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Issue 10, 2018
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Enabling a highly reversible conversion reaction in a lithiated nano-SnO2 film coated with Al2O3 by atomic layer deposition

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Abstract

The huge decay in the reversible capacity and low initial coulombic efficiency (ICE) of a lithiated SnO2 film anode originate mainly from the limited reversibility of the conversion reaction. The inhibition of Sn coarsening is the key to promote the reversible conversion of Sn/Li2O to SnO2. Herein, we designed a double-layer electrode comprising a SnO2 layer (thickness of ∼20 nm) coated with an Al2O3 layer by atomic layer deposition as a conceptual model. The Al2O3 coating (∼5 nm) on the surface and the interior filling of Al2O3 helped to increase the boundary integrity of SnO2 nanocrystals, and acted as a barrier to prevent lithiation-induced Sn coarsening during cycling, ensuring a highly reversible conversion reaction in the SnO2/Al2O3 film electrode. Thus, this SnO2/Al2O3 electrode contributed superior electrochemical performance with a higher ICE (88.1%) and better reversible capacity retention (88.9% after 200 cycles) than the pure SnO2 anode (30.6%); this demonstrated that the surface modification of nanograins of conversion-type anode materials could be helpful for enhancing the reversibility and cyclability of the electrode and enabling a high stable reversible capacity.

Graphical abstract: Enabling a highly reversible conversion reaction in a lithiated nano-SnO2 film coated with Al2O3 by atomic layer deposition

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Publication details

The article was received on 22 Oct 2017, accepted on 05 Feb 2018 and first published on 05 Feb 2018


Article type: Paper
DOI: 10.1039/C8TA00290H
Citation: J. Mater. Chem. A, 2018,6, 4374-4385
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    Enabling a highly reversible conversion reaction in a lithiated nano-SnO2 film coated with Al2O3 by atomic layer deposition

    H. Zhang, Z. Chen, R. Hu, J. Liu, J. Cui, W. Zhou and C. Yang, J. Mater. Chem. A, 2018, 6, 4374
    DOI: 10.1039/C8TA00290H

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