Citation: Miaofeng Huang, Jiajie Yang, Siron Zhen, Chubin Wan, Xiaoping Jiang, Xin Ju. Fabrication of high Li: water molar ratio electrolytes for lithium-ion batteries[J]. Chinese Chemical Letters, ;2021, 32(2): 834-837. doi: 10.1016/j.cclet.2020.05.008 shu

Fabrication of high Li: water molar ratio electrolytes for lithium-ion batteries

Miaofeng Huang ^a ,
Jiajie Yang ^a ,
Siron Zhen ^a ,
Chubin Wan ^a ,
Xiaoping Jiang ^b ,
Xin Ju ^{a, *,}

a.
University of Science and Technology Beijing, Beijing 100083, China
b.
Qilu University of Technology, Shandong Academy of Sciences, Ji'nan 250014, China

jux@ustb.edu.cn

Received Date: 4 March 2020
Revised Date: 7 May 2020
Accepted Date: 9 May 2020
Available Online: 14 May 2020

Figures(4)

Hydrous electrolytes with high electrochemical potentials were obtained by hydrating water molecules into solutes to form high Li: water molar ratio electrolytes (HMRE). Solid polyethylene glycol (PEG) were employed to enhance the molar ratio of Li⁺ to water in the electrolytes while reducing the consumption of Li-salt. The obtained mole ratio of Li⁺ to water molecules in the hydrous electrolytes was greater than 1:1; however, the mass fraction of Li-salt was reduced to 61% (approximately 5.5 mol/kg, based on water and PEG). Compared with that of water-in-salt electrolytes, the mass fraction of Li-salt could be remarkably reduced by adding solid PEG. The electrochemical stability of the electrolytes improved considerably because of the strong hydration of Li⁺ by the water molecules. A beneficial passivation effect, arising from the decomposition of the electrolyte, at a wide potential window was observed.
- Aqueous electrolyte,
- Wide potential window,
- Aqueous Li-ion battery,
- Solid electrolyte interface,
- Water-in-salt electrolytes
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