Lithium Tetrafluoroborate as an Electrolyte Additive to Improve the High Voltage Performance of Lithium-Ion Battery

Zuo, Xiaoxi; Fan, Cheng-Jie; Liu, Jiansheng; Xiao, Xin; Wu, Jiahui; Nan, Junmin

doi:10.1149/2.066308jes

Cited by 68 publications

(65 citation statements)

References 29 publications

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“…Peak assignments are based on LiPF6, Li2CO3, and LiF reference powders and various literature reports. 16,[26][27][28] Soft XAS measurements were performed in total electron yield (TEY) mode at beamline I09 at the DLS at the same time as HAXPES measurements. Additionally, XAS measurements in surface-sensitive TEY mode and bulk sensitive total fluorescence yield (TFY) mode were performed at beamline 8.0.1 at the Advanced Light Source (ALS) at the Lawrence Berkeley National Laboratory (LBNL).…”

Section: Methodsmentioning

confidence: 99%

Evolution of the Electrode–Electrolyte Interface of LiNi_0.8Co_0.15Al_0.05O₂ Electrodes Due to Electrochemical and Thermal Stress

et al. 2018

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For layered oxide cathodes, impedance growth and capacity fade related to reactions at the cathode-electrolyte interface (CEI) are particularly prevalent at high voltage and high temperatures. At a minimum, the CEI layer consists of Li2CO3, LiF, reduced (relative to the bulk) metal-ion species, and salt decomposition species but conflicting reports exist regarding their progression during (dis)charging. Utilizing transport measurements in combination with x-ray and nuclear magnetic resonance spectroscopy techniques, we study the evolution of these CEI species as a function of electrochemical and thermal stress for LiNi0.8Co0.15Al0.05O2 (NCA) particle electrodes using a LiPF6 ethylene carbonate: dimethyl carbonate (1:1 volume ratio) electrolyte. Although initial surface metal reduction does correlate with surface Li2CO3 and LiF, these species are found to decompose upon charging and are absent above 4.25 V. While there is trace LiPF6 breakdown at room temperature above 4.25 V, thermal aggravation is found to strongly promote salt breakdown and contributes to surface degradation even at lower voltages (4.1 V). An interesting finding of our work was the partial reformation of LiF upon discharge which warrants further consideration for understanding CEI stability during cycling.

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Section: Methodsmentioning

confidence: 99%

Evolution of the Electrode–Electrolyte Interface of LiNi_0.8Co_0.15Al_0.05O₂ Electrodes Due to Electrochemical and Thermal Stress

et al. 2018

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“…3,[12][13][14][15][16][17] LiBF 4 has demonstrated several other important advantages over LiPF 6 : improved performance at sub-zero temperatures, improved passivation of the Al current collector, and improved performance at the positive electrode. 1,[3][4][5][6][7][8][9][12][13][14]17 The disadvantages of LiBF 4 are lower conductivity compared to LiPF 6 and poor performance at the negative electrode. 13,16 Our previous work explored the use of LiBF 4 in machine-made, high voltage, lithium-ion pouch cells.…”

mentioning

confidence: 99%

Synergistic Effect of LiPF₆and LiBF₄as Electrolyte Salts in Lithium-Ion Cells

Ellis

Hill

Gering

et al. 2017

J. Electrochem. Soc.

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Recent work shows promise for LiBF 4 as an electrolyte salt for high voltage lithium-ion batteries. LiBF 4 is more hydrolytically stable than LiPF 6 , 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 LiBF 4 and LiPF 6 have better performance in certain high voltage (4.35 V) lithium-ion cells than electrolytes with LiPF 6 or LiBF 4 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 LiPF 6 :LiBF 4 and no other additives performed as well as electrolyte with LiPF 6 and state-of-the-art additive blends in these cells. The synergism between LiPF 6 and LiBF 4 was explored using XPS, symmetric cells and EIS analysis. These show that LiBF 4 reduces impedance growth at the positive electrode, while LiPF 6 improves passivation at the negative electrode.

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“…The fluoride-free alternative salt, LiClO 4 , exhibits comparable properties to LiPF 6 , and it is not sensitive to moisture and has no toxic decomposition products; however, there is a severe risk of explosion due to the high oxidizability of ClO 4 − and interaction with organic compounds. Thus, researchers pay more attention to developing novel lithium salts such as lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) [180], lithium bis(fluorosulfonyl) imide (LiFSI) [181,182], lithium bis(oxalate)borate (LiBOB) [183], lithium difluoro(oxalate) borate (LiODFB) [184] and lithium bis(fluorosulfonyl) amide [185].…”

Section: Electrolyte Materialsmentioning

confidence: 99%

Building Safe Lithium-Ion Batteries for Electric Vehicles: A Review

Duan

Tang

Dai

et al. 2019

Electrochem. Energ. Rev.

493

260

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Lithium-ion batteries (LIBs), with relatively high energy density and power density, have been considered as a vital energy source in our daily life, especially in electric vehicles. However, energy density and safety related to thermal runaways are the main concerns for their further applications. In order to deeply understand the development of high energy density and safe LIBs, we comprehensively review the safety features of LIBs and the failure mechanisms of cathodes, anodes, separators and electrolyte. The corresponding solutions for designing safer components are systematically proposed. Additionally, the in situ or operando techniques, such as microscopy and spectrum analysis, the fiber Bragg grating sensor and the gas sensor, are summarized to monitor the internal conditions of LIBs in real time. The main purpose of this review is to provide some general guidelines for the design of safe and high energy density batteries from the views of both material and cell levels.

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Lithium Tetrafluoroborate as an Electrolyte Additive to Improve the High Voltage Performance of Lithium-Ion Battery

Cited by 68 publications

References 29 publications

Evolution of the Electrode–Electrolyte Interface of LiNi_0.8Co_0.15Al_0.05O₂ Electrodes Due to Electrochemical and Thermal Stress

Evolution of the Electrode–Electrolyte Interface of LiNi_0.8Co_0.15Al_0.05O₂ Electrodes Due to Electrochemical and Thermal Stress

Synergistic Effect of LiPF₆and LiBF₄as Electrolyte Salts in Lithium-Ion Cells

Building Safe Lithium-Ion Batteries for Electric Vehicles: A Review

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Lithium Tetrafluoroborate as an Electrolyte Additive to Improve the High Voltage Performance of Lithium-Ion Battery

Cited by 68 publications

References 29 publications

Evolution of the Electrode–Electrolyte Interface of LiNi0.8Co0.15Al0.05O2 Electrodes Due to Electrochemical and Thermal Stress

Evolution of the Electrode–Electrolyte Interface of LiNi0.8Co0.15Al0.05O2 Electrodes Due to Electrochemical and Thermal Stress

Synergistic Effect of LiPF6and LiBF4as Electrolyte Salts in Lithium-Ion Cells

Building Safe Lithium-Ion Batteries for Electric Vehicles: A Review

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Evolution of the Electrode–Electrolyte Interface of LiNi_0.8Co_0.15Al_0.05O₂ Electrodes Due to Electrochemical and Thermal Stress

Evolution of the Electrode–Electrolyte Interface of LiNi_0.8Co_0.15Al_0.05O₂ Electrodes Due to Electrochemical and Thermal Stress

Synergistic Effect of LiPF₆and LiBF₄as Electrolyte Salts in Lithium-Ion Cells