In Situ Electrochemical Intercalation‐Induced Phase Transition to Enhance Catalytic Performance for Lithium–Sulfur Battery

Liu, Kangli; Zhang, Xiangdan; Miao, Fujun; Wang, Zhuo; Zhang, Shijie; Zhang, Yongshang; Zhang, Peng; Shao, Guosheng

doi:10.1002/smll.202100065

Cited by 36 publications

(32 citation statements)

References 58 publications

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“…Specifically, CV curves of the cell with RPM/PP separator possess a much smaller potential gap and larger current density in the redox peaks, indicating accelerated redox kinetics of sulfur species (Figure S5, Supporting Information). [ 8 ] The peak positions and current intensities show no obvious changes after successive five cycles, verifying that the cell with RPM/PP separator exhibits high reaction reversibility and electrochemical stability (Figure S6, Supporting Information). As shown in the rate performance results, the cell with RPM/PP delivers highly reversible specific capacities of 1364, 1323, 1228, 1131, 1001, and 777 mAh g −1 at the rates of 0.1, 0.2, 0.5, 1, 2, and 5 C (1 C = 1675 mA g −1 ), respectively (the capacities are selected as the third cycle of each rate), which are superior to PP, MoS 2 /PP, RGO‐PANI/PP, and most of the other reported interlayer materials (Figure 2b,c and Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 76%

“…Lithium-ion batteries (LIBs) based on intercalation chemistry have been widely used in the past few decades, especially accompanying the leap development of power batteries for 2103657 (2 of 12) efforts have been made to mitigate the above issues through a combination of sulfur and various conductive hosts by chemical and/or physical interaction. [6][7][8][9][10] Although the cycle stability and rate ability of those sulfur cathodes are obviously improved, the inactive hosts contribute to the dead weight, which leads to low sulfur content in the entire electrodes, inhibiting the practical application of LSBs. Modification of separators (including interlayers) in LSBs has been verified to be a simple and effective strategy to suppress the polysulfides' shuttle effect.…”

Section: Introductionmentioning

confidence: 99%

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A Mott–Schottky Heterogeneous Layer for Li–S Batteries: Enabling Both High Stability and Commercial‐Sulfur Utilization

Shi

Zheng

Zhang

et al. 2022

Advanced Energy Materials

108

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electric vehicles. [1,2] However, the further scaled application of commercial LIBs encounters a "bottleneck": the overall energy density is approaching the ceiling due to the restriction of theoretical specific capacity of insertion-type oxide cathodes (≈250 mAh g −1 ) and graphite anodes (372 mAh −1 ). In order to satisfy the increasing demand for higher energy densities particularly under the extended application such as unmanned aerial vehicles, cargo aircraft, electric vehicles, and the exploration of novel storage system is of great significance. [3] Sulfur is earthabundant, low-cost, and environment friendly. More inspiring, lithium-sulfur batteries (LSBs) based on sulfur cathodes exhibit much higher theoretical specific capacity (1675 mAh g −1 ) through the multielectron redox reaction process, showing great potential for high-performance energy storage devices. [4] Despite the promising prospects, the practical application of LSBs is still impeded by several challenges, such as electrical insulation of sulfur and discharge products (Li 2 S/Li 2 S 2 ), severe shuttle effect of long-chain polysulfides (LiPSs, Li 2 S n , 4 ≤ n ≤ 8), low sulfur utilization, and large volume expansion (≈80%), which are critically fatal for the cycle stability and power density. [5] In the last decades, tremendous Lithium-sulfur batteries (LSBs) are severely impeded by their poor cycling stability and low sulfur utilization due to the inevitable polysulfide shuttle effect and sluggish reaction kinetics. This work reports a Mott-Schottky RGO-PANI/MoS 2 (RPM) heterogeneous layer modified separator for commercialsulfur-based LSBs through the vertical growth of molybdenum sulfide (MoS 2 ) arrays on the polyaniline (PANI) in situ reduced graphene oxide (RGO). Due to the synergistic effects of the "reservoir" constructed by MoS 2 and RGO-PANI, strong absorbability, high conductivity, and electrocatalytic activity, RPM exhibits a successive "trapping-interception-conversion" behavior toward lithium polysulfides. As a result, the LSBs assembled using a commercialsulfur as the cathode and RPM as modified layer exhibit high sulfur utilization (3.8 times higher than that of the unmodified separator at 5 C), excellent rate performance (553 mAh g −1 at 10 C), and outstanding high-rate cycle stability (524 mAh g −1 after 700 cycles at 5 C). Moreover, even at a high sulfur loading of 5.4 mg cm −2 , a favorable areal capacity of 3.8 mAh cm −2 is still maintained after 80 cycles. Theoretical calculations elucidate that such a systematic strategy can effectively suppress the shuttling effect and boost the catalytic conversion of intercepted polysulfides. This work may provide a feasible strategy to promote the practical application of commercial-sulfur-based LSBs.

