Understanding Thermodynamic and Kinetic Contributions in Expanding the Stability Window of Aqueous Electrolytes

By Jiaxin Zheng, Guoyu Tan, Peng Shan, Tongchao Liu, Jiangtao Hu, Yancong Feng, Luyi Yang, Mingjian Zhang, Zonghai Chen, Yuan Lin and 7 more. Chem, 2018

239 citations recorded by the source corpus.

Summary Aqueous electrolytes come with an intrinsic narrow electrochemical stability window (1.23 V). Expanding this window represents significant benefits in both fundamental science and practical battery applications. Recent breakthroughs made via super-concentration have resulted in >3.0 V windows, but fundamental understanding of the related mechanism is still absent. In the present work, we examined the widened window (2.55 V) of a super-concentrated (unsaturated) aqueous solution of LiNO3 through both theoretical and spectral analyses and discovered that a local structure of intimate Li+-water interaction arises at super-concentration, generating (Li+(H2O)2)n polymer-like chains to replace the ubiquitous hydrogen bonding between water molecules. Such structure is mainly responsible for the expanded electrochemical stability window. Further theoretical and experimental analyses quantitatively differentiate the contributions to this window, identifying the kinetic factor (desolvation) as the main contributor. Such molecular-level and quantitative understanding will further assist in tailor designing more effective approaches to stabilizing water electrochemically.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/56f04332f0ecd00020f23f6a7c8bdf0a1e33dc56

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

  1. Arthur Wald Cresce
  2. Kang Xu
  3. Oleg Borodin
  4. B. Lucht
  5. Martin Winter
  6. Qiang Zhang
  7. Yi Cui
  8. Shengbo Zhang

Citations in the corpus