Journal
ACS NANO
Volume 13, Issue 1, Pages 671-680Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b07811
Keywords
sodium ion storage; hierarchical nanoarchitecture; anode; high rate; long cycle life
Categories
Funding
- National Science Foundation [DMR-1454984]
- National Natural Science Foundation of China [21676165]
- Shanghai Natural Science Foundation [15ZR1422300]
- DOE Office of Science [DE-AC02-06CH11357]
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The sluggish kinetic in electrode materials is one of the critical challenges in achieving high-power sodium ion storage. We report a coaxial core-shell nanostructure composed of carbon nanotube (CNT) as the core and TiO2@MoO2@C as shells for a hierarchically nanoarchitectured anode for improved electrode kinetics. The 1D tubular nanostructure can effectively reduce ion diffusion path, increase electrical conductivity, accommodate the stress due to volume change upon cycling, and provide additional interfacial active sites for enhanced charge storage and transport properties. Significantly, a synergistic effect between TiO2 and MoO2 nanostructures is investigated through ex situ solid-state nuclear magnetic resonance. The electrode exhibits a good rate capability (150 mAh g(-1) at 20 A g(-1)) and superior cycling stability with a reversibly capacity of 175 mAh g(-1) at 10 A g(-1) for over 8000 cycles.
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