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Engineering a High-Voltage Durable Cathode/Electrolyte Interface for All-Solid-State Lithium Metal Batteries via Electropolymerization. | LitMetric

Engineering a High-Voltage Durable Cathode/Electrolyte Interface for All-Solid-State Lithium Metal Batteries via Electropolymerization.

ACS Appl Mater Interfaces

State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.

Published: May 2022

AI Article Synopsis

  • PEO-based polymer electrolytes are flexible and compatible with lithium metal anodes but struggle with high-voltage cathodes due to the oxidation resistance of ethers, limiting their energy density.
  • A new solid-state interface layer made from polyfluoroalkyl acrylate was created, enhancing the electrolyte's oxidation resistance from 4.3 V to 5.1 V and improving ionic conductivity significantly.
  • This innovative electrochemical process for developing the interface layer offers a promising method for building high-performance, high-energy-density solid-state batteries, potentially benefiting large-scale lithium battery production.

Article Abstract

Poly(ethylene oxide) (PEO)-based polymer electrolytes have been widely studied as a result of their flexibility, excellent interface contact, and high compatibility with a lithium metal anode. Owing to the poor oxidation resistance of ethers, however, the PEO-based electrolytes are only compatible with low-voltage cathodes, which limits their energy density. Here, a high-voltage stable solid-state interface layer based on polyfluoroalkyl acrylate was constructed via solvent-free bulk electropolymerization between the LiNiMnCoO (NCM811) cathode and the PEO-based solid polymer electrolyte. The electrochemical oxidation window of the as-synthesized electrolyte was therefore expanded from 4.3 V for the PEO-based matrix electrolyte to 5.1 V, and the ionic conductivity was improved to 1.02 × 10 S cm at ambient temperature and 4.72 × 10 S cm at 60 °C as a result of the improved Li migration. This fabrication process for the interface buffer layer by an electrochemical process provides an innovative and universal interface engineering strategy for high-performance and high-energy-density solid-state batteries, which has not been explicitly discussed before, paving the way toward the large-scale production of the next generation of solid-state lithium batteries.

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Source
http://dx.doi.org/10.1021/acsami.2c02731DOI Listing

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