Multifunctional V3S4-nanowire/graphene composites for high performance Li-S batteries

Tang, Tianyu; Zhang, Teng; Zhao, Lina; Zhang, Biao; Li, Wei; Xu, Junjie; Li, Tao; Zhang, Long; Qiu, Hailong; Hou, Yanglong

doi:10.1007/s40843-020-1313-6

Cited by 34 publications

(20 citation statements)

References 56 publications

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“…And a further reduced N 2 adsorption observed in S@EB‐COF‐PS demonstrate that most of the remaining pores in EB‐COF‐PS are occupied by elemental sulfur, while the pore at 1.3 nm in EB‐COF‐PS disappeared after the sulfur loading. As shown in Figure 1c, after immersing EB‐COF‐Br into the Li 2 S 8 solution, a colorless supernatant could be obtained and the typical absorption peaks of Li 2 S 8 almost disappear completely (Figure S3, Supporting Information), implying that EB‐COF‐Br can absolutely adsorb Li 2 S 8 molecule [ 68 ] while verifying the feasibility of the anion exchange process. In addition, XPS analysis of EB‐COF‐PS reveals the presence of only sulfur, carbon, oxygen, and nitrogen elements (Figure 1d), but no bromine existing compared with EB‐COF‐Br, which is further verified by the elemental analysis, indicating that the bromide within EB‐COF‐Br has been completely interchanged.…”

Section: Methodsmentioning

confidence: 94%

Cationic Covalent‐Organic Framework as Efficient Redox Motor for High‐Performance Lithium–Sulfur Batteries

Liu

Chen

Wang

et al. 2020

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The shuttle effect of soluble lithium polysulfides (LiPSs) leads to the rapid decay of sulfur cathode, severely hindering the practical applications of lithium‐sulfur (Li‐S) batteries. To this point, a covalent‐organic framework (COF) with proper cationic sites, which can be utilized as the cathode host of high‐performance Li–S batteries, is reported. The chemical sulfur anchoring within micropores effectively suppresses the dissolution of LiPSs into the electrolyte. During the discharge step, the cationic sites can accept electrons from anode and deliver them to polysulfides to facilitate the polysulfides' disintegration. Meanwhile, the cationic sites can receive electrons from polysulfides and then send them to the anode during the charge process, which promotes the polysulfides oxidation. Thus, both experiments and computational modeling show that the cationic COF can effectively inhibit the shuttle effect of LiPSs and improve the batteries' performances. Compared with electrically neutral COFs, the cationic COF‐based batteries show much better cycling stability even at high current density, for instance, a high specific capacity of 468 mA h g−1 is retained after 300 cycles at a current density of 4.0 C.

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Section: Methodsmentioning

confidence: 94%

Cationic Covalent‐Organic Framework as Efficient Redox Motor for High‐Performance Lithium–Sulfur Batteries

Liu

Chen

Wang

et al. 2020

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“…[ 118 ] Similar to polysulfides in Li‐S batteries, polyiodides in aqueous Zn‐I 2 batteries also face a serious shuttle effect, resulting in the degradation of electrochemical performance. [ 119–123 ] First, they designed a three‐electrode cell to monitor the I 3 − shuttle with the assistance of in situ Raman spectroscopy. As shown in Figure 9b, the I 3 − signal centered at 122 cm −1 was strong and did not change with detection depth.…”

Section: In Situ Characterization Techniques and Xas Analyses In Azmbsmentioning

confidence: 99%

Comprehensive Analyses of Aqueous Zn Metal Batteries: Characterization Methods, Simulations, and Theoretical Calculations

Zhang

Hou

2021

Advanced Energy Materials

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Aqueous zinc metal batteries (AZMBs) are regarded as competitive candidates for next‐generation energy storage owing to their low cost, high performance, high safety, and high environmental friendliness. However, serious issues, including Zn dendrites, chemical corrosion, H2 evolution, and sluggish Zn2+ diffusion kinetics, have largely impeded the commercial application of AZMBs. To understand these issues in depth and identify countermeasures, comprehensive analyses of AZMBs have continuously been developed. In this review, a detailed overview of the analytical techniques used to study AZMBs, including characterization methods, simulations, and theoretical calculations is presented, which provides a comprehensive toolbox for further research. Conventional characterization methods that provide preliminary information are first summarized. Various in situ techniques, including visualization and spectral characterization, are then discussed. These advanced real‐time monitoring techniques contribute to a deeper understanding of the battery failure mechanism. Simulations and theoretical calculations are then presented in detail, enabling an in‐depth investigation of the mechanism at the atomic level. Theoretical analyses can not only explore the mechanism in more detail, but also play a key role in guiding research and predicting future directions. Finally, the challenges and perspective of comprehensive analyses of AZMBs are discussed.

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“…With the overall reaction of 2Li + S = Li 2 S, some fundamental issues exist in Li-S chemistry, including the insulation of sulfur/Li 2 S, the volume variation of the cathode during cycling, the shuttle of soluble intermediate lithium polysulfides (LiPS) in ether-based electrolyte, and dendrites/cracks on lithium anode [4][5]. In the past decade, great efforts have been made to tackle these issues, such as employing sophisticated cathode structure [6][7][8], heteratom-doped carbon [9][10][11], polar compounds [12][13][14][15][16], interlayers [17][18], functional separators [19][20], novel binders [21][22], and stabilized anode [23][24][25][26]. As a result, the battery performance has improved to a large extent.…”

Section: Introductionmentioning

confidence: 99%

Constructing high gravimetric and volumetric capacity sulfur cathode with LiCoO2 nanofibers as carbon-free sulfur host for lithium-sulfur battery

et al. 2021

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Although the gravimetric energy density of lithium-sulfur battery is very encouraging, the volumetric energy density still remains a challenge for the practical application. To achieve the high volumetric energy density of battery, much attention should be paid to the sulfur cathode. Herein, we introduce heavy lithium cobalt oxide (LiCoO 2 ) nanofibers as sulfur host to enhance the volumetric capacity of cathode, maintaining the high gravimetric capacity simutaneously. With the high tap density of 2.26 g cm −3 , LiCoO 2 nanofibers can be used to fabricate a really compact sulfur cathode, with a density and porosity of 0.85 g cm −3 and 61.2%, respectively. More importantly, LiCoO 2 nanofibers could act as an efficient electrocatalyst for enhancing the redox kinetics of sulfur species, ensuring the cathode electroactivity and alleviating the shuttle effect of polysulfides. Therefore, a balance between compact structure and high electrochemical activity is obtained for the sulfur cathode. At the sulfur loading of 5.1 mg cm −2 , high volumetric and gravimetric capacities of 724 mA h cm −3 cathode and 848 mA h g −1 cathode could be achieved based on the cathode volume and weight, respectively. Moreover, with this efficient S/LiCoO 2 cathode, the lithium corrosion by polysulfides is supressed, leading to a more stable lithium anode.

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Multifunctional V3S4-nanowire/graphene composites for high performance Li-S batteries

Cited by 34 publications

References 56 publications

Cationic Covalent‐Organic Framework as Efficient Redox Motor for High‐Performance Lithium–Sulfur Batteries

Cationic Covalent‐Organic Framework as Efficient Redox Motor for High‐Performance Lithium–Sulfur Batteries

Comprehensive Analyses of Aqueous Zn Metal Batteries: Characterization Methods, Simulations, and Theoretical Calculations

Constructing high gravimetric and volumetric capacity sulfur cathode with LiCoO2 nanofibers as carbon-free sulfur host for lithium-sulfur battery

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