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

Abstract

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.

Authors:

Han, Binghong ;

• Search DOE PAGES for author "Han, Binghong"
• Search DOE PAGES for ORCID "0000-0002-2919-3235"

Piernas-Muñoz, Maria Jose; Dogan, Fulya; Kubal, Joseph; Trask, Stephen E. ;

• Search DOE PAGES for author "Trask, Stephen E."
• Search DOE PAGES for ORCID "0000-0002-0879-4779"

Bloom, Ira D. ;

• Search DOE PAGES for author "Bloom, Ira D."
• Search DOE PAGES for ORCID "0000-0002-4877-473X"

Vaughey, John T. ;

• Search DOE PAGES for author "Vaughey, John T."
• Search DOE PAGES for ORCID "0000-0002-2556-6129"

Key, Baris

Publication Date:

Fri Jul 05 00:00:00 EDT 2019

Research Org.:

Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Org.:

USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO); USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1568908

Alternate Identifier(s):

OSTI ID: 1550792

Grant/Contract Number:  

AC02-06CH11357

Resource Type:

Published Article

Journal Name:

Journal of the Electrochemical Society

Additional Journal Information:

Journal Name: Journal of the Electrochemical Society Journal Volume: 166 Journal Issue: 12; Journal ID: ISSN 0013-4651

Publisher:

The Electrochemical Society

Country of Publication:

United States

Language:

English

Subject:

25 ENERGY STORAGE; Batteries; Silicon; Binder; Lithium Silicide; Silicon Anode