Confining sulfur in sandwich structure of bamboo charcoal and aluminum fluoride (BC@S@AlF ) as a long cycle performance cathode for Li-S batteries

Luo, Zhenya; Wang, Xiao; Lei, Weixin; Xia, Pengtao; Pan, Yong

doi:10.1016/j.jmst.2019.08.023

Cited by 17 publications

(5 citation statements)

References 18 publications

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“…Raw material GNSs showed type-III adsorption/desorption isotherms, while FG, DFG-x, and DFG-N obtained after fluorination exhibited type-IV adsorption/desorption isotherms with characteristic hysteresis loops representing mesopores. [37] This result means that the gas corrosion during fluorination makes the FG contain many mesopores, while the pore structure of DFG-x and DFG-N after defluorination and doping treatment does not change. The specific surface areas for the GNSs, FG, DFG-1, DFG-2, DFG-3, and DFG-N were measured to be 18.…”

Section: Resultsmentioning

confidence: 92%

Surface Engineering of Fluorinated Graphene Nanosheets Enables Ultrafast Lithium/Sodium/Potassium Primary Batteries

Luo

Wang

et al. 2023

Advanced Materials

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Fluorinated carbon (CFx) is considered as a promising cathode material for lithium/sodium/potassium primary batteries with superior theoretical energy density. However, achieving high energy and power densities simultaneously remains a considerable challenge due to the strong covalency of the C‐F bond in the highly fluorinated CFx. Herein, an efficient surface engineering strategy combining surface defluorination and nitrogen doping enables fluorinated graphene nanosheets (DFG‐N) to possess controllable conductive nanolayers and reasonably regulated C‐F bonds. The DFG‐N delivers an unprecedented dual performance for lithium primary batteries with a power density of 77456 W kg−1 and an energy density of 1067 Wh kg−1 at an ultrafast rate of 50 C, which is the highest level reported to date. The DFG‐N also achieved a record power density of 15256 and 17881 W kg−1 at 10 C for sodium and potassium primary batteries, respectively. The characterization results and density functional theory calculations demonstrate that the excellent performance of DFG‐N is attributed to surface engineering strategies that remarkably improve electronic and ionic conductivity without sacrificing the high fluorine content. This work provides a compelling strategy for developing advanced ultrafast primary batteries that combine ultrahigh energy density and power density.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 92%

Surface Engineering of Fluorinated Graphene Nanosheets Enables Ultrafast Lithium/Sodium/Potassium Primary Batteries

Luo

Wang

et al. 2023

Advanced Materials

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“…As shown in Figure 2e, the N 2 adsorption/desorption isotherms of all materials showed type-IV isotherms with hysteresis loops, indicating microporous and mesoporous structures. [37] The BET specific surface areas of CNTs, FCNTs, FCNTs@Ag-100, FCNTs@Ag-200, and FCNTs@Ag-300 were 220, 223, 218, 181, and 168 m 2 g -1 , respectively, corresponding to the pore volumes of 1.23, 0.79, 0.52, 0.42, and 0.39 cm 3 g -1 . The excellent porosity of FCNTs can provide abundant ion diffusion paths and reserve more space for LiF deposition during the discharge process, which is conducive to enhancing the reaction kinetics.…”

Section: Resultsmentioning

confidence: 95%

Ultrafast Nano-Silver Modified Fluorinated Carbon Nanotubes Cathode Enables Advanced Lithium/Sodium/Potassium Primary Batteries

Luo

Chen

Chang

et al. 2023

Preprint

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The application of fluorinated carbon (CFx)-based lithium/sodium/potassium primary batteries (LPBs/SPBs/PPBs) with superior theoretical energy density in high-power devices remains limited due to the poor rate performance resulting from the low intrinsic conductivity of highly fluorinated CFx materials. Herein, novel nano-silver modified fluorinated carbon nanotubes (FCNTs@Ag-x) composites with high electrical conductivity were prepared without sacrificing the high fluorine content. The dual excellent performance achieved by the FCNTs@Ag-200 cathode is attributed to the three-dimensional conductive network synergistically constructed by the interlaced FCNTs and coated nano-Ag, together with electrochemically active C-F bonds co-regulated by Ag atoms and curvature, as well as abundant conductive semi-ionic C-F bonds and graphite-like sp2 C=C bonds, and few inactive C-F2 bonds. The FCNTs@Ag-200 cathode delivers very high energy densities of 2167, 1930, and 2150 Wh kg-1 for LPBs, SPBs, and PPBs, respectively, close to the theoretical energy density. The Li/FCNTs@Ag-200 battery exhibits an ultimate power density of up to 80501 W kg-1 at an ultrafast rate of 50 C and can withstand a pulse discharge of 150 C (~129.75 A g-1). Remarkably, unprecedented power densities of 36650 and 40672 W kg-1 are achieved at a record rate of 25 C using FCNTs@Ag-200 as the cathode for Na/CFx and K/CFx batteries, respectively, which is a significant improvement over the state-of-the-art. Therefore, the advanced CFx-based primary batteries developed here are promising in applications that simultaneously require fast discharge, high energy density, high power density, and long-term storage.

