High-Li+-fraction ether-side-chain pyrrolidinium–asymmetric imide ionic liquid electrolyte for high-energy-density Si//Ni-rich layered oxide Li-ion batteries

Umesh, B.; Rath, Purna Chandra; Patra, Jagabandhu; Hernandha, Rahmandhika Firdauzha Hary; Majumder, S. B.; Gao, Xinpei; Bresser, Dominic; Passerini, Stefano; Lai, Hong Zheng; Chang, Tseng Lung; Chang, Jeng Kuei

doi:10.1016/j.cej.2021.132693

Cited by 18 publications

(11 citation statements)

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“…Such moieties are less protective and resistant to Li + transport . The Li@SNI sample has higher Li 2 CO 3 and CF x content, which can better stabilize the Li surface . As shown in Figure e, the F 1s spectrum of Li@EBI consists of a signal at ∼685.1 eV related to LiF and a signal at ∼687.0 eV associated with P–F bonding, which results from the decomposition of LiPF 6 salt …”

Section: Resultsmentioning

confidence: 98%

“…The deconvoluted peaks at ∼685.1 and ∼689.1 eV are attributed to LiF and CF x species, respectively. 67 The decomposition of LiTFSI and FEC in SNI promotes the formation of the F-rich SEI, which is electrochemically stable and believed to be a good electronic insulator that can protect the Li surface and prevent excessive electrolyte consumption. 66,68 Further, this layer is responsible for the greatly reduced dehydrofluorination reactions of PVDF-HFP.…”

Section: Resultsmentioning

confidence: 99%

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Suppression of Dehydrofluorination Reactions of a Li_0.33La_0.557TiO₃-Nanofiber-Dispersed Poly(vinylidene fluoride-co-hexafluoropropylene) Electrolyte for Quasi-Solid-State Lithium-Metal Batteries by a Fluorine-Rich Succinonitrile Interlayer

Rath

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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Solid-state lithium-metal batteries have great potential to simultaneously achieve high safety and high energy density for energy storage. However, the low ionic conductivity of the solid electrolyte and large electrode/electrolyte interfacial impedance are bottlenecks. A composite solid electrolyte (CSE) that integrates electrospun Li 0.33 La 0.557 TiO 3 (LLTO) nanofibers, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is fabricated in this work. The effects of the LLTO filler fraction and morphology (spherical vs fibrous) on CSE conductivity are examined. Additionally, a fluorine-rich interlayer based on succinonitrile, fluoroethylene carbonate, and LiTFSI, denoted as succinonitrile interlayer (SNI), is developed to reduce the large interfacial impedance. The use of SNI rather than a conventional ester-based interlayer (EBI) effectively decreases the Li//CSE interfacial resistance and suppresses unfavorable interfacial side reactions. The LiF-and CF x -rich solid electrolyte interphase (SEI), derived from SNI, on the Li metal electrode, mitigates the accumulation of dead Li and excessive SEI. Importantly, dehydrofluorination reactions of PVDF-HFP are significantly reduced by the introduction of SNI. A symmetric Li//CSE//Li cell with SNI exhibits a much longer cycle life than that of an EBI counterpart. A Li//CSE@SNI//LiFePO 4 cell shows specific capacities of 150 and 112 mAh g −1 at 0.1 and 2 C (based on LiFePO 4 ), respectively. After 100 charge−discharge cycles, 98% of the initial capacity is retained.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Suppression of Dehydrofluorination Reactions of a Li_0.33La_0.557TiO₃-Nanofiber-Dispersed Poly(vinylidene fluoride-co-hexafluoropropylene) Electrolyte for Quasi-Solid-State Lithium-Metal Batteries by a Fluorine-Rich Succinonitrile Interlayer

Rath

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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“…Aer that, research on various types of batteries, mainly for such structures, is emerging. [95][96][97][98][99] Lin et al 97 developed a low-cost polyacrylonitrile (PAN) gel electrolyte membrane for selective transport of Zn 2+ ions and a dualfunction oxygen catalyst for excellent performance in acidic media. Yang et al 100 has designed a two-in-one set of solid electrolytes by in situ polymerization.…”

Section: Asymmetric Electrolytesmentioning

confidence: 99%

Challenges for large scale applications of rechargeable Zn–air batteries

et al. 2022

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“…Many approaches have been proposed for improving LIB performance. [ 1 , 2 , 3 , 4 ] Increases in the specific capacity and rate capability of anode materials are particularly desirable for next‐generation LIBs because the conventional graphite electrode has a limited capacity and unsatisfactory high‐rate performance. [ 5 ] Lithium (Li) metal is an appealing candidate anode material due to its low potential and extremely high capacity (theoretically 3860 mAh g −1 ).…”

