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Evaluating electrolyte additives for lithium-ion cells: A new Figure of Merit approach

Journal Article · · Journal of Power Sources
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  1. Argonne National Lab. (ANL), Argonne, IL (United States)
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Electrolyte additives are known to improve the performance of lithium-ion cells. In this work we examine the performance of Li1.03Ni0.5Mn0.3Co0.3O2-graphite (NMC532/Gr) cells containing combinations of lithium bis(oxalate)borate (LiBOB), vinylene carbonate (VC), trivinylcyclotriboroxane (tVCBO), prop-1-ene-1,3-sultone (PES), phenyl boronic acid ethylene glycol ester (PBE), tris(trimethylsilyl) phosphite (TMSPi), triethylphosphite (TEPi), and lithium difluoro(oxalate)borate (LiDFOB) added to our baseline (1.2M LiPF6 in EC:EMC, 3:7 w/w) electrolyte. In order to rank performance of the various electrolytes, we developed two separate figures of merit (FOM), which are based on the energy retention and power retention of the cells. Using these two metrics in conjunction, we show that only one of the fifteen electrolyte formulations tested significantly outperforms the baseline electrolyte: this electrolyte contains the 0.25 wt% tVCBO + 1 wt% TMSPi additive mix. Little correlation was observed between the FOMs for energy retention and power retention, which indicates that the mechanisms that govern these performance parameters are likely independent of each other. In conclusion, our FOM approach has general applicability and can be used to develop electrolyte and electrode formulations that prolong the life of lithium-ion batteries.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1393196
Alternate ID(s):
OSTI ID: 1495799
Journal Information:
Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: C Vol. 365; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Composition and Impedance Heterogeneity in Oxide Electrode Cross-Sections Detected by Raman Spectroscopy journal February 2018
Effects of Charge Cutoff Potential on an Electrolyte Additive for LiNi 0.6 Co 0.2 Mn 0.2 O 2 –Mesocarbon Microbead Full Cells journal March 2019
Methyl 2,2‐Difluoro‐2‐(Fluorosulfonyl) Acetate as a Novel Electrolyte Additive for High‐Voltage LiCoO 2 /Graphite Pouch Li‐Ion Cells journal January 2020
Preformed Anodes for High-Voltage Lithium-Ion Battery Performance: Fluorinated Electrolytes, Crosstalk, and the Origins of Impedance Rise journal January 2018

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Related Subjects

25 ENERGY STORAGE
capacity fade
energy density
impedance rise
lithium-ion
power density