Abstract
Dry processing is a promising method for high-performance and low-cost lithium-ion battery manufacturing which uses polytetrafluoroethylene (PTFE) as a binder. However, the electrochemical stability of the PTFE binder in the cathodes and the generated chemistry of the cathode electrolyte interphase (CEI) layers are rarely reported. Herein, the CEI properties and PTFE electrochemical stability are studied via cycling the high-loading dry-processed electrodes in electrolytes with LiPF6 or LiClO4 salt. Using LiClO4 salt can eliminate other possible F sources, allowing the decomposition of PTFE to be studied. The detection of LiF in cells with the LiClO4 salt confirms that PTFE undergoes side reaction(s) in the cathodes. When compared with LiClO4, the CEI layer is much thicker when LiPF6 is used as the electrolyte salt. These results provide insights into the CEI layer and may potentially enlighten the development of binders and electrolytes for the high efficiency and long durability of DP-based LIBs.
| Original language | English |
|---|---|
| Pages (from-to) | 40488-40495 |
| Number of pages | 8 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 15 |
| Issue number | 34 |
| DOIs | |
| State | Published - Aug 30 2023 |
Funding
This research at Oak Ridge National Laboratory (ORNL), managed by UT Battelle, LLC, for the US Department of Energy (DOE) under contract DE-AC05-00OR22725, was sponsored by the DOE Advanced Materials and Manufacturing Technologies Office (DE-EE0009109). The XRD and SEM experiments were performed at the Center for Nanophase Materials Sciences at ORNL, which is a DOE Office of Science User Facility. X.-G.S. was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract number DE-AC05-00OR22725. The authors thank Cabot Corporation and Arkema for their material and technical assistance, respectively, and Dr. Jong K. Keum for his valuable assistance on the setting of the XRD instrument. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or to allow others to do so, for United States Government purposes. The DOE will provide public access to these results of federally sponsored research under the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). This research at Oak Ridge National Laboratory (ORNL), managed by UT Battelle, LLC, for the US Department of Energy (DOE) under contract DE-AC05-00OR22725, was sponsored by the DOE Advanced Materials and Manufacturing Technologies Office (DE-EE0009109). The XRD and SEM experiments were performed at the Center for Nanophase Materials Sciences at ORNL, which is a DOE Office of Science User Facility. X.-G.S. was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract number DE-AC05-00OR22725. The authors thank Cabot Corporation and Arkema for their material and technical assistance, respectively, and Dr. Jong K. Keum for his valuable assistance on the setting of the XRD instrument. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or to allow others to do so, for United States Government purposes. The DOE will provide public access to these results of federally sponsored research under the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).
Keywords
- CEI layer
- PTFE binder
- cathode
- dry processing
- high loading
- lithium-ion battery
- side reactions