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“…Compared with the cathode before cycling (Figure S11a, Supporting Information), it can be seen that dense layers have been formed on the surface of the cathode after 100 cycles at 1 C for the cell with the base separator (DKJ-14, Figure S11b, Supporting Information). This may be due to the deposition of insulating sulfur species on the cathode surface, [37,49] which reduces the utilization rate of active substances. On the contrary, the cathode surface of the cell with the SPLTOPD has a porous structure and no dense layer after 100 cycles at 1C (Figure S11c, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

A Separator with Double Coatings of Li₄Ti₅O₁₂and Conductive Carbon for Li‐S Battery of Good Electrochemical Performance

et al. 2023

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The market demand for energy pushes researchers to pay a lot of attention to Li-S batteries. However, the 'shuttle effect', the corrosion of lithium anodes, and the formation of lithium dendrites make the poor cycling performances (especially under high current densities and high sulfur loading) of Li-S batteries, which limit their commercial applications. Here, a separator is prepared and modified with Super P and LTO (abbreviation SPLTOPD) through a simple coating method. The LTO can improve the transport ability of Li + cations, and the Super P can reduce the charge transfer resistance. The prepared SPLTOPD can effectively barrier the pass-through of polysulfides, catalyze the reactions of polysulfides into S 2− , and increase the ionic conductivity of the Li-S batteries. The SPLTOPD can also prevent the aggregation of insulating sulfur species on the surface of the cathode. The assembled Li-S batteries with the SPLTOPD can cycle 870 cycles at 5 C with the capacity attenuation of 0.066% per cycle. When the sulfur loading is up to 7.6 mg cm −2 , the specific discharge capacity at 0.2 C can reach 839 mAh g −1 , and the surface of lithium anode after 100 cycles does not show the existence lithium dendrites or a corrosion layer. This work provides an effective way for the preparation of commercial separators for Li-S batteries.

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Confining sulfur in sandwich structure of bamboo charcoal and aluminum fluoride (BC@S@AlF ) as a long cycle performance cathode for Li-S batteries

Cited by 17 publications

References 18 publications

Surface Engineering of Fluorinated Graphene Nanosheets Enables Ultrafast Lithium/Sodium/Potassium Primary Batteries

Surface Engineering of Fluorinated Graphene Nanosheets Enables Ultrafast Lithium/Sodium/Potassium Primary Batteries

Ultrafast Nano-Silver Modified Fluorinated Carbon Nanotubes Cathode Enables Advanced Lithium/Sodium/Potassium Primary Batteries

A Separator with Double Coatings of Li₄Ti₅O₁₂and Conductive Carbon for Li‐S Battery of Good Electrochemical Performance

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Confining sulfur in sandwich structure of bamboo charcoal and aluminum fluoride (BC@S@AlF ) as a long cycle performance cathode for Li-S batteries

Cited by 17 publications

References 18 publications

Surface Engineering of Fluorinated Graphene Nanosheets Enables Ultrafast Lithium/Sodium/Potassium Primary Batteries

Surface Engineering of Fluorinated Graphene Nanosheets Enables Ultrafast Lithium/Sodium/Potassium Primary Batteries

Ultrafast Nano-Silver Modified Fluorinated Carbon Nanotubes Cathode Enables Advanced Lithium/Sodium/Potassium Primary Batteries

A Separator with Double Coatings of Li4Ti5O12and Conductive Carbon for Li‐S Battery of Good Electrochemical Performance

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A Separator with Double Coatings of Li₄Ti₅O₁₂and Conductive Carbon for Li‐S Battery of Good Electrochemical Performance