Lithium Difluoro(Oxalate)Borate (LiDFOB) has shown potential to be a powerful electrolyte additive to improve lithium-ion battery performance by decreasing the decomposition of the electrolyte.
Lithium difluorooxalatoborate (LIODFB) is a salt for researching high-performance Li-ion batteries with improved cycle life; power capability; low temperature and high rate performance of the battery. It has the advantages of both lithium bis(oxalato)borate (LiBOB) and LiBF4. https://www.scbt.com/p/lithium-difluoro-oxalato-borate-409071-16-5
Tesla INC has a patent pending titled: “Electrolytes with lithium difluoro(oxalato)borate and lithium tetrafluoroborate salts for lithium metal and anode-free cells” https://patents.google.com/patent/US20200220220A1
Influence of Lithium Difluoro (Oxalato) Borate Additive on the Performance of LiCoPO4−LiFePO4 Solid-Solution by Carbothermal Reduction ChemElectroChem, Chemistry Europe, European Chemical Societies Publishing Volume9, Issue19 October 14, 2022 https://doi.org/10.1002/celc.202200815
Additives for High Performance Cathodes: Our work reports the carbothermal synthesis of LiCoPO4−LiFePO4 solid solution which is used as a cathode for LIB. The use of LiDFOB as an electrolyte additive enhanced the stability of SEI and thereby improved the electrochemical performance of the cell. Full-cell analysis with Li4Ti5O12 anode has also been conducted.
We report the effect of lithium difluoro (oxalato) borate (LiDFOB) additive on the electrochemical performance of LiFe0.5Co0.5PO4@C, along with the fabrication of a full-cell with Li4Ti5O12 (LTO) anode.
Here, we used a scalable carbothermal reduction for the synthesis of LiCoPO4−LiFePO4 solid-solution, LiFe0.5Co0.5PO4@C.
The electrochemical activity of LiFe0.5Co0.5PO4@C cathode is studied by varying LiDFOB (up to 2 wt%) concentration and showed significant improvement compared to the normal electrolyte in half-cell assembly.
Among the various concentrations of LiDFOB, 1.5 and 2 wt% additions are optimized owing to the higher discharge capacity of 114 and 116 mAh g−1 with a capacity retention of 65 and 73 % after 60 cycles, respectively.
The Li+ ion diffusion coefficients are calculated from both cyclic voltammetry and impedance spectroscopy analysis and show a decrease in the value as the concentration of LiDFOB is increased from 0.5 to 2 wt%, with an order of magnitude in the range of ∼10−14 cm2 s−1.
The full-cell, LiFe0.5Co0.5PO4@C/LTO is also fabricated and displayed a discharge capacity of 95 mAh g−1.
The possibility of using such full-cell assembly with various temperature conditions is studied from −10 to 25 °C.
Cyclability improvement of high voltage lithium cobalt oxide/graphite battery by use of lithium difluoro(oxalate)borate electrolyte additive Electrochimica Acta Volume 426, 10 September 2022, 140783 https://doi.org/10.1016/j.electacta.2022.140783
In order to overcome severe capacity fading of LiCoO2/graphite lithium-ion battery at a high voltage, lithium difluoro(oxalate)borate (LiDFOB) was investigated as an electrolyte additive.
Electrochemical tests demonstrate that by adding 1 wt.% LiDFOB into a carbonate electrolyte, the capacity retention of the battery after 300 cycles at 1 C between 3.0 and 4.5 V is improved from 42.1 to 80.2%.
With the help of computational calculations and physical characterization techniques, we found that the LiDFOB strongly coordinates with Co ions, which inhibits the dissolution of cobalt from bulk LiCoO2 and prevents Co deposition on the anode.
Meanwhile, the LiDFOB additive form stable, uniform, and thin surface films simultaneously on positive and negative of the LiCoO2/graphite battery, inhibiting the electrolyte decomposition and leading to the improvement of the batteries performance.
A safe electrolyte for high-performance lithium-ion batteries containing lithium difluoro(oxalato)borate, gamma-butyrolactone and non-flammable hydrofluoroether Electrochimica Acta Volume 394, 20 October 2021, 139120 https://doi.org/10.1016/j.electacta.2021.139120
A new electrolyte with ideal wettability for lithium-ion batteries is proposed.
Non-flammability and high flash point of electrolyte indicate its high safety.
A safe electrolyte of lithium difluoro(oxalato)borate in the mixture of gamma-butyrolactone and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether is initially proposed in this work.
This electrolyte owns higher safety level and better wettability than a commercial electrolyte.
