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Title: Tris(trimethylsilyl) phosphite (TMSPi) and triethyl phosphite (TEPi) as electrolyte additives for lithium ion batteries: Mechanistic insights into differences during LiNi0.5Mn0.3Co0.2O2- Graphite full cell cycling

Abstract

Here, tris(trimethylsilyl) phosphite (TMSPi) has emerged as an useful electrolyte additive for lithium ion cells. This work examines the use of TMSPi and a structurally analogous compound, triethyl phosphite (TEPi), in LiNi0.5Mn0.3Co0.2O2-graphite full cells, containing a (baseline) electrolyte with 1.2 M LiPF6 in EC: EMC (3:7 w/w) and operating between 3.0-4.4 V. Galvanostatic cycling data reveal a measurable difference in capacity fade between the TMSPi and TEPi cells. Furthermore, lower impedance rise is observed for the TMSPi cells, because of the formation of a P-and O-rich surface film on the positive electrode that was revealed by X-ray photoelectron spectroscopy data. Elemental analysis on negative electrodes harvested from cycled cells show lower contents of transition metal (TM) elements for the TMSPi cells than for the baseline and TEPi cells. Our findings indicate that removal of TMS groups from the central P-O core of the TMSPi additive enables formation of the oxide surface film. This film is able to block the generation of reactive TM-oxygen radical species, suppress hydrogen abstraction from the electrolyte solvent, and minimize oxidation reactions at the positive electrode-electrolyte interface. In contrast, oxidation of TEPi does not yield a protective positive electrode film, which results in inferior electrochemical performance.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
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  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1372387
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 7; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 25 ENERGY STORAGE; 36 MATERIALS SCIENCE; electrolyte additive; high energy; high voltage; lithium-ion battery; oxide surface film; phosphite compound

Citation Formats

Peebles, Cameron, Sahore, Ritu, Gilbert, James A., Garcia, Juan C., Tornheim, Adam, Bareno, Javier, Iddir, Hakim, Liao, Chen, and Abraham, Daniel P. Tris(trimethylsilyl) phosphite (TMSPi) and triethyl phosphite (TEPi) as electrolyte additives for lithium ion batteries: Mechanistic insights into differences during LiNi0.5Mn0.3Co0.2O2- Graphite full cell cycling. United States: N. p., 2017. Web. doi:10.1149/2.1101707jes.
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Peebles, Cameron, Sahore, Ritu, Gilbert, James A., Garcia, Juan C., Tornheim, Adam, Bareno, Javier, Iddir, Hakim, Liao, Chen, & Abraham, Daniel P. Tris(trimethylsilyl) phosphite (TMSPi) and triethyl phosphite (TEPi) as electrolyte additives for lithium ion batteries: Mechanistic insights into differences during LiNi0.5Mn0.3Co0.2O2- Graphite full cell cycling. United States. https://doi.org/10.1149/2.1101707jes
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Peebles, Cameron, Sahore, Ritu, Gilbert, James A., Garcia, Juan C., Tornheim, Adam, Bareno, Javier, Iddir, Hakim, Liao, Chen, and Abraham, Daniel P. Sat . "Tris(trimethylsilyl) phosphite (TMSPi) and triethyl phosphite (TEPi) as electrolyte additives for lithium ion batteries: Mechanistic insights into differences during LiNi0.5Mn0.3Co0.2O2- Graphite full cell cycling". United States. https://doi.org/10.1149/2.1101707jes. https://www.osti.gov/servlets/purl/1372387.
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@article{osti_1372387,
title = {Tris(trimethylsilyl) phosphite (TMSPi) and triethyl phosphite (TEPi) as electrolyte additives for lithium ion batteries: Mechanistic insights into differences during LiNi0.5Mn0.3Co0.2O2- Graphite full cell cycling},
author = {Peebles, Cameron and Sahore, Ritu and Gilbert, James A. and Garcia, Juan C. and Tornheim, Adam and Bareno, Javier and Iddir, Hakim and Liao, Chen and Abraham, Daniel P.},
abstractNote = {Here, tris(trimethylsilyl) phosphite (TMSPi) has emerged as an useful electrolyte additive for lithium ion cells. This work examines the use of TMSPi and a structurally analogous compound, triethyl phosphite (TEPi), in LiNi0.5Mn0.3Co0.2O2-graphite full cells, containing a (baseline) electrolyte with 1.2 M LiPF6 in EC: EMC (3:7 w/w) and operating between 3.0-4.4 V. Galvanostatic cycling data reveal a measurable difference in capacity fade between the TMSPi and TEPi cells. Furthermore, lower impedance rise is observed for the TMSPi cells, because of the formation of a P-and O-rich surface film on the positive electrode that was revealed by X-ray photoelectron spectroscopy data. Elemental analysis on negative electrodes harvested from cycled cells show lower contents of transition metal (TM) elements for the TMSPi cells than for the baseline and TEPi cells. Our findings indicate that removal of TMS groups from the central P-O core of the TMSPi additive enables formation of the oxide surface film. This film is able to block the generation of reactive TM-oxygen radical species, suppress hydrogen abstraction from the electrolyte solvent, and minimize oxidation reactions at the positive electrode-electrolyte interface. In contrast, oxidation of TEPi does not yield a protective positive electrode film, which results in inferior electrochemical performance.},
doi = {10.1149/2.1101707jes},
journal = {Journal of the Electrochemical Society},
number = 7,
volume = 164,
place = {United States},
year = {Sat May 27 00:00:00 EDT 2017},
month = {Sat May 27 00:00:00 EDT 2017}
}
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https://doi.org/10.1149/2.1101707jes
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    Works referencing / citing this record:

    Scavenging Materials to Stabilize LiPF 6 ‐Containing Carbonate‐Based Electrolytes for Li‐Ion Batteries
    journal, November 2018

    Some Physical Properties of Ethylene Carbonate-Free Electrolytes
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    Preformed Anodes for High-Voltage Lithium-Ion Battery Performance: Fluorinated Electrolytes, Crosstalk, and the Origins of Impedance Rise
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    Decomposition of Phosphorus-Containing Additives at a Charged NMC Surface through Potentiostatic Holds
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    • Tornheim, Adam; Garcia, Juan C.; Sahore, Ritu
    • Journal of The Electrochemical Society, Vol. 166, Issue 4
    • DOI: 10.1149/2.0951902jes
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