Preparation and Performance of N-doped Carbon Coated Li4Ti5O12 as Anode Material for Lithium-ion Batteries†
Nannan ShiXue JiangYing ZhangKui ChengKe YeGuiling WangDianxue Cao
Abstract
以TiO 2 和Li 2 CO 3 分别作为钛源和锂源, 聚苯胺(PANI)作为碳源和氮源, 通过球磨辅助高温固相法合成N掺杂C包覆Li 4 Ti 5 O 12 . 通过X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)、元素分析仪(EA)、扫描电子显微镜(SEM)及透射电子显微镜(TEM)等对材料的结构和形貌进行了表征, 并将合成材料制成电极片组装成扣式电池, 测试其电化学性能. 结果显示, 钛源的处理对样品的性能有影响, 通过对TiO 2 预包覆合成的N掺杂C包覆Li 4 Ti 5 O 12 具有优异的电化学性能, 在碳、氮源的包覆比例(PANI与Li 4 Ti 5 O 12 的质量比)为5%时效果最佳:1 C放电时其比容量为157.6 mA·h/g, 20 C放电时其比容量仍可达到119.6 mA·h/g; 在10 C充放电循环100次后, 其比容量保持率为97.8%, 表明N掺杂C包覆Li 4 Ti 5 O 12 具有优异的倍率性能和循环稳定性.
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