The electrochemical reactions of SnO2 with Li and Na: A study using thin films and mesoporous carbons

JOURNAL OF POWER SOURCES

卷:284

Article

Gorka, Joanna¹  Baggetto, Loic²  Keum, Jong K.³  Mahurin, Shannon M.¹  Mayes, Richard T.¹  Dai, Sheng^1,4  Veith, Gabriel M.² 

[1] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Oak Ridge Natl Lab, Spallat Neutron Source, Neutron Sci Directorate, Oak Ridge, TN 37831 USA

[4] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA

关键词: Tin dioxide;    Thin films;    Mesoporous carbons;    Na-ion anode;    Rechargeable batteries;   

DOI  :  10.1016/j.jpowsour.2015.02.152

来源: Elsevier

【 摘 要 】

In this work we have determined the room temperature electrochemical reactions of SnO2 thin films and mesoporous carbons filled with SnO2 anodes with Na, and compare the results with those obtained during the reaction with Li. We show that SnO2 can reversibly deliver up to 6.2 Li/SnO2 whereas the reaction with Na is significantly limited. The initial discharge capacity is equivalent to less than 4 Na/SnO2, which is expected to correspond to the formation of 2 Na2O and Sn. This limited discharge capacity suggests the negative role of the formed Na2O matrix upon the reversible reaction of Sn clusters. Moreover, the reversible cycling of less than I Na/SnO2, despite the utilization of 6-7 nm SnO2 particles, is indicative of sluggish reaction kinetics. The origin of this significant capacity reduction is probably 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 SnO2 nanoparticles with suitable morphological and conductivity components. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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