A Fairy on a Blooming Flower—Cuo-Zno Heterojunction Doped 2d Ultrathin Carbon Nanosheet Catalyzes Rapid Charge-Transfer Kinetics of Lithium-Sulfur Batteries

Yang, Hang; Li, Libo; Shan, Yuhang; Zhao, Yangmingyue; Fan, Shubo

doi:10.2139/ssrn.4249715

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“…C−F compounds are detected in the C 1s spectra with peaks at 293.13 eV (−CF 3 ), 290.21 eV (−CF 2 ), and 289.10 eV (C−F) and F 1s spectra with peaks at 689.5 eV (−CF 3 ), 688.6 eV (−CF 2 ), and 687.7 eV (C−F), respectively. In comparison of the XPS spectrum of the pristine UPH-SPE membrane, the F 1s XPS spectrum of cycled UPH-SPE (the side that contacts Li metal) recovered from the Li|UPH-SPE|LFP full cell exhibits an obviously prominent peak at 684.7 eV, 55,56 indicating that the UPH-SPE surface after cycling contains a higher concentration of LiF. Moreover, the Li 1s XPS spectrum of cycled UPH-SPE further confirms the existence of LiF with a primary peak at 55.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Poly(vinylidene fluoride-co-hexafluoropropylene)-Based Solid Polymer Electrolyte Incorporated with UiO-66 for Lithium Metal Batteries

Liu,

Xu,

Liu

et al. 2023

Energy Fuels

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All-solid-state lithium metal batteries (ASSLMBs) have garnered significant interest as a result of their enhanced safety features and higher energy density compared to traditional lithium-ion batteries with liquid electrolytes. Nonetheless, a substantial challenge within ASSLMBs lies in the constrained lithium-ion flux encountered in solid-state polymer electrolytes, resulting in subpar performance during high-current charging and discharging scenarios. This limitation detrimentally affects the electrochemical performance of ASSLMBs. In this present work, we introduce a novel composite solid polymer electrolyte (CSPE) comprising metal–organic frameworks, namely, UiO-66, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and lithium bis(trifluoromethane)-sulfonimide (LiTFSI) (referred to as UPH-SPE). UPH-SPE containing 5 wt % UiO-66 demonstrates exceptional characteristics, including a high ionic conductivity of 4.7 × 10–4 S cm–1, an electrochemical stability window of 4.9 V, and a remarkable lithium-ion transference number of 0.58 at 25 °C. Full cell tests unequivocally showcase that these newly developed composite electrolytes exhibit significantly improved performance in terms of the rate capability and cycling stability at room temperature. Specifically, the discharge capacity of ASSLMBs with UPH-SPE remains at 140 mAh g–1 when operated at a current density of 0.5 C over 100 cycles. Even after 200 cycles, the capacity is sustained at 94 mAh g–1. This study underscores the potential of our CSPE film to advance the practical application of ASSLMBs, offering promising prospects for future developments in this field.

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Section: ■ Results and Discussionmentioning

confidence: 99%