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Issue 26, 2018, Issue in Progress
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New perspective to understand the effect of electrochemical prelithiation behaviors on silicon monoxide

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Abstract

Electrochemical prelithiation is a facile, effective and extensively used method to improve the initial coulombic efficiency of SiO. However, much less research attention has been devoted to prelithiation effect on initial several cycles. Here, we introduce a new perspective to evaluate the prelithiation behaviors, which could understand in depth the electrochemical prelithiation behaviors and their effects on the following two cycles. Then X-ray photoelectron spectroscopy was further performed to pinpoint the reaction products. It has been found that the quantity of irreversible Li4SiO4, Li2O and SEI (Li2CO3 and LiF) and reversible LixSi are increasing as the prelithiation time extending. When the prelithiation time extending over 20 min, only alloy reaction of Si has been revealed. The regeneration of SEI discloses at least 7% capacity loss in the first cycle which depends on the prelithiated time. However, the reformation of SEI in the second cycles reveals 3% capacity loss. Because the coulombic efficiencies are independent on prelithiated time in the second cycle which indicates only one discharge/charge cycle is enough to form integrated SEI and adequate irreversible Li4SiO4 and Li2O except part of unreactive SiOx.

Graphical abstract: New perspective to understand the effect of electrochemical prelithiation behaviors on silicon monoxide

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Supplementary files

Article information


Submitted
05 Mar 2018
Accepted
27 Mar 2018
First published
18 Apr 2018

This article is Open Access

RSC Adv., 2018,8, 14473-14478
Article type
Paper

New perspective to understand the effect of electrochemical prelithiation behaviors on silicon monoxide

C. Shen, R. Fu, Y. Xia and Z. Liu, RSC Adv., 2018, 8, 14473
DOI: 10.1039/C8RA01917G

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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