Integrated Intercalation-Based and Interfacial Sodium Storage in Graphene-Wrapped Porous Li4Ti5O12 Nanofibers Composite Aerogel

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• 作者：Chaoji Chen ; Henghui Xu ; Tengfei Zhou ; Zaiping Guo ; Lineng Chen ; Mengyu Yan ; Liqiang Mai ; Pei Hu ; Shijie Cheng ; Yunhui Huang and Jia Xie
• 刊名：Advanced Energy Materials
• 出版年：2016
• 出版时间：July 6, 2016
• 年：2016
• 卷：6
• 期：13
• 全文大小：3039K
• ISSN：1614-6840

文摘

Sodium storage in both solid–liquid and solid–solid interfaces is expected to extend the horizon of sodium-ion batteries, leading to a new strategy for developing high-performance energy-storage materials. Here, a novel composite aerogel with porous Li₄Ti₅O₁₂ (PLTO) nanofibers confined in a highly conductive 3D-interconnected graphene framework (G-PLTO) is designed and fabricated for Na storage. A high capacity of 195 mA h g⁻¹ at 0.2 C and super-long cycle life up to 12 000 cycles are attained. Electrochemical analysis shows that the intercalation-based and interfacial Na storage behaviors take effect simultaneously in the G-PLTO composite aerogel. An integrated Na storage mechanism is proposed. This study ascribes the excellent performance to the unique structure, which not only offers short pathways for Na⁺ diffusion and conductive networks for electron transport, but also guarantees plenty of PLTO–electrolyte and PLTO–graphene interfacial sites for Na⁺ adsorption.