Stable Cycling with Intimate Contacts Enabled by Crystallinity–Controlled PTFE–Based Solvent–Free Cathodes in All–Solid–State Batteries

Lee, Dongsoo; Manthiram, Arumugam

doi:10.1002/smtd.202201680

Stable Cycling with Intimate Contacts Enabled by Crystallinity–Controlled PTFE–Based Solvent–Free Cathodes in All–Solid–State Batteries

Journal Article · Tue Apr 25 00:00:00 EDT 2023 · Small Methods

DOI:https://doi.org/10.1002/smtd.202201680· OSTI ID:2217458

Lee, Dongsoo ^[1]; ^[2]

University of Texas at Austin, TX (United States); University of Texas at Austin
University of Texas at Austin, TX (United States)

All-solid-state batteries (ASSBs) employing Li-metal anodes and inorganic solid electrolytes are attracting great attention due to high safety and energy density for next-generation energy storage devices. However, the volume change of cathode active materials can cause contact loss, resulting in charge carrier isolation, heterogeneous current distribution, and poor electrochemical properties in ASSBs. Here, a simple, yet effective, solvent-free electrode engineering approach with polytetrafluoroethylene (PTFE) as a binder for ASSBs is reported, enabling intimate contact and stable interfaces with the cathode. It is substantiated that the crystallinity of PTFE can be controlled depending on the heat history, and highly crystalline PTFE displays robust mechanical properties. High-nickel LiNi_0.8Mn_0.1Co_0.1O₂ cathode prepared with crystalline PTFE show improved cycle and rate performances in ASSBs. In addition, it is revealed that the intimate contact between cathode particles with a stable cathode electrolyte layer is maintained during cycling by postmortem studies. Furthermore, this simple engineering method can be applied to prepare cathodes with a variety of active materials and solid electrolytes in ASSBs.

View Accepted Manuscript (DOE)

Research Organization:: University of Texas at Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)

Grant/Contract Number:: EE0007762

OSTI ID:: 2217458

Journal Information:: Small Methods, Journal Name: Small Methods Journal Issue: 7 Vol. 7; ISSN 2366-9608

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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