Mechanistic Study of Functional Electrolyte Solvents for High-Voltage Lithium Batteries
Journal Article
·
· ACS Applied Materials and Interfaces
- South Dakota School of Mines and Technology, Rapid City, SD (United States)
- Lynntech Inc., College Station, TX (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
The pervasive use of Ni-rich cathode active materials, e.g., LiNi0.8Mn0.1Co0.1O2 (NMC811), for high-energy-density Li-ion batteries (LIBs) has been hindered by rapid battery capacity decay when cycled with high charge cutoff voltages due to electrolyte decomposition in the conventional carbonate solvent-based electrolytes, oxidative parasitic side reactions at the electrolyte/cathode interface, and irreversible phase changes in the cathode active materials leading to dissolution of transition metals into the electrolytes. Various functional electrolyte solvents have been studied to tackle the above technical challenges, yet the roles of individual solvents in the performance of LIBs remain poorly understood. Here, in this study, we systematically investigate electrochemical performance mechanisms of fluorinated and organosilicon single solvents and cosolvents, for the first time, in high-voltage Li/NMC811 batteries, using electrochemical and analytical characterizations and density functional theory modeling. We observe that some unique combinations of the functional solvents can lead to exceptionally stable high-voltage cycle performance in the Ni-rich cathode-based LIBs. Our mechanistic study reveals that the synergistic effect of solvents plays a vital role in enabling electrochemical stability at both the Ni-rich cathode and the Li metal anode. Understanding the electrochemical performance mechanisms of functional solvents can greatly help in designing and formulating advanced electrolytes that enable the development of high-voltage, high-energy-density, long-cycle-life lithium batteries.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Aeronautics and Space Administration (NASA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 2998908
- Journal Information:
- ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 41 Vol. 17; ISSN 1944-8244; ISSN 1944-8252
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fluorinated High-Voltage Electrolytes To Stabilize Nickel-Rich Lithium Batteries
A Green, Fire–Retarding Ether Solvent for Sustainable High–Voltage Li–Ion Batteries at Standard Salt Concentration
Journal Article
·
Sun Sep 10 20:00:00 EDT 2023
· ACS Applied Materials and Interfaces
·
OSTI ID:2352213
A Green, Fire–Retarding Ether Solvent for Sustainable High–Voltage Li–Ion Batteries at Standard Salt Concentration
Journal Article
·
Wed Jul 10 20:00:00 EDT 2024
· Advanced Energy Materials
·
OSTI ID:2432557