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Title: Probing the Reaction between PVDF and LiPAA vs Li 7 Si 3 : Investigation of Binder Stability for Si Anodes

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0241912jes· OSTI ID:1568908

The chemical interaction of the highly reactive lithiated Si anode with other cell components, such as binders and electrolytes, is one of the most vital issues in batteries using Si electrodes. In this work, crystalline lithium silicide (LS) with Li7Si3 composition is synthesized to study the direct chemical reactions between the lithiated Si anodes and two typical binders, polyvinylidenefluoride (PVDF) and lithiated polyacrylic acid (LiPAA). The solid-state nuclear magnetic resonance (NMR) and Raman characterization experiments show that LiPAA binder is chemically stable against LS. On the contrary, PVDF binder reacts more readily with the LS, resulting in critical loss of Li from the bulk. 13C NMR shows the C-H bonds and C-C PVDF backbone were affected, whereas 19F MAS NMR shows the C-F bonds are relatively more stable. No LiF is detected, however HF release is confirmed by gas chromatography/mass spectrometry. The characterization results are consistent with electrochemical tests, which show the Si electrode using LiPAA as the binder has a much higher cyclability than when compared with PVDF. This work demonstrates the using of LS as an effective approach to evaluate and investigate the reactions between lithiated Si and different cell components, in order to stabilize Si anodes.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1568908
Alternate ID(s):
OSTI ID: 1550792
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Vol. 166 Journal Issue: 12; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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