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Title: Synergistic Effect of LiPF6 and LiBF4 as Electrolyte Salts in Lithium-Ion Cells

Journal Article · · Journal of the Electrochemical Society
 [1];  [2];  [3];  [4]
  1. Dalhousie Univ., Halifax (Canada). Dept. of Chemistry
  2. Dalhousie Univ., Halifax (Canada). Dept. of Physics and Atmospheric Science
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. Dalhousie Univ., Halifax (Canada). Dept. of Chemistry; Dalhousie Univ., Halifax (Canada). Dept. of Physics and Atmospheric Science
+ Show Author Affiliations

Recent work shows promise for LiBF4 as an electrolyte salt for high voltage lithium-ion batteries. LiBF4 is more hydrolytically stable than LiPF6, and in some cases has proved to be more stable at high voltage. This work shows that 1.0 M electrolytes consisting of equal parts LiBF4 and LiPF6 have better performance in certain high voltage (4.35 V) lithium-ion cells than electrolytes with LiPF6 or LiBF4 alone. This is shown using long-term cycling and ultra-high precision coulometry on lithium-ion cells, with and without electrolyte additives. Ultra-high precision coulometry showed that electrolyte with 1:1 LiPF6:LiBF4 and no other additives performed as well as electrolyte with LiPF6 and state-of-the-art additive blends in these cells. The synergism between LiPF6 and LiBF4 was explored using XPS, symmetric cells and EIS analysis. These show that LiBF4 reduces impedance growth at the positive electrode, while LiPF6 improves passivation at the negative electrode.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1469349
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 12 Vol. 164; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Effect of Substituting LiBF 4 for LiPF 6 in High Voltage Lithium-Ion Cells Containing Electrolyte Additives journal January 2016
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Interactions between Positive and Negative Electrodes in Li-Ion Cells Operated at High Temperature and High Voltage journal January 2016

Cited By (8)

Formulierung von Elektrolyten mit gemischten Lithiumsalzen für Lithium‐Batterien journal December 2019
Formulation of Blended‐Lithium‐Salt Electrolytes for Lithium Batteries journal December 2019
Long-term chemothermal stability of delithiated NCA in polymer solid-state batteries journal January 2019
The Effect of Methyl Acetate, Ethylene Sulfate, and Carbonate Blends on the Parasitic Heat Flow of NMC532/Graphite Lithium Ion Pouch Cells journal January 2018
Concentrated Dual-Salt Electrolyte to Stabilize Li Metal and Increase Cycle Life of Anode Free Li-Metal Batteries journal January 2019
Determining Parasitic Reaction Enthalpies in Lithium-Ion Cells Using Isothermal Microcalorimetry journal January 2018
Ion Association Constants for Lithium Ion Battery Electrolytes from First-Principles Quantum Chemistry journal January 2019
Long-Term Chemothermal Stability of Delithiated NCA in Polymer Solid-State Batteries text January 2019

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Related Subjects

25 ENERGY STORAGE
Li-ion cells
LiBF4
LiPF6
additives
electrolyte
high voltage
mixtures
synergy