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Title: The electrochemical reactions of SnO 2 with Li and Na: A study using thin films and mesoporous carbons

In this work we have determined the room temperature electrochemical reactivity of SnO 2 thin films and mesoporous carbons filled with SnO 2 anodes with Na, and compare the results with those obtained during the reaction with Li. We show that SnO 2 can reversibly deliver up to 6.2 Li/SnO 2 whereas the reaction with Na is significantly limited. The initial discharge capacity is equivalent to less than 4 Na/SnO 2, which is expected to correspond to the formation of 2 Na 2O and Sn. This limited discharge capacity suggests the negative role of the formed Na 2O matrix upon the reversible reaction of Sn clusters. Moreover, the reversible cycling of less than 1 Na/SnO 2, despite the utilization of 6-7 nm SnO 2 particles, is indicative of sluggish reaction kinetics. The origin of this significant capacity reduction is likely due to the formation of a diffusion limiting interface. Furthermore, there is a larger apparent hysteresis compared to Li. These results point to the need to design composite structures of SnO 2 nanoparticles with suitable morphological and conductivity components.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 284; Journal Issue: C; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1185911