Ionic Conductor of Li2SiO3 as an Effective Dual-Functional Modifier To Optimize the Electrochemical Performance of Li4Ti5O12 for High-Performance Li-Ion Batteries

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• 作者：Xue Bai ; Tao Li ; Zhiya Dang ; Yong-Xin Qi ; Ning Lun ; Yu-Jun Bai
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 18, 2017
• 年：2017
• 卷：9
• 期：2
• 页码：1426-1436
• 全文大小：733K
• ISSN：1944-8252

文摘

Ionic conductor of Li₂SiO₃ (LSO) was used as an effective modifier to fabricate surface-modified Li₄Ti₅O₁₂ (LTO) via simply mixing followed by sintering at 750 °C in air. The electrochemical performance of LTO was enhanced by merely adjusting the mass ratio of LTO/LSO, and the LTO/LSO composite with 0.51 wt % LSO exhibited outstanding rate capabilities (achieving reversible capacities of 163.8, 157.6, 153.1, 147.0, and 137.9 mAh g^–1 at 100, 200, 400, 800, and 1600 mA g^–1, respectively) and remarkable long-term cycling stability (120.2 mAh g^–1 after 2700 cycles with a capacity fading rate of only 0.0074% per cycle even at 500 mA g^–1). Combining structural characterization with electrochemical analysis, the LSO coating coupled with the slight doping effect adjacent to the LTO surface contributes to the enhancement of both electronic and ionic conductivities of LTO.