Section: Introductionmentioning

confidence: 99%

Charge–Discharge Mechanism of High‐Entropy Co‐Free Spinel Oxide Toward Li⁺ Storage Examined Using Operando Quick‐Scanning X‐Ray Absorption Spectroscopy

et al. 2022

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Transition metal high-entropy oxides (HEOs) are an attractive class of anode materials for high-performance lithium-ion batteries (LIBs). However, owing to the multiple electroactive centers of HEOs, the Li + storage mechanism is complex and debated in the literature. In this work, operando quick-scanning X-ray absorption spectroscopy (XAS) is used to study the lithiation/delithiation mechanism of the Cobalt-free spinel (CrMnFeNiCu) 3 O 4 HEO. A monochromator oscillation frequency of 2 Hz is used and 240 spectra are integrated to achieve a 2 min time resolution. High-photon-flux synchrotron radiation is employed to increase the XAS sensitivity. The results indicate that the Cu 2+ and Ni 2+ cations are reduced to their metallic states during lithiation but their oxidation reactions are less favorable compared to the other elements upon delithiation. The Mn 2+/3+ and Fe 2+/3+ cations undergo two-step conversion reactions to form metallic phases, with MnO and FeO as the intermediate species, respectively. During delithiation, the oxidation of Mn occurs prior to that of Fe. The Cr 3+ cations are reduced to CrO and then Cr 0 during lithiation. A relatively large overpotential is required to activate the Cr reoxidation reaction. The Cr 3+ cations are found after delithiation. These results can guide the material design of HEOs for improving LIB performance.

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High-Li+-fraction ether-side-chain pyrrolidinium–asymmetric imide ionic liquid electrolyte for high-energy-density Si//Ni-rich layered oxide Li-ion batteries

Cited by 18 publications

References 63 publications

Suppression of Dehydrofluorination Reactions of a Li_0.33La_0.557TiO₃-Nanofiber-Dispersed Poly(vinylidene fluoride-co-hexafluoropropylene) Electrolyte for Quasi-Solid-State Lithium-Metal Batteries by a Fluorine-Rich Succinonitrile Interlayer

Suppression of Dehydrofluorination Reactions of a Li_0.33La_0.557TiO₃-Nanofiber-Dispersed Poly(vinylidene fluoride-co-hexafluoropropylene) Electrolyte for Quasi-Solid-State Lithium-Metal Batteries by a Fluorine-Rich Succinonitrile Interlayer

Challenges for large scale applications of rechargeable Zn–air batteries

Charge–Discharge Mechanism of High‐Entropy Co‐Free Spinel Oxide Toward Li⁺ Storage Examined Using Operando Quick‐Scanning X‐Ray Absorption Spectroscopy

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High-Li+-fraction ether-side-chain pyrrolidinium–asymmetric imide ionic liquid electrolyte for high-energy-density Si//Ni-rich layered oxide Li-ion batteries

Cited by 18 publications

References 63 publications

Suppression of Dehydrofluorination Reactions of a Li0.33La0.557TiO3-Nanofiber-Dispersed Poly(vinylidene fluoride-co-hexafluoropropylene) Electrolyte for Quasi-Solid-State Lithium-Metal Batteries by a Fluorine-Rich Succinonitrile Interlayer

Suppression of Dehydrofluorination Reactions of a Li0.33La0.557TiO3-Nanofiber-Dispersed Poly(vinylidene fluoride-co-hexafluoropropylene) Electrolyte for Quasi-Solid-State Lithium-Metal Batteries by a Fluorine-Rich Succinonitrile Interlayer

Challenges for large scale applications of rechargeable Zn–air batteries

Charge–Discharge Mechanism of High‐Entropy Co‐Free Spinel Oxide Toward Li+ Storage Examined Using Operando Quick‐Scanning X‐Ray Absorption Spectroscopy

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Product

Resources

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Suppression of Dehydrofluorination Reactions of a Li_0.33La_0.557TiO₃-Nanofiber-Dispersed Poly(vinylidene fluoride-co-hexafluoropropylene) Electrolyte for Quasi-Solid-State Lithium-Metal Batteries by a Fluorine-Rich Succinonitrile Interlayer

Suppression of Dehydrofluorination Reactions of a Li_0.33La_0.557TiO₃-Nanofiber-Dispersed Poly(vinylidene fluoride-co-hexafluoropropylene) Electrolyte for Quasi-Solid-State Lithium-Metal Batteries by a Fluorine-Rich Succinonitrile Interlayer

Charge–Discharge Mechanism of High‐Entropy Co‐Free Spinel Oxide Toward Li⁺ Storage Examined Using Operando Quick‐Scanning X‐Ray Absorption Spectroscopy