二氟草酸硼酸锂(LiODFB)的制备及其在碳酸二甲酯中的相图和离子缔合规律

Zhou, Hongming; Xiao, Kaiwen; Li, Jian; Xiao, Demin; Jiang, Yi-xiong

doi:10.1007/s11771-018-3760-5

Cited by 10 publications

(1 citation statement)

References 34 publications

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“…In the FT‐IR spectra, the OBO stretching vibration peak of DFOB − appears at 718 cm −1 in LiDFOB salt, manifesting stronger coordination interaction between DFOB − and Li + . [ 24 ] The peak locates at 708 cm −1 in 1m‐DE owing to the dissociation of LiDFOB salt. The peak shifts to higher wavelength in 3m‐DE and 2.4m‐DEF, indicating the coordination of DFOB − and Li + is enhanced ( Figure a).…”

Section: Resultsmentioning

confidence: 99%

High‐Energy‐Density Lithium Metal Batteries with Impressive Li⁺ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

Han

Wang

Huang

et al. 2023

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temperature range between −20 and 55 °C. [3][4][5] Especially LIBs hardly work when the temperature is below −30 °C because of commercial carbonate electrolytes, which often include LiPF 6 salt, cyclic ethylene carbonate (EC), and linear carbonate solvents (such as dimethyl carbonate (DMC), diethyl carbonate (DEC)). The commercial carbonate electrolytes usually exhibit high freezing points and high viscosity at low temperature, resulting in sluggish Li + transport and charge transfer kinetics at low temperature. [6][7][8] This severely limits their application in electric vehicles, defense applications, and space exploration. The requirements for developing high-energydensity and wide-temperature energy storage devices become very urgent. [9,10] To improve energy density, lithium (Li) metal batteries (LMBs) containing Li metal anode and nickel (Ni)-rich LiNi x Co y Mn z O 2 (x ≥ 0.9) cathode have attracted extensive attention due to low electrochemical potential of Li metal (−3.04 V compared to standard hydrogen electrode) and high specific capacity (3860 mA h g −1 of Li metal, >200 mA h g −1 of LiNi 0.9 Co 0.05 Mn 0.05 O 2 ). [11][12][13] However, LiPF 6 salt is easily decomposed to produce HF and carbonate solvents are continuously oxidized/reduced at electrode/electrolyte interface, which will cause serious corrosion to Ni-rich cathode and Li metal anode. [14] As a result, during the cycling process, Li dendrites High-energy-density Li metal batteries (LMBs) with Nickel (Ni)-rich cathode and Li-metal anode have attracted extensive attention in recent years. However, commercial carbonate electrolytes bring severe challenges including poor cycling stability, severe Li dendrite growth and cathode cracks, and narrow operating temperature window, especially hardly work at below −40 °C. In this work, a 2.4 m lithium difluoro(oxalato)borate (LiDFOB) in ethyl acetate (EA) solvent with 20 wt% fluorocarbonate (FEC) (named 2.4m-DEF) is designed to solve Li + transport dynamic at low temperature and improve interfacial stability between electrolyte with Li anode or Ni-rich cathode. Beneficial lower freezing point, lower viscosity, and higher dielectric constant of EA solvent, the electrolyte exhibits excellent Li + transport dynamic. Relying on the unique Li + solvation structure, more DFOB − anions and FEC solvents are decomposed to establish a stable solid electrolyte interface at electrolyte/ electrode. Therefore, LiNi 0.9 Co 0.05 Mn 0.05 O 2 (NCM90)/Li LMB with 2.4m-DEF enables excellent rate capability (184 mA h g −1 at 30 C) and stable cycling performance with ≈93.7% of capacity retention after 200 cycles at 20 C and room temperature. Moreover, the NCM90/Li LMB with 2.4m-DEF exhibits surprising ultra-low-temperature performance, showing 173 mA h g −1 at −40 °C and 152 mA h g −1 at −60 °C, respectively.

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Section: Resultsmentioning

confidence: 99%

High‐Energy‐Density Lithium Metal Batteries with Impressive Li⁺ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

Han

Wang

Huang

et al. 2023

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Wide-temperature range and high safety electrolytes for high-voltage Li-metal batteries

et al. 2022

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The double-sided roles of difluorooxalatoborate contained electrolyte salts in electrochemical energy storage devices: A review

Li,

Wang,

Luo

et al. 2024

Chinese Chemical Letters

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二氟草酸硼酸锂(LiODFB)的制备及其在碳酸二甲酯中的相图和离子缔合规律

Cited by 10 publications

References 34 publications

High‐Energy‐Density Lithium Metal Batteries with Impressive Li⁺ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

High‐Energy‐Density Lithium Metal Batteries with Impressive Li⁺ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

Wide-temperature range and high safety electrolytes for high-voltage Li-metal batteries

The double-sided roles of difluorooxalatoborate contained electrolyte salts in electrochemical energy storage devices: A review

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二氟草酸硼酸锂(LiODFB)的制备及其在碳酸二甲酯中的相图和离子缔合规律

Cited by 10 publications

References 34 publications

High‐Energy‐Density Lithium Metal Batteries with Impressive Li+ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

High‐Energy‐Density Lithium Metal Batteries with Impressive Li+ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

Wide-temperature range and high safety electrolytes for high-voltage Li-metal batteries

The double-sided roles of difluorooxalatoborate contained electrolyte salts in electrochemical energy storage devices: A review

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Product

Resources

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High‐Energy‐Density Lithium Metal Batteries with Impressive Li⁺ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

High‐Energy‐Density Lithium Metal Batteries with Impressive Li⁺ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C