was improved. The Li₄Ti₅O₁₂/(Ag+C) composite shows a high initial discharge capacity of 164 mAh·g^-1 at 1C rate.