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作 者:戴海花 李凯瑞 代正昆 郑小燕 王勇龙 黎业生 Dai Haihua;Li Kairui;Dai Zhengkun;Zheng Xiaoyan;Wang Yonglong;Li Yesheng(School of Materials Science and Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
机构地区:[1]江西理工大学材料科学与工程学院,江西赣州341000
出 处:《稀有金属材料与工程》2021年第5期1781-1786,共6页Rare Metal Materials and Engineering
基 金:国家自然科学基金(51861009);江西省教育厅科技重点项目(GJJ160596)。
摘 要:通过预先将钛酸锂(Li4Ti5O_(12),LTO)材料组装的电池进行预充电脱锂(活化)的方式改变其结构,增强嵌锂能力,制备出高比容量LTO;随后以碳纳米管宏观膜(CMF)为集流体,替代金属箔集流体改善活性物质与集流体的结合界面,提高其电化学稳定性,最终得到具有高比容量及高稳定性的LTO电极。采用X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学测试等对LTO材料进行表征。结果表明:经过预脱锂活化后的LTO可容纳锂离子的空位增加,晶面间距明显增大,经测试其在1 C倍率能发挥192.7 m Ah·g^(-1)的比容量,比正常的LTO材料提高约30 m Ah·g^(-1);引入的CMF集流体能增强与活性材料的结合力,减小其在大电流下产生的接触阻抗,使其在5 C倍率下仍具有150 m Ah·g^(-1)的比容量,表现出优异的倍率性能。Changing the structure of lithium titanate(Li4Ti5O_(12),Abbre.LTO)material by delithiation(activation)in advance,to increase the internal lithium ion vacancy and enhance the lithium intercalation ability,a high specific capacity LTO was prepared.CMF(carbon nanotubes macro film)was introduced as a current collector instead of metal foil to improve its electrochemical stability.Finally,a LTO electrode having high specific capacity and high stability was obtained.Characterization was executed by X-ray diffraction(XRD),scanning electron microscopy(SEM)and electrochemical testing.The results show that the activated LTO can achieve a specific capacity of 192.7 mAh·g^(-1)at 1 C rate,which is about 30 mAh·g^(-1)higher than that of the normal LTO material.The introduced CMF current collector can enhance the binding force with the active material,and it still possesses a specific capacity of 150 mAh·g^(-1)at 5 C rate,exhibiting excellent rate performance.
分 类 号:TM911[电气工程—电力电子与电力传动]
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