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H 2 O Activity Adjustment by Hydrogen Bonding Enables High-Performance Zn-Organic Battery.

Kang ZhouNan WangXuan QiuHaijiao XiePeng WeiXiaoli DongYong-Gang Wang
Published in: ChemSusChem (2022)
The advantages of low cost and high safety of zinc (Zn) metal have attracted much attention on its application in batteries, but H 2 O-induced issues of hydrogen evolution reaction (HER), Zn corrosion, and Zn dendrites formation limit the application. Here, a strategy of adjusting H 2 O activity was provided by adding glycerol (GL) and acetonitrile (AN) into aqueous electrolyte to form hydrogen bonds between organic solvents and H 2 O, which alleviated the Zn corrosion. Furthermore, molecular dynamics (MD) simulation indicated that GL could exclude H 2 O from the Zn 2+ solvation shell, thus preventing undesired HER and Zn dendrites formation. Therefore, the corresponding Zn//Zn symmetrical cell showed a ultralong lifespan (1300 h). Then, a Zn-organic battery with 3,7-dimorpholino-phenothiazin-5-ium iodide (FD28) cathode was fabricated by using such electrolyte. Interestingly, the reduced H 2 O activity also ensured the stable operation of organic cathode, and thus the full cell showed superior cycle stability for over 9000 cycles (≈1100 h), which is superior to previous reports. Moreover, such electrolyte owns novel properties of nonflammability, great weatherability, and low freezing point, thus boosting the practicality of the battery.
Keyphrases
  • heavy metals
  • molecular dynamics
  • ionic liquid
  • low cost
  • single cell
  • oxidative stress
  • water soluble
  • density functional theory
  • bone marrow
  • diabetic rats
  • adverse drug