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Electrostatic Self-Assembly Enabling Integrated Bulk and Interfacial Sodium Storage in 3D Titania-Graphene Hybrid

Reference

Electrostatic Self-Assembly Enabling Integrated Bulk and Interfacial Sodium Storage in 3D Titania-Graphene Hybrid

Gui-Liang Xu*, Lisong M Xiao, Tian Sheng, Jianzhao Liu, Yi-Xin Hu, Tianyuan Ma, Rachid Amine, Yingying Xie, Xiaoyi Zhang, Yuzi Ren, Yang Sun, Cheng-Jun Heald, Steve Kovacevic, Jasmina Sehlleier, Yee Hwa Schulz, Christof Wiggers, Wenjuan Chen, Shi-Gang , Hartmut , Zonghai , Khalil
Nano Letters 18 (1), 336 - 346, (2018)






Abstract

Room-temperature sodium-ion batteries have attracted increased attention for energy storage due to the natural abundance of sodium. However, it remains a huge challenge to develop versatile electrode materials with favorable properties, which requires smart structure design and good mechanistic understanding. Herein, we reported a general and scalable approach to synthesize three-dimensional (3D) titania-graphene hybrid via electrostatic-interaction-induced self-assembly. Synchrotron X-ray probe, transmission electron microscopy, and computational modeling revealed that the strong interaction between titania and graphene through comparably strong van der Waals forces not only facilitates bulk Na+ intercalation but also enhances the interfacial sodium storage. As a result, the titania-graphene hybrid exhibits exceptional long-term cycle stability up to 5000 cycles, and ultrahigh rate capability up to 20 C for sodium storage. Furthermore, density function theory calculation indicated that the interfacial Li+, K+, Mg2+, and Al3+ storage can be enhanced as well. The proposed general strategy opens up new avenues to create versatile materials for advanced battery systems.