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

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In Situ Assembly of 2D Conductive Vanadium Disulfide with Graphene as a High‐Sulfur‐Loading Host for Lithium–Sulfur Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-04-19 , DOI: 10.1002/aenm.201800201
Xingyu Zhu ₁ , Wen Zhao ₂ , Yingze Song ₁ , Qiucheng Li ₁ , Feng Ding ₂ , Jingyu Sun ₁ , Li Zhang ₁ , Zhongfan Liu _{1,

3}

Affiliation

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 VS₂/reduced graphene oxide nanosheets (G–VS₂) as a sulfur host. Benefiting from the 2D conductive and polar VS₂ interlayered within a graphene framework, the obtained G–VS₂ hybrids can effectively suppress the polysulfide shuttling, facilitate the charge transport, and cushion the volume expansion throughout the synergistic effect of structural confinement and chemical anchoring. With these advantageous features, the obtained sulfur cathode (G–VS₂/S) can deliver an outstanding rate capability (≈950 and 800 mAh g⁻¹ at 1 and 2 C, respectively) and an impressive cycling stability at high rates (retaining ≈532 mAh g⁻¹ after 300 cycles at 5 C). More significantly, it enables superior cycling performance of high‐sulfur‐loading cathodes (achieving an areal capacity of 5.1 mAh cm⁻² at 0.2 C with a sulfur loading of 5 mg cm⁻²) even at high current densities.

中文翻译：

石墨烯作为锂硫电池高硫负载基质的二维导电二硫化钒原位组装

锂硫（Li–S）电池因其高能量密度，低成本和对环境有益而被认为是最有前途的储能技术之一。但是，现有的缺点包括中间多硫化物的穿梭，硫的绝缘性以及硫阴极的体积变化很大，否则会导致容量衰减和不稳定的循环。为了克服这些挑战，本文提出了一种原位组装路线，以制造作为硫主体的VS ₂ /还原氧化石墨烯纳米片（G-VS ₂）。得益于石墨烯框架内夹层的二维导电和极性VS ₂，获得的G–VS ₂杂化物可以有效地抑制多硫化物的穿梭，促进电荷传输，并在结构限制和化学锚固的协同效应中缓冲体积膨胀。凭借这些有利的特性，获得的硫阴极（G–VS ₂ / S）可以提供出色的倍率能力（分别在1和2 C时≈950和800 mAh g ^-1）和在高倍率下的出色的循环稳定性（保持在5 C下经过300次循环后≈532 mAh g ^-1）。更重要的是，即使在高电流密度下，它也可以实现高硫负载阴极的出色循环性能（0.2 C时面积容量为5.1 mAh cm ^-2，硫负载量为5 mg cm ^-2）。

更新日期：2018-04-19

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