Dual-additives enable stable electrode-electrolyte interfaces for long life Li-SPAN batteries

Guo, Zhenqiang; Qian, Wei; Xu, Shengjun; Hu, Guofeng; Bai, Shuo; Li, Feng

doi:10.1016/j.cclet.2023.108622

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…Considerable efforts have been devoted to using FEC-based electrolytes for generating fluorinated SEIs in Li-based batteries, particularly with the graphite anodes or Li metal anodes. ,− The FEC-derived fluorinated SEI is characteristic of a high LiF amount, which exhibits low electronic conductivity (∼10 –31 S cm –1 ) and a high Young’s modulus (∼64.9 GPa) . Unfortunately, the low Li + conductivity of the LiF (∼10 –12 S cm –1 ) component largely restricts the fast charging capability especially for Li metal anodes as a result of the blocked transportation ability of Li + and further aggravated Li dendrite growth at high current rates (e.g., above 2.0 mAh cm –2 ). − Very recently, a dual-anion-regulated electrolyte was designed by Xu’s research group via using LiTFSI and LiDFBOP as anion regulators . The TFSI – anion reduced the desolvation energy of Li + , while the DFBOP – anion promoted the formation of highly ion conductive and robust inorganic-rich interphases on both cathodes (less LiF and stronger Li x PO y F z ) and anodes (large amounts of Li x PO y F z and Li 2 C 2 O 4 ).…”

Section: Understanding Fluorinated Interphases In Li-based Batteriesmentioning

confidence: 99%

Fluorine Chemistry in Rechargeable Batteries: Challenges, Progress, and Perspectives

Wang,

Yang,

Meng

et al. 2024

Chem. Rev.

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The renewable energy industry demands rechargeable batteries that can be manufactured at low cost using abundant resources while offering high energy density, good safety, wide operating temperature windows, and long lifespans. Utilizing fluorine chemistry to redesign battery configurations/components is considered a critical strategy to fulfill these requirements due to the natural abundance, robust bond strength, and extraordinary electronegativity of fluorine and the high free energy of fluoride formation, which enables the fluorinated components with cost effectiveness, nonflammability, and intrinsic stability. In particular, fluorinated materials and electrode|electrolyte interphases have been demonstrated to significantly affect reaction reversibility/kinetics, safety, and temperature tolerance of rechargeable batteries. However, the underlining principles governing material design and the mechanistic insights of interphases at the atomic level have been largely overlooked. This review covers a wide range of topics from the exploration of fluorinecontaining electrodes, fluorinated electrolyte constituents, and other fluorinated battery components for metal-ion shuttle batteries to constructing fluoride-ion batteries, dual-ion batteries, and other new chemistries. In doing so, this review aims to provide a comprehensive understanding of the structure− property interactions, the features of fluorinated interphases, and cutting-edge techniques for elucidating the role of fluorine chemistry in rechargeable batteries. Further, we present current challenges and promising strategies for employing fluorine chemistry, aiming to advance the electrochemical performance, wide temperature operation, and safety attributes of rechargeable batteries.

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Section: Understanding Fluorinated Interphases In Li-based Batteriesmentioning

confidence: 99%

Fluorine Chemistry in Rechargeable Batteries: Challenges, Progress, and Perspectives

Wang,

Yang,

Meng

et al. 2024

Chem. Rev.

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“…[1][2][3][4][5] One of the approaches is the employment of electrolyte engineering based on solvation chemistry to customize the component and structure of SEI that can be adaptive to reactive and fluctuated Li metal surface. [6][7][8][9][10] It is widely accepted that fluorinated SEI (f-SEI) containing lithium fluoride (LiF) domains performs well because of its high Li + transport (low Li + diffusion barrier of 0.19 eV), [11,12] extraordinary electronic insulation (high bandgap of 14.6 eV), and favorable mechanical property (large shear modulus of 48.6 GPa), which have been proved to inhibit the Li dendrite growth and facilitate Li migration. [13][14][15][16] The routine introduction of fluorine to SEI is achieved by electrochemical decomposition of fluorinated Li salts and solvents on the electrode surface.…”

Section: Doi: 101002/aenm202303336mentioning

confidence: 99%

Directing Fluorinated Solid Electrolyte Interphase by Solubilizing Crystal Lithium Fluoride in Aprotic Electrolyte for Lithium Metal Batteries

Fan,

Zhang,

Yao

et al. 2024

Advanced Energy Materials

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Lithium fluoride (LiF) facilitates robust and fast‐ion‐transport solid electrolyte interphase (SEI) in lithium metal batteries. Fluorinated solvents/salts are ubiquitously employed to introduce LiF into SEI through electrochemical decomposition, but this approach is usually at the expense of their continuous consumption. A direct approach to fluorinate SEI that employs crystal LiF is limited by its poor solubility in the current battery electrolyte formulation. Dissolving crystal LiF in high‐dielectric‐constant solvents, like ethylene carbonate (EC) is nearly neglected. Herein, the feasibility of directly fluorinating SEI by the addition of crystal LiF in aprotic electrolyte with the assistance of EC is verified, and its mechanisms in fluorination of SEI and anti‐acidification of electrolyte are explored. The dissolved LiF is encapsulated by solvent‐/salt‐derived organic skins to promote the fluorinated SEI. Meanwhile, the presence of LiF in electrolyte alters hazardous thermodynamic equilibrium, suppressing the production of acid species to mitigate electrolyte acidification and SEI degradation. Such collective benefits yield a capacity retention ratio of ≈88% after 150 cycles at a high areal capacity (4.5 mAh cm−2) in Li||NCM622 cells. This facile and effective fluorination of SEI contributes to an in‐depth understanding of SEI formation and rational design of well‐performing lithium metal batteries.

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Dual-additives enable stable electrode-electrolyte interfaces for long life Li-SPAN batteries

Cited by 2 publications

References 34 publications

Fluorine Chemistry in Rechargeable Batteries: Challenges, Progress, and Perspectives

Fluorine Chemistry in Rechargeable Batteries: Challenges, Progress, and Perspectives

Directing Fluorinated Solid Electrolyte Interphase by Solubilizing Crystal Lithium Fluoride in Aprotic Electrolyte for Lithium Metal Batteries

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