CAJ | 학술논문

以Li_2CO_3,TiO_2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Li_4Ti_5O_(12)/C复合负极材料.并将之与AgNO_3复合,采用固相方法制备出了Ag表面修饰的Li_4Ti_5O_(12)(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Li_4Ti_5O_(12)/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Li_4Ti_5O_(12)/C的电导率,因此有效地改善了其电化学性能.在1C倍率下,Li_4Ti_5O_(12)/(Ag+C)复合材料的首次放电容量达到了164 mAh·g(-1).
이Li_2CO_3,TiO_2위원료,포도당위탄원,채용고상단소공예합성료아미미급적Li_4Ti_5O_(12)/C복합부겁재료.병장지여AgNO_3복합,채용고상방법제비출료Ag표면수식적Li_4Ti_5O_(12)(AG+C)복합재료.채용XRD、SEM화TEM측시방법대재료적미결구진행료표정.결과표명,C적존재대Ag단질재Li_4Ti_5O_(12)/C과립표면적대량형성기도료적겁적촉진작용.종이흔대정도지제고료Li_4Ti_5O_(12)/C적전도솔,인차유효지개선료기전화학성능.재1C배솔하,Li_4Ti_5O_(12)/(Ag+C)복합재료적수차방전용량체도료164 mAh·g(-1).
Li_4Ti_5O_(12)/C composite anode with a sub-micron size was synthesized via one-step calcination reaction using Li_2CO_3 and TiO_2 as the starting materials and glucose as the carbon source.Li_4Ti_5O_(12)/(Ag+C)composite wasprepared by heating Li_4Ti_5O_(12)/C with AgNO_3.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 Li_4Ti_5O_(12)/C particle,causing the enhancement of its electronic conductivity.As a result,the electrochemical performance of Li_4Ti_5O_(12)/C Was improved.The Li_4Ti_5O_(12)/(Ag+C)composite shows a high initial discharge capacity of 164mAh·g~(-1)at 1C rate.