Journal
SMALL METHODS
Volume 5, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202001035
Keywords
corrosion resistance; ionic conductivity; lithium metal anodes; mechanical properties; protective layers
Funding
- National Natural Science Foundation of China [51972190, U1601206]
- National Key Research and Development Program of China [2018YFE0124500]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2017B030306006]
- Local Innovative and Research Teams Project of the Guangdong Pearl River Talents Program [2017BT01N111]
- Shenzhen Basic Research Project [JCYJ20180508152037520]
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This review summarizes the recent progress on constructing protective layers on lithium metal anode materials and discusses the design principles, highlighting advanced protective layers with different properties and their importance in addressing safety concerns in lithium metal batteries.
Lithium metal is the most promising candidate anode material for high energy density batteries, but its high activity and severe dendrite growth lead to safety concerns and limit its practical use. Constructing a protective layer (PL) on the lithium surface to avoid the side reactions and stabilize the electrode-electrolyte interface is an effective approach to solve these problems. In this review, the recent progress on PLs is summarized, and their desired properties and design principles are discussed from the aspects of materials selection and the corresponding fabrication methods. Advanced PLs with different properties are then highlighted, including a self-adjusting feature to increase structural integrity, the synergistic effect of organic and inorganic hybrids to improve mechanical properties and ionic conductivity, the use of embedded groups and ion diffusion channels to regulate ion distribution and flux, and a protective barrier to suppress corrosion from humid air or water. Finally, the remaining challenges and the possible solutions for PL design in future studies are proposed.
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