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Title: Daikin Advanced Lithium Ion Battery Technology – High Voltage Electrolyte - REVISED

Abstract

An evaluation of high voltage electrolytes which contain fluorochemicals as solvents/additive has been completed with the objective of formulating a safe, stable electrolyte capable of operation to 4.6 V. Stable cycle performance has been demonstrated in LiNi1/3Mn1/3Co1/3O2 (NMC111)/graphite cells to 4.5 V. The ability to operate at high voltage results in significant energy density gain (>30%) which would manifest as longer battery life resulting in higher range for electric vehicles. Alternatively, a higher energy density battery can be made smaller without sacrificing existing energy. In addition, the fluorinated electrolytes examined showed better safety performance when tested in abuse conditions. The results are promising for future advanced battery development for vehicles as well as other applications.

Authors:
 [1];  [1]
  1. Daikin America, Inc., Orangeburg, NY (United States)
Publication Date:
Research Org.:
Daikin America, Inc., Orangeburg, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1345663
Report Number(s):
DOE-DAI-0006437-R
DOE Contract Number:
EE0006437
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE

Citation Formats

Sunstrom, Joseph, and Hendershot, Ron E. Daikin Advanced Lithium Ion Battery Technology – High Voltage Electrolyte - REVISED. United States: N. p., 2017. Web. doi:10.2172/1345663.
Sunstrom, Joseph, & Hendershot, Ron E. Daikin Advanced Lithium Ion Battery Technology – High Voltage Electrolyte - REVISED. United States. doi:10.2172/1345663.
Sunstrom, Joseph, and Hendershot, Ron E. Mon . "Daikin Advanced Lithium Ion Battery Technology – High Voltage Electrolyte - REVISED". United States. doi:10.2172/1345663. https://www.osti.gov/servlets/purl/1345663.
@article{osti_1345663,
title = {Daikin Advanced Lithium Ion Battery Technology – High Voltage Electrolyte - REVISED},
author = {Sunstrom, Joseph and Hendershot, Ron E.},
abstractNote = {An evaluation of high voltage electrolytes which contain fluorochemicals as solvents/additive has been completed with the objective of formulating a safe, stable electrolyte capable of operation to 4.6 V. Stable cycle performance has been demonstrated in LiNi1/3Mn1/3Co1/3O2 (NMC111)/graphite cells to 4.5 V. The ability to operate at high voltage results in significant energy density gain (>30%) which would manifest as longer battery life resulting in higher range for electric vehicles. Alternatively, a higher energy density battery can be made smaller without sacrificing existing energy. In addition, the fluorinated electrolytes examined showed better safety performance when tested in abuse conditions. The results are promising for future advanced battery development for vehicles as well as other applications.},
doi = {10.2172/1345663},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 06 00:00:00 EST 2017},
month = {Mon Mar 06 00:00:00 EST 2017}
}

Technical Report:

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  • A new class of electrolyte additives based on cyclic fluorinated phosphate esters was rationally designed and identified as being able to stabilize the surface of a LiNi0.5Mn0.3Co0.2O2 (NMC532) cathode when cycled at potentials higher than 4.6 V vs Li+/Li. Cyclic fluorinated phosphates were designed to incorporate functionalities of various existing additives to maximize their utilization. The synthesis and characterization of these new additives are described and their electrochemical performance in a NMC532/graphite cell cycled between 4.6 and 3.0 V are investigated. With 1.0 wt % 2-(2,2,2-trifluoroethoxy)-1,3,2-dioxaphospholane 2-oxide (TFEOP) in the conventional electrolyte the NMC532/graphite cell exhibited much improved capacity retentionmore » compared to that without any additive. The additive is believed to form a passivation layer on the surface of the cathode via a sacrificial polymerization reaction as evidenced by X-ray photoelectron spectroscopy (XPS) and nuclear magnetic resonsance (NMR) analysis results. The rational pathway of a cathode-electrolyte-interface formation was proposed for this type of additive. Both experimental results and the mechanism hypothesis suggest the effectiveness of the additive stems from both the polymerizable cyclic ring and the electron-withdrawing fluorinated alkyl group in the phosphate molecular structure. The successful development of cyclic fluorinated phosphate additives demonstrated that this new functionality selection principle, by incorporating useful functionalities of various additives into one molecule, is an effective approach for the development of new additives.« less
  • This report describes the experimental results obtained in the development of a high rate lithium, thionyl chloride battery system. Initially, cell optimization studies were conducted with so-called neutral electrolyte, i.e., thionyl chloride containing equimolar quantities of LiCl and AlCl/sup 3/. This report is divided into four sections, Section I - Cell Performance in Neutral Electrolyte, Section II - Cell Performance in Acid Electrolyte, Section III - Discussions of Battery Characteristics and Section IV - Active Battery Considerations.