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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Morphological Evolution and Solid-Electrolyte Interphase Formation on LiNi0.6Mn0.2Co0.2O2 Cathodes Using Highly

Meisam Hasanpoor1, Damien Saurel2, Rosalía Cid Barreno2

  • 1Institute for Frontier Materials, Deakin University, 221 Burwood Highway, Burwood, Victoria 3125, Australia.

ACS Applied Materials & Interfaces
|March 11, 2022
PubMed
Summary
This summary is machine-generated.

This study stabilizes high-voltage lithium metal battery cathodes using a novel ionic liquid electrolyte. The electrolyte forms a protective solid-electrolyte interphase, enhancing cycling stability and capacity retention.

Keywords:
Ni-rich cathodeSEI modificationdegradation mechanismionic liquidslithium-metal battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-voltage nickel-rich cathodes in lithium metal batteries (LMBs) face challenges with electrode/electrolyte interface stability.
  • Key issues include the formation of a stable solid-electrolyte interphase (SEI) and preventing active material pulverization for efficient long-term cycling.

Purpose of the Study:

  • To investigate the performance of NMC622 cathodes using a highly concentrated ionic liquid electrolyte (ILE).
  • To evaluate the stability and protective capabilities of the SEI formed by the ILE at the cathode interface.

Main Methods:

  • Utilized NMC622 cathodes (1 mAh cm-2) with a highly concentrated ionic liquid electrolyte: N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (C3mpyrFSI) and 50 mol % lithium bis(fluorosulfonyl)imide (LiFSI).
  • Conducted cycling performance tests and impedance spectroscopy at 50 °C.
  • Analyzed ion mixing and lattice expansion.

Main Results:

  • The ILE facilitated the formation of a stable SEI on the NMC622 cathode, leading to excellent cycling performance with 98.13% capacity retention after 100 cycles.
  • Observed minimal ion mixing and lattice expansion even at elevated temperatures (50 °C).
  • Impedance analysis showed low and stable SEI resistivity (RSEI), while active material pulverization increased charge transfer resistance (RCT).

Conclusions:

  • The developed ionic liquid electrolyte effectively stabilizes the electrode/electrolyte interface in high-voltage LMBs.
  • The stable SEI layer is crucial for suppressing active material degradation and achieving long-term cycling stability.
  • This approach offers a promising strategy for enhancing the performance of next-generation lithium metal batteries.