In-Situ Assembled VS4 as a Polysulfide Mediator for High-Loading Lithium–Sulfur Batteries,ACS Energy Letters

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In-Situ Assembled VS4 as a Polysulfide Mediator for High-Loading Lithium–Sulfur Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-03-16 , DOI: 10.1021/acsenergylett.0c00292
Liu Luo ₁ , Jianyu Li ₁ , Hooman Yaghoobnejad Asl ₁ , Arumugam Manthiram ₁

Affiliation

A unique three-dimensional (3D) hybrid architecture configured with vanadium tetrasulfide (VS₄) nanomediators uniformly anchored in a reduced graphene oxide scaffold (VS₄@RGO) is fabricated as a sulfur host via a facile in-situ assembly route. In the hybrid structure, the conductive, porous RGO skeleton functions as 3D electron channels and polysulfide reservoirs, effectively localizing the diffusing polysulfides. Meanwhile, the sulfiphilic VS₄ nanoparticles grown in situ in the 3D matrix act as a polysulfide mediator to offer sufficient polysulfide-anchoring and catalytic sites. The polysulfide adsorptivity and redox-conversion reversibility are substantially improved, as validated by first-principles calculations and in-situ XRD analysis. As a result, the Li–S cells achieve a low capacity-fading rate of 0.07% per cycle after 500 cycles. Furthermore, the assembled Li–S pouch cells with 200 mg of sulfur mass also deliver a high reversible discharge capacity of 730 mA h g^–1 (146 mA h) after 50 cycles.

中文翻译：

原位组装VS ₄作为高负荷锂硫电池的多硫化物介体

通过简便的原位组装路线，将均匀地锚定在还原的氧化石墨烯支架（VS ₄ @RGO）中的由四硫化钒（VS ₄）纳米介体构成的独特三维（3D）杂化架构作为硫主体。在混合结构中，导电的多孔RGO骨架充当3D电子通道和多硫化物储集层，有效地定位了扩散的多硫化物。同时，原位生长的嗜硫VS ₄纳米颗粒3D基质中的Pb充当多硫化物介质，提供足够的多硫化物固定和催化位点。第一原理计算和原位XRD分析证实，聚硫化物的吸附性和氧化还原转化可逆性得到了显着改善。结果，Li-S电池在500个循环后达到了每循环0.07％的低容量衰减率。此外，组装后的硫含量为200 mg的Li–S袋式电池在50个循环后还具有730 mA hg