SnO2 anode surface passivation by atomic layer deposited HfO2 improves li-ion battery performance
Type
ArticleAuthors
Yesibolati, NulatiShahid, Muhammad
Chen, Wei
Hedhili, Mohamed N.

Reuter, Mark C.
Ross, Frances M.
Alshareef, Husam N.

KAUST Department
Advanced Membranes and Porous Materials Research CenterCore Labs
Functional Nanomaterials and Devices Research Group
Imaging and Characterization Core Lab
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2014-03-14Online Publication Date
2014-03-14Print Publication Date
2014-07Permanent link to this record
http://hdl.handle.net/10754/563442
Metadata
Show full item recordAbstract
For the first time, it is demonstrated that nanoscale HfO2 surface passivation layers formed by atomic layer deposition (ALD) significantly improve the performance of Li ion batteries with SnO2-based anodes. Specifically, the measured battery capacity at a current density of 150 mAg -1 after 100 cycles is 548 and 853 mAhg-1 for the uncoated and HfO2-coated anodes, respectively. Material analysis reveals that the HfO2 layers are amorphous in nature and conformably coat the SnO2-based anodes. In addition, the analysis reveals that ALD HfO2 not only protects the SnO2-based anodes from irreversible reactions with the electrolyte and buffers its volume change, but also chemically interacts with the SnO2 anodes to increase battery capacity, despite the fact that HfO2 is itself electrochemically inactive. The amorphous nature of HfO2 is an important factor in explaining its behavior, as it still allows sufficient Li diffusion for an efficient anode lithiation/delithiation process to occur, leading to higher battery capacity. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Sponsors
The authors wish to thank R. B. Rakhi for her support. HNA and FMR acknowledge the support from the KAUST-IBM grant.Publisher
Wiley-VCH VerlagJournal
Smallae974a485f413a2113503eed53cd6c53
10.1002/smll.201303898