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Section: Resultsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

A Mott–Schottky Heterogeneous Layer for Li–S Batteries: Enabling Both High Stability and Commercial‐Sulfur Utilization

Shi

Zheng

Zhang

et al. 2022

Advanced Energy Materials

108

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“…Numerous materials have been explored to serve as sulfur hosts or additives to tackle the aforementioned issues, including nonpolar conductive carbon‐based materials 4,17–19 and polar compounds (oxides, nitrides, and carbides) 12,18,20–25 . Previous reports proved that nonpolar carbon materials are only able to offer limited affinity with LiPS, due to the rather weak van der Waals force in‐between 26–28 .…”

Section: Introductionmentioning

confidence: 99%

A flexible metallic TiC nanofiber/vertical graphene 1D/2D heterostructured as active electrocatalyst for advanced Li–S batteries

Zhang

et al. 2021

InfoMat

Self Cite

171

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The realistic application of lithium–sulfur (Li–S) batteries has been severely hindered by the sluggish conversion kinetics of polysulfides (LiPS) and inhomogeneous deposition of Li2S at high sulfur loading and low electrolyte/sulfur ratio (E/S). Herein, a flexible Li–S battery architecture based on electrocatalyzed cathodes made of interfacial engineered TiC nanofibers and in situ grown vertical graphene are developed. Integrated 1D/2D heterostructured electrocatalysts are realized to enable highly improved Li+ and electron transportation together with significantly enhanced affinity to LiPS, which effectively accelerate the conversion kinetics between sulfur species, and thus induce homogeneous deposition of Li2S in the catalyzed cathodes. Consequently, highly active electro‐electrocatalysts‐based cells exhibit remarkable rate capability at 2C with a high specific capacity of 971 mAh g−1. Even at ultra‐high sulfur loading and low E/S ratio, the battery still delivers a high areal capacity of 9.1 mAh cm−2, with a flexible pouch cell being demonstrated to power a LED array at different bending angles with a high capacity over 100 cycles. This work puts forward a novel pathway for the rational design of effective nanofiber electrocatalysts for cathodes of high‐performance Li–S batteries.

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“…[47,48] In the case of a conductor, the work function determines its electron capture ability. [49][50][51] The work function (Φ) values of TiO 2 and MoS 2 were calculated to be 4.3 and 5.68 eV, respectively (Figure 4A). The work function of TiN is generally considered to be 3.74 eV.…”

Section: Resultsmentioning

confidence: 99%

Dual‐Modified Hollow Spherical Shell MoS₂@TiO₂/TiN Composites for Photocatalytic Hydrogen Production

Liu

et al. 2021

Energy Tech

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Coupling suitable cocatalysts is an effective strategy to improve the performance of photocatalytic hydrogen production. Herein, we constructed a dual-cocatalystmodified TiO 2 -based photocatalyst with a hollow-spherical-shell structure. Both the MoS 2 nanosheets and the TiN particles are in intimate contact with the TiO 2 , resulting in multiple interfaces and junctions. According to experimental results and the band structure, the photogenerated electrons transfer from TiO 2 to MoS 2 or TiN through the multiple interfaces. The MoS 2 and TiN together enhance the photocatalytic performance of TiO 2 . The hydrogen evolution rate of MoS 2 @TiO 2 / TiN (MTT) reaches 128.77 μmol g À1 h À1 , which is 4.18 times higher than that of pristine TiO 2 (30.81 μmol g À1 h À1 ). The performance improvement of composites is attributed to more catalytically active sites, stronger light absorption, and better electron-hole separation effects. This work aims to provide a strategy for the rational design of catalysts for further development in both mechanism understanding and practical application.

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In Situ Electrochemical Intercalation‐Induced Phase Transition to Enhance Catalytic Performance for Lithium–Sulfur Battery

Cited by 36 publications

References 58 publications

A Mott–Schottky Heterogeneous Layer for Li–S Batteries: Enabling Both High Stability and Commercial‐Sulfur Utilization

A Mott–Schottky Heterogeneous Layer for Li–S Batteries: Enabling Both High Stability and Commercial‐Sulfur Utilization

A flexible metallic TiC nanofiber/vertical graphene 1D/2D heterostructured as active electrocatalyst for advanced Li–S batteries

Dual‐Modified Hollow Spherical Shell MoS₂@TiO₂/TiN Composites for Photocatalytic Hydrogen Production

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In Situ Electrochemical Intercalation‐Induced Phase Transition to Enhance Catalytic Performance for Lithium–Sulfur Battery

Cited by 36 publications

References 58 publications

A Mott–Schottky Heterogeneous Layer for Li–S Batteries: Enabling Both High Stability and Commercial‐Sulfur Utilization

A Mott–Schottky Heterogeneous Layer for Li–S Batteries: Enabling Both High Stability and Commercial‐Sulfur Utilization

A flexible metallic TiC nanofiber/vertical graphene 1D/2D heterostructured as active electrocatalyst for advanced Li–S batteries

Dual‐Modified Hollow Spherical Shell MoS2@TiO2/TiN Composites for Photocatalytic Hydrogen Production

Contact Info

Product

Resources

About

Dual‐Modified Hollow Spherical Shell MoS₂@TiO₂/TiN Composites for Photocatalytic Hydrogen Production