Integrated Intercalation-Based and Interfacial Sodium Storage in Graphene-Wrapped Porous Li4Ti5O12 Nanofibers Composite Aerogel
Integrated Intercalation-Based and Interfacial Sodium Storage in Graphene-Wrapped Porous Li4Ti5O12 Nanofibers Composite Aerogel
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DOI：
10.1002/aenm.201600322
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发表时间：
2016-07-06
影响因子：
27.8
通讯作者：
Xie, Jia
中科院分区：
文献类型：
--
作者：
Chen, Chaoji;Xu, Henghui;Xie, Jia
钠在固-液和固-固界面中的储存有望扩大钠离子电池的范围，从而为开发高性能储能材料带来新的策略。在这里，一种新型的复合气凝胶与多孔Li 4 Ti 5 O 12（PLTO）纳米纤维限制在一个高度导电的三维互连石墨烯框架（G-PLTO）的设计和制造的钠存储。在0.2C时，其比容量可达195 mAh g（-1），循环寿命可达12000次。电化学分析表明，G-PLTO复合气凝胶具有插层储钠和界面储钠的双重作用。提出了一个完整的钠存储机制。该研究将优异的性能归因于独特的结构，其不仅提供了用于Na+扩散的短路径和用于电子传输的导电网络，而且还保证了大量的PLTO-电解质和PLTO-石墨烯界面位点用于Na+吸附。
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.