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Origin and hysteresis of lithium compositional spatiodynamics within battery primary particles

Title
Origin and hysteresis of lithium compositional spatiodynamics within battery primary particles
Author
소홍윤
Issue Date
2016-08
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE, v. 353, no. 6299, page. 566-571
Abstract
The kinetics and uniformity of ion insertion reactions at the solid-liquid interface govern the rate capability and lifetime, respectively, of electrochemical devices such as Li-ion batteries. Using an operando x-ray microscopy platform that maps the dynamics of the Li composition and insertion rate in LixFePO4, we found that nanoscale spatial variations in rate and in composition control the lithiation pathway at the subparticle length scale. Specifically, spatial variations in the insertion rate constant lead to the formation of nonuniform domains, and the composition dependence of the rate constant amplifies nonuniformities during delithiation but suppresses them during lithiation, and moreover stabilizes the solid solution during lithiation. This coupling of lithium composition and surface reaction rates controls the kinetics and uniformity during electrochemical ion insertion.
URI
http://science.sciencemag.org/content/353/6299/566https://repository.hanyang.ac.kr/handle/20.500.11754/76353
ISSN
0036-8075; 1095-9203
DOI
10.1126/science.aaf4914
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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