Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7732767 | Journal of Power Sources | 2015 | 37 Pages |
Abstract
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 10Â mAÂ cmâ2 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 1Â mAÂ cmâ2 (1Â C-rate), which demonstrates practical applicability in Li ion batteries through replacing the graphite anode with a CPL-coated Li metal anode.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Hongkyung Lee, Dong Jin Lee, Yun-Jung Kim, Jung-Ki Park, Hee-Tak Kim,