A simple composite protective layer coating that enhances the cycling stability of lithium metal batteries

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Metallic lithium is the most promising negative electrode for high-energy rechargeable batteries due to its extremely high specific capacity and its extremely low redox potential. However, the low cycle efficiency and lithium dendrite formation during the charge/discharge processes consistently hinder its practical application. In this report, we present a stabilized Li electrode on which a Li+ ion conductive inorganic/organic composite protective layer (CPL) is coated. With the introduction of the CPL, the Li dendrite growth and electrolyte decomposition are effectively suppressed; consequently, stable Li plating/stripping at high current densities up to 10 mA cm(-2) is possible. Nanoindentation tests demonstrate that the shear modulus of the CPL at narrow indentations is 1.8 times higher than that of the Li metal, which provides a theoretical understanding for its efficacy. Moreover, the LiCoO2/Li cell incorporating CPL exhibits excellent cycling stability up to 400 cycles at 1 mA cm(-2) (1 C-rate), which demonstrates practical applicability in Li ion batteries through replacing the graphite anode with a CPL-coated Li metal anode.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2015-06
Language
English
Article Type
Article
Citation

JOURNAL OF POWER SOURCES, v.284, pp.103 - 108

ISSN
0378-7753
DOI
10.1016/j.jpowsour.2015.03.004
URI
http://hdl.handle.net/10203/199047
Appears in Collection
CBE-Journal Papers(저널논문)
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