三维尖晶石Li_4Ti_5O_(12)纳米丝网状电极的构置与电化学性能

Fabrication and Electrochemical Properties of 3-dimensional Net Architectures of Spinel Li_4Ti_5O_(12) Nanofibers

首次采用电纺丝技术结合高温退火成功地构置了含尖晶石Li4Ti5O12的纳米纤维丝三维(3D)网状结构,并测量了三维电池的充放电性能。X射线衍射谱(XRD)、扫描电子显微镜(SEM)和电池循环性能测试等方法表征纤维丝3D结构和电化学性能。研究结果表明了Li4Ti5O12纳米丝的零应变特性、构建的3D阵列的结构稳定性和在大电流密度下较好的充放电性能。显示了Li4Ti5O12可作为3D电池的电极材料。

In order to evaluate the possibility of 3-dimensional architectures of rechargeable lithium ion batteries, 3D net architectures of Li4Ti5O12 nanofibers electrodes were prepared by an electrospinning method. X-ray diffraction, scanning electron microscopy, and the discharge and charge measurements were used to characterize their structures and electrochemical properties. The inorganic framework of spinel Li4Ti5O12 was achieved at calcination temperature of 750 ℃. The high initial discharge capacity can be found to be 170 mAh·g^-1 for 3D Li4Ti5O12/Li cell, and better cycling performance under large currents could be obtained. SEM and XRD data indicate the 3-dimensional net architectures of spinel Li4Ti5O12 keep a constant when Li ions are inserted into spinel Li4Ti5O12. The result demonstrates that spinel Li4Ti5O12 could be selected as one of promising candidates for the realization of 3D batteries considering its structure stability of 3D spinel Li4Ti5O12 nanofibers associated with well cyclability.