Ferroelectric‐Enhanced Polysulfide Trapping for Lithium–Sulfur Battery Improvement

Xie, Keyu; You, You; Yuan, Kai; Lü, Wei; Zhang, Kun; Xu, Fei; Ye, Mao; Ke, Shanming; Shen, Chao; Zeng, Xierong; Fan, Xiaoli; Wei, Bingqing

doi:10.1002/adma.201604724

Cited by 167 publications

(99 citation statements)

References 46 publications

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“…When cycled at 0.2 C, an initial capacity of 1015 mAh g −1 is attained for the 5.0 mg cm −2 electrode, corresponding to an areal capacity of 5.1 mAh cm −2 . The areal specific capacities under high sulfur loadings in this work are remarkable among the reported hybrid sulfur hosts (Figure 6d; Figure S17, Supporting Information), [17,20,25,[43][44][45][46][47] especially for the cycling at a high current density (1 C), where there has been a limited number of studies (Figure 6d). Further, the cycling stabilities of our hybrid electrodes could be well maintained even at high current densities.…”

Section: Doi: 101002/aenm201800201mentioning

confidence: 57%

In Situ Assembly of 2D Conductive Vanadium Disulfide with Graphene as a High‐Sulfur‐Loading Host for Lithium–Sulfur Batteries

Zhu

Zhao

Song

et al. 2018

Advanced Energy Materials

201

134

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The ever-growing demand for high-energy and long-life energy storage devices has spurred extensive research beyond conventional lithium-ion battery systems. Amongst these, rechargeable lithium-sulfur (Li-S) batteries, as a promising next-generation energy storage technology, have captured vast interest because of the high capacity (1672 mAh g −1 ), large abundance of sulfur, and environmental compatibility. [1][2][3][4] Although there has been significant advance by far in designing state-of-theart Li-S batteries, their practical utilization and large-scale commercialization are still impeded by a multitude of technological obstacles, namely, i) the insulating nature of S/Li 2 S that would jeopardize the overall conductivity of the electrode and hence affect the utilization of sulfur; ii) the shuttle effect induced by the dissolution and diffusion of lithium polysulfide that could lead to a rapid capacity fading; and iii) the considerable volume expansion of the sulfur cathode upon cycling. [5,6] To tackle these issues, great efforts have been devoted to developing appropriate host materials in combination with optimizing the cathode architectures toward advanced Li-S batteries. A ubiquitously employed strategy is to encapsulate sulfur and/or polysulfides with the aid of porous carbonaceous materials, such as carbon nanotubes, [1,[7][8][9][10] hollow carbon spheres, [11,12] and graphene, [13][14][15] aiming to attain enhanced electrode conductivity, improved sulfur utilization, and buffered volume change. However, this has been proved to be far from ideal, owing to weak van der Waals (vdW) interaction between nonpolar carbon and polar polysulfide species that only gives rise to a physical confinement, insufficient to alleviate the polysulfide shuttle over a long lifespan. In this regard, the introduction of polar nanomaterials (e.g., transition metal oxides, [16][17][18] sulfides, [19][20][21] and nitrides [22,23] ) within the sulfur host has witnessed an efficient suppression of shuttle effect, where polysulfides are chemically anchored onto these polar species. Nevertheless, the limited electrical conductivity of most metal oxides/sulfides would otherwise result in sluggish kinetics of polysulfide redox reactions, inevitably causing poor rate capability and fast capacity decay. Latest investigations have revealed that the integration of polar nanocrystals/nanosheets Lithium-sulfur (Li-S) batteries are deemed to be one of the most promising energy storage technologies because of their high energy density, low cost, and environmental benignancy. However, existing drawbacks including the shuttling of intermediate polysulfides, the insulating nature of sulfur, and the considerable volume change of sulfur cathode would otherwise result in the capacity fading and unstable cycling. To overcome these challenges, herein an in situ assembly route is presented to fabricate VS 2 /reduced graphene oxide nanosheets (G-VS 2 ) as a sulfur host. Benefiting from the 2D conductive and polar VS 2 interlayered within a graphene fra...

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Section: Doi: 101002/aenm201800201mentioning

confidence: 57%

In Situ Assembly of 2D Conductive Vanadium Disulfide with Graphene as a High‐Sulfur‐Loading Host for Lithium–Sulfur Batteries

Zhu

Zhao

Song

et al. 2018

Advanced Energy Materials

201

134

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“…Polyaniline‐ co ‐polypyrrole (PACP) copolymer is generally used as a precursor to prepare porous carbons for supercapacitors, and sulfur‐host in lithium–sulfur batteries . However, these applications do rely on the porous architecture of the resultant carbons from PACP.…”

Section: Resultsmentioning

confidence: 99%

A Site‐Selective Doping Strategy of Carbon Anodes with Remarkable K‐Ion Storage Capacity

et al. 2020

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The limited potassium‐ion intercalation capacity of graphite hampers development of potassium‐ion batteries (PIB). Edge‐nitrogen doping is an effective approach to enhance K‐ion storage in carbonaceous materials. One shortcoming is the lack of precise control over producing the edge‐nitrogen configuration. Here, a molecular‐scale copolymer pyrolysis strategy is used to precisely control edge‐nitrogen doping in carbonaceous materials. This process results in defect‐rich, edge‐nitrogen doped carbons (ENDC) with a high nitrogen‐doping level (up to 10.5 at %) and a high edge‐nitrogen ratio (87.6 %). The optimized ENDC exhibits a high reversible capacity of 423 mAh g−1, a high initial Coulombic efficiency of 65 %, superior rate capability, and long cycle life (93.8 % retention after three months). This strategy can be extended to design other edge‐heteroatom‐rich carbons through pyrolysis of copolymers for efficient storage of various mobile ions.

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“…Polyaniline-co-polypyrrole (PACP) copolymer is generally used as a precursor to prepare porous carbons for supercapacitors, and sulfur-host in lithium-sulfur batteries. [36,37] However, these applications do rely on the porous architecture of the resultant carbons from PACP. In this work, we found the unique advantage of PACP as a precursor to prepare nitrogen-doped carbons as PIB anodes by tuning nitrogen-doping configuration, and crystalline structure.…”

Section: Resultsmentioning

confidence: 99%

A Site‐Selective Doping Strategy of Carbon Anodes with Remarkable K‐Ion Storage Capacity

et al. 2020

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Ferroelectric‐Enhanced Polysulfide Trapping for Lithium–Sulfur Battery Improvement

Cited by 167 publications

References 46 publications

In Situ Assembly of 2D Conductive Vanadium Disulfide with Graphene as a High‐Sulfur‐Loading Host for Lithium–Sulfur Batteries

In Situ Assembly of 2D Conductive Vanadium Disulfide with Graphene as a High‐Sulfur‐Loading Host for Lithium–Sulfur Batteries

A Site‐Selective Doping Strategy of Carbon Anodes with Remarkable K‐Ion Storage Capacity

A Site‐Selective Doping Strategy of Carbon Anodes with Remarkable K‐Ion Storage Capacity

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