Nanoengineering to Achieve High Sodium Storage: A Case Study of Carbon Coated Hierarchical Nanoporous TiO2 Microfibers

作者：Wang, Nu^*; Gao, Yuan; Wang, Yun-Xiao^*; Liu, Kai; Lai, Weihong; Hu, Yemin; Zhao, Yong; Chou, Shu-Lei^*; Jiang, Lei

来源：Advanced Science, 2016, 3(8): 1600013.

DOI：10.1002/advs.201600013

• HIGH-PERFORMANCE ANODE
• ION BATTERIES
• GRAPHENE HYBRID
• SUPERIOR ANODE
• HIGH-CAPACITY
• LITHIUM
• INTERCALATION
• ELECTRODE
• NANOSPHERES
• NANOSHEETS

Nanoengineering of electrode materials can directly facilitate sodium ion accessibility and transport, thus enhancing electrochemical performance in sodium ion batteries. Here, highly sodium-accessible carbon coated nanoporous TiO2 microfibers have been synthesised via the facile electrospinning technique which can deliver an enhanced capacity of approximate to 167 mAh g(-1) after 450 cycles at current density of 50 mA g(-1) and retain a capacity of approximate to 71 mAh g(-1) at the high current rate of 1 A g(-1). With the benefits of their porous structure, thin TiO2 inner walls, and the introduction of conductive carbon, the nanoporous TiO2/C microfibers exhibit high ion accessibility, fast Na ion transport, and fast electron transport, thereby leading to the excellent Na-storage properties presented here. Nanostructuring is proven to be a fruitful strategy that can alleviate the reliance on materials' intrinsic nature; and the electrospinning technique is versatile and cost-effective for the fabrication of such an effective nanoporous microfiber structure.

• 出版日期2016-8
• 单位北京航空航天大学