改性钛酸锂的储锂和储钠性能  

Lithium/Sodium Storage Properties of Modified Lithium Titanate Materials

作　　者：邹海林[1] 金翼[2] 王绥军[2] 项宏发[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]中国电力科学研究院电工与新材料研究所,北京100192

出　　处：《硅酸盐学报》2016年第10期1401-1408,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51372060);国家电网公司科技项目(DG71-14-033)

摘　　要：通过粉末X射线衍射、热重、差示扫描量热与扫描电子显微镜考察了6种改性钛酸锂材料的微观结构特征,并组装成扣式电池考察它们作为锂离子电池与钠离子电池负极材料时的电化学特征。结果表明:作为锂离子电池负极材料,无定形碳和碳纳米管包覆钛酸锂具有更高的可逆容量、优异的循环性能和良好的倍率性能;而作为钠离子电池负极材料,纳米化钛酸锂材料具有更好的储钠性能;一次粒子小于100 nm的钛酸锂材料,以0.1C充放电时可逆容量为155 m A·h/g,以0.2C放电、10C充电时,容量仍保持在118 m A·h/g。The structures of six kinds of modified lithium titanate anode materials were investigated by X-ray diffraction, thermogravimetry, differential scanning calorimetry, scanning electron microscopy, respectively. The electrochemical properties of the anode materials for lithium/sodium ion batteries were evaluated in coin cells. The results show that as anode material for lithium ion batteries, lithium titanate coated with amorphous carbon and carbon nanotube （CNT） exhibits higher reversible capacity/rate capability and superior cycling stability. Besides, nanosized lithium titanate exhibits a better cell performance for sodium storage, i.e., the lithium titanate particles with the size of 〈 100 nm deliver a reversible capacity of 155 mA h/g at 0.1C, and retains 118 mA h/g charging at 10C after 0.2C discharge.

关 键 词：钛酸锂 负极材料 储能 锂离子电池 钠离子电池 

分 类 号：O614.111[理学—无机化学]