A 3-D binder-free nanoporous anode for a safe and stable charging of lithium ion batteries

作者：Chen, Yijun; Wang, Yunsong; Yousaf, Muhammad; Ma, Zhimin; Zou, Mingchu; Cao, Anyuan^*; Han, Ray P. S.^*

来源：Materials Research Bulletin, 2017, 93: 1-8.

DOI：10.1016/j.materresbull.2017.02.041

• Microporous materials
• Nanostructures
• Solvothermal
• Electrochemical measurements
• Energy storage

Nb2O5 is considered as a promising safe anode material for lithium ion batteries due to its high operating voltage (>1 V) that prevents the formation of the solid electrolyte interface; however, the low intrinsic conductivity and pulverization during long-term charge/discharge process limit its practical use. To address these twin adverse issues, we report on the development of a 3-D nanoporous anode that is binder-free by uniformly depositing in-situ orthorhombic Nb2O5 nanocrystals inside the highly conductive carbon nanotube sponge. The end result is a novel 3-D hybrid anode that delivers a maximum reversible capacity of 230 mAh g(-1) within a voltage window of 1.0-3.0 V versus Li/Li+. At a current density of 1 A g(-1) (5C), the hybrid anode exhibits a specific capacity of-150 mAh g(-1) with an 82% retention after 1000 charge/discharge cycles, which represents an improved cycling stability and rate capability compared to conventional powder anodes.

• 出版日期2017-9
• 单位北京大学