Toward the Sustainable Lithium Metal Batteries with a New Electrolyte Solvation Chemistry
- Authors
- Lee, Seon Hwa; Hwang, Jang-Yeon; Ming, Jun; Cao, Zhen; Hoang Anh Nguyen; Jung, Hun-Gi; Kim, Jaekook; Sun, Yang-Kook
- Issue Date
- May-2020
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- electrolyte solvation structures; high energy density; Li-Mg alloys; lithium metal batteries
- Citation
- ADVANCED ENERGY MATERIALS, v.10, no.20, pp.1 - 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED ENERGY MATERIALS
- Volume
- 10
- Number
- 20
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2060
- DOI
- 10.1002/aenm.202000567
- ISSN
- 1614-6832
- Abstract
- Herein, a new solvation strategy enabled by Mg(NO3)2 is introduced, which can be dissolved directly as Mg2+ and NO3− ions in the electrolyte to change the Li+ ion solvation structure and greatly increase interfacial stability in Li-metal batteries (LMBs). This is the first report of introducing Mg(NO3)2 additives in an ester-based electrolyte composed of ternary salts and binary ester solvents to stabilize LMBs. In particular, it is found that NO3− efficiently forms a stable solid electrolyte interphase through an electrochemical reduction reaction, along with the other multiple anion components in the electrolyte. The interaction between Li+ and NO3− and coordination between Mg2+ and the solvent molecules greatly decreases the number of solvent molecules surrounding the Li+, which leads to facile Li+ desolvation during plating. In addition, Mg2+ ions are reduced to Mg via a spontaneous chemical reaction on the Li metal surface and subsequently form a lithiophilic Li–Mg alloy, suppressing lithium dendritic growth. The unique solvation chemistry of Mg(NO3)2 enables long cycling stability and high efficiency of the Li-metal anode and ensures an unprecedented lifespan for a practical pouch-type LMB with high-voltage Ni-rich NCMA73 cathode even under constrained conditions.
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