In:
Science, American Association for the Advancement of Science (AAAS), Vol. 330, No. 6010 ( 2010-12-10), p. 1515-1520
Abstract:
We report the creation of a nanoscale electrochemical device inside a transmission electron microscope—consisting of a single tin dioxide (SnO 2 ) nanowire anode, an ionic liquid electrolyte, and a bulk lithium cobalt dioxide (LiCoO 2 ) cathode—and the in situ observation of the lithiation of the SnO 2 nanowire during electrochemical charging. Upon charging, a reaction front propagated progressively along the nanowire, causing the nanowire to swell, elongate, and spiral. The reaction front is a “Medusa zone” containing a high density of mobile dislocations, which are continuously nucleated and absorbed at the moving front. This dislocation cloud indicates large in-plane misfit stresses and is a structural precursor to electrochemically driven solid-state amorphization. Because lithiation-induced volume expansion, plasticity, and pulverization of electrode materials are the major mechanical effects that plague the performance and lifetime of high-capacity anodes in lithium-ion batteries, our observations provide important mechanistic insight for the design of advanced batteries.
Type of Medium:
Online Resource
ISSN:
0036-8075
,
1095-9203
DOI:
10.1126/science.1195628
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2010
detail.hit.zdb_id:
128410-1
detail.hit.zdb_id:
2066996-3
detail.hit.zdb_id:
2060783-0
SSG:
11
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