Journal
JOURNAL OF POWER SOURCES
Volume 284, Issue -, Pages 103-108Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.03.004
Keywords
Composite protective layer; High current density; Lithium ion battery; Lithium metal; Lithium plating
Funding
- National Research Foundation of Korea - Korean Government (MEST) [NRF-2009-0094219, NRF-2014R1A1A2056199]
- National Research Foundation of Korea [2014R1A1A2056199, 2009-0094227] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2015 Elsevier B.V. All rights reserved.
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