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Title: Multiple-stripe lithiation mechanism of individual SnO2 nanowires in a flooding geometry

Journal Article · · Physical Review Letters, 106(24):Article No. 248302

The atomic scale lithiation mechanism of individual SnO2 nanowires in a flooding geometry with the entire wires being immersed in the electrolyte was revealed by in-situ transmission electron microscopy. The lithiation initiated multiple stripes with width of a few nanometer parallel to {020} planes transversing the entire wires, serving as multiple reaction fronts for late stage of lithiation. Inside the stripes, we identified high density of dislocations and enlarged inter-planar spacing, which provide effective path for lithium ion transport. The density of the stripes increased with further lithiation, and eventually they merged with one another, causing a large enlongation and volume expansion and the crystalline to amorphous phase transformation. This multiple stripes and multiple reaction fronts lithiation mechanism is unexpected and differs completely from the expected core-shell lithiation mechanism.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1030478
Report Number(s):
PNNL-SA-78260; PRLTAO; KP1704020
Journal Information:
Physical Review Letters, 106(24):Article No. 248302, Vol. 106, Issue 24; ISSN 0031-9007
Country of Publication:
United States
Language:
English

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