• DOI:10.1039/c9nr03445e
• Corpus ID: 195760953

Fully reversible lithium storage of tin oxide enabled by self-doping and partial amorphization.

@article{Pang2019FullyRL,
  title={Fully reversible lithium storage of tin oxide enabled by self-doping and partial amorphization.},
  author={Yuepeng Pang and Jing Wang and Junhe Yang and Fang Fang and Dalin Sun and Shiyou Zheng},
  journal={Nanoscale},
  year={2019}
}

• Y. Pang, Jing Wang, +3 authors Shiyou Zheng
• Published 11 July 2019
• Materials Science
• Nanoscale

SnO2 has a high theoretical capacity of 1493 mA h g-1 as an anode material for Li-ion batteries, but its full reversibility is difficult to achieve upon cycling due to the sluggish kinetics. We for the first time demonstrate a fully reversible SnO2 anode for Li-ion batteries enabled by self-doping and partial amorphization by anchoring its nanoparticles on a graphene/single walled carbon nanotube hybrid framework. The uniquely structured nanocomposite containing 74% SnO2 exhibits high reversible capacities together with good rate and cycling capabilities. For instance, the composite anode retains an overall capacity of 1215 mA h g-1 (1425 mA h g-1 for SnO2) after 200 cycles at 0.1 A g-1, which is very close to its theoretical capacity. Moreover, an overall capacity of 947 mA h g-1 (1062 mA h g-1 for SnO2) can be delivered at a higher rate (1 A g-1) with 98% capacity retention over 350 cycles. This exceptional performance can be attributed to the formation of highly dispersed metallic Sn in the Li2O matrix during cycling, which is caused by the unique two-step lithiation mechanism of the self-doped and partially amorphous SnO2 nanoparticles. A similar strategy can also be applied to develop other high-performance electrodes with conversion reactions.