Insights into the Dual Role of Lithium Difluoro(oxalato)borate Additive in Improving the Electrochemical Performance of NMC811||Graphite Cells ACS Appl. Energy Mater. 2020, 3, 1, 695–704 Publication Dateecember 13, 2019 https://doi.org/10.1021/acsaem.9b01894
Ni-rich layered oxides (LiNixMnyCozO2, x ≥ 0.6, x + y + z = 1) are promising positive electrode materials for high energy density lithium-ion batteries thanks to their high specific capacity.
However, large-scale application of Ni-rich layered oxides is hindered by its poor structural and interfacial stability, especially during cycling at a high cutoff potential (i.e., ≥ 4.3 V, versus Li+/Li).
Herein, we demonstrate that lithium difluoro(oxalato)borate (LiDFOB) as a film-forming additive plays a dual role on the electrode|electrolyte interphase formation in a LiNi0.83Mn0.05Co0.12O2||graphite cell, meaning that it can not only be reduced on the graphite negative electrode but also oxidized on the nickel-rich oxide LiNi0.83Mn0.05Co0.12O2 positive electrode cycled at a high cutoff potential (4.4 V, versus Li+/Li) prior to typical carbonate-based electrolyte constituents.
As a result, the addition of 1.5 wt % LiDFOB greatly reduces the polarization and improves the cycling stability of the LiNi0.83Mn0.05Co0.12O2||graphite cell, which shows a high discharge capacity of 198 mA h g–1, and more than 83.1% of the initial capacity was retained after 200 cycles at C/3 (the capacity retention obtained at the same cycling condition is only 59.9% for the cell without LiDFOB additive).
Furthermore, the employ of LiDFOB additive also significantly suppresses the self-discharge of the LiNi0.83Mn0.05Co0.12O2||Li cell during high-temperature and long-term room-temperature storage at 4.4 V.
These electrochemical performance enhancements could be attributed to the participation of LiDFOB in forming a stable and Li+ transfer favorable protective layer that is rich in inorganic boron, fluorine, and carbonate compounds on both the surface of the LiNi0.83Mn0.05Co0.12O2 positive electrode and the graphite negative electrode, thus suppressing the electrolyte decomposition on the positive electrode and negative electrode surfaces and decreasing the dissolution of transition-metal ions from the positive electrode bulk.
Investigation and application of lithium difluoro(oxalate)borate (LiDFOB) as additive to improve the thermal stability of electrolyte for lithium-ion batteries Journal of Power Sources Volume 196, Issue 16, 15 August 2011, Pages 6794-6801 https://doi.org/10.1016/j.jpowsour.2010.10.050
Lithium difluoro (oxalate) borate (LiDFOB) is used as thermal stabilizing and solid electrolyte interface (SEI) formation additive for lithium-ion battery.
The enhancements of electrolyte thermal stability and the SEIs on graphite anode and LiFePO4 cathode with LiDFOB addition are investigated via a combination of electrochemical methods, nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared-attenuated total reflectance (FTIR-ATR), as well as density functional theory (DFT).
It is found that cells with electrolyte containing 5% LiDFOB have better capacity retention than cells without LiDFOB.
This improved performance is ascribed to the assistance of LiDFOB in forming better SEIs on anode and cathode and also the enhancement of the thermal stability of the electrolyte. LiDFOB-decomposition products are identified experimentally on the surface of the anode and cathode and supported by theoretical calculations.
Lithium difluoro(oxalato)borate Market Share & Trends Analysis, By Grade (Battery Grade, Electron Grade, Industrial Grade), By Form (Solid, Gel, Liquid) & By Region - Global Market Insights 2021 to 2031
According to the latest research by Fact MR., lithium difluoro(oxalato)borate market is set to register sizeable growth during 2021-2031 with a CAGR of 7.8%. Demand for the lithium difluoro(oxalato)borate will witness substantial growth recovery in the short term, with an optimistic growth outlook in the long run.
An upsurge in demand from the electric vehicle industry will generate extensive growth opportunities in near future. Besides, sales of Lithium difluoro(oxalate)borate in the electronics industry will provide momentum.
Upsurge in the use of consumer electronics, such as, smartphones, laptops and other portable equipment is driving the market demand for lithium-ion batteries which in turn increasing the demand for battery electrolytes.
Lithium difluoro(oxalato)borate is a high-performance lithium-ion battery material, so with the increased demand for battery electrolytes, the demand for LiDFOB is increasing.
It is predicted that the global demand for lithium batteries will increase from 271 GWh in 2020 to 1000 GWh in 2025, with an average compound growth rate of about 29%. The demand for lithium-ion battery electrolytes reaches 1 million tons yearly, and the demand for lithium battery additives, one of the key materials of lithium-ion battery electrolytes, will also increase rapidly over the forecast years.
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ecember 13, 2019
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