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Title: Effects of Ultraviolet Light Treatment in Ambient Air on Lithium-Ion Battery Graphite and PVDF Binder

Abstract

In our prior study, ultraviolet (UV) light was used for the first time to improve long-term cycling of lithium-ion battery (LIB) electrodes. It was found that UV treatment of the anode resulted in thinner solid electrolyte interphase (SEI) layers, higher capacity retentions, and lower charge transfer resistance after cycling. In this paper, pristine graphite powders and polyvinylidene fluoride films (binder) with/without UV treatment were individually analyzed before cell assemblies. X-ray photoelectron spectroscopy (XPS) analysis showed a 300% increase in atomic percentage of oxygen on the graphite powder surfaces after UV treatment. However, fluorine level of the binder film decreased by more than 10%. The PVDF film also expanded in thickness by 3.7% after the UV treatment for 40 minutes, indicating scissions of the polymer backbones. The changes in PVDF weight, thickness, and fluorine atomic percentage from XPS peaks also indicated the release of fluorine containing gases (e.g., hydrogen fluoride and difluoroethylene gas) after crosslinking and scission of the PVDF. Although UV light was found to partially decompose PVDF in this study, it helped to increase oxygen level on the graphite, which, resulted in a thinner SEI layer, lower resistance, and eventually higher capacity retention as shown in our prior study.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1505018
Alternate Identifier(s):
OSTI ID: 1509550
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 166; Journal Issue: 6; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Batteries - Lithium; Surface Science; Lithium-ion battery; UV light; XPS

Citation Formats

An, Seong Jin, Li, Jianlin, Daniel, Claus, and Wood, III, David L. Effects of Ultraviolet Light Treatment in Ambient Air on Lithium-Ion Battery Graphite and PVDF Binder. United States: N. p., 2019. Web. doi:10.1149/2.0591906jes.
An, Seong Jin, Li, Jianlin, Daniel, Claus, & Wood, III, David L. Effects of Ultraviolet Light Treatment in Ambient Air on Lithium-Ion Battery Graphite and PVDF Binder. United States. doi:10.1149/2.0591906jes.
An, Seong Jin, Li, Jianlin, Daniel, Claus, and Wood, III, David L. Thu . "Effects of Ultraviolet Light Treatment in Ambient Air on Lithium-Ion Battery Graphite and PVDF Binder". United States. doi:10.1149/2.0591906jes.
@article{osti_1505018,
title = {Effects of Ultraviolet Light Treatment in Ambient Air on Lithium-Ion Battery Graphite and PVDF Binder},
author = {An, Seong Jin and Li, Jianlin and Daniel, Claus and Wood, III, David L.},
abstractNote = {In our prior study, ultraviolet (UV) light was used for the first time to improve long-term cycling of lithium-ion battery (LIB) electrodes. It was found that UV treatment of the anode resulted in thinner solid electrolyte interphase (SEI) layers, higher capacity retentions, and lower charge transfer resistance after cycling. In this paper, pristine graphite powders and polyvinylidene fluoride films (binder) with/without UV treatment were individually analyzed before cell assemblies. X-ray photoelectron spectroscopy (XPS) analysis showed a 300% increase in atomic percentage of oxygen on the graphite powder surfaces after UV treatment. However, fluorine level of the binder film decreased by more than 10%. The PVDF film also expanded in thickness by 3.7% after the UV treatment for 40 minutes, indicating scissions of the polymer backbones. The changes in PVDF weight, thickness, and fluorine atomic percentage from XPS peaks also indicated the release of fluorine containing gases (e.g., hydrogen fluoride and difluoroethylene gas) after crosslinking and scission of the PVDF. Although UV light was found to partially decompose PVDF in this study, it helped to increase oxygen level on the graphite, which, resulted in a thinner SEI layer, lower resistance, and eventually higher capacity retention as shown in our prior study.},
doi = {10.1149/2.0591906jes},
journal = {Journal of the Electrochemical Society},
number = 6,
volume = 166,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1149/2.0591906jes

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