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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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High-Performance Cells Containing Lithium Metal Anodes, LiNi0.6Co0.2Mn0.2O2 (NCM 622) Cathodes, and Fluoroethylene
Gregory Salitra1, Elena Markevich1, Michal Afri1
1Department of Chemistry , Bar-Ilan University , Ramat Gan 52900 , Israel.
ACS Applied Materials & Interfaces
|May 23, 2018
Summary
Stable lithium metal batteries with high energy density were achieved using fluoroethylene carbonate electrolytes. These batteries show hundreds of stable cycles, attributed to a robust solid electrolyte interphase (SEI) layer on lithium metal anodes.
Area of Science:
- Electrochemistry
- Materials Science
Background:
- Lithium metal batteries offer high energy density but face challenges with electrode stability.
- Developing stable solid electrolyte interphase (SEI) layers is crucial for long-term battery performance.
Purpose of the Study:
- To investigate the stability and performance of lithium metal|LiNi0.6Co0.2Mn0.2O2 (NCM 622) cells using fluoroethylene carbonate (FEC)-based electrolytes.
- To analyze the formation and composition of the solid electrolyte interphase (SEI) on lithium metal electrodes.
Main Methods:
- Electrochemical cycling of Li|NCM 622 and symmetric Li|Li cells.
- Analysis of SEI composition using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR).
Main Results:
- Li|NCM 622 cells demonstrated over 600 stable cycles at 1.5 mA cm-2 with high rate capability.
- Symmetric Li|Li cells showed over 1000 cycles with stable performance at higher capacities.
- A stable and efficient SEI layer formed on lithium metal anodes in FEC-based electrolytes, contributing to excellent cell performance.
Conclusions:
- FEC-based electrolytes promote the formation of a stable SEI, enabling highly stable and high-rate lithium metal batteries.
- Capacity fading and recovery phenomena in Li|NCM cells are linked to SEI formation kinetics and electrolyte amount.
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