Sr_1−xNa_2xLi₂Ti₆O₁₄ (0≤x≤1) as anode materials for rechargeable Li-ion batteries

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• 作者：Hua Lan^a ; Shangshu Qian^a ; Qin Wang^b ; ^{wangqin@nbu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Lei Yan^a ; Haoxiang Yu^a ; Peng Li^a ; Nengbing Long^a ; Miao Shui^a ; Jie Shu^a ; ^{sergio_shu@hotmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Solid-state method ; Anode materials ; SrLi2Ti6O14 ; Na2Li2Ti6O14 ; Doping ; Electrochemical performance
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1552-1557
• 全文大小：1553 K

文摘

In order to further expand the application of lithium titanate anode materials for lithium ion batteries (LIBs), a series of Sr_1−xNa_2xLi₂Ti₆O₁₄ (x=0, 0.25, 0.5, 0.75, 1) have been synthesized by the solid-state method. The structure, morphology and their electrochemical properties have been investigated by X-ray diffraction (XRD), scanning electronic microscope (SEM), high-resolution transmission electron microscope (HRTEM), galvanostatic charge-discharge tests and electrochemical impedance spectroscopy (EIS) measurements. Electrochemical analysis suggests Sr_0.5NaLi₂Ti₆O₁₄ to show the better cycling stability, delivering a charge capacity of 184 mA h g⁻¹ at the current density of 50 mA g⁻¹ for the first cycle, and to exhibit reversible capacity of 176.8 mA h g⁻¹ after 50 cycles corresponding to 0.0782% capacity decrease per cycle. Besides, Sr_0.5NaLi₂Ti₆O₁₄ also has the highest lithium-ion diffusion coefficient among all the examined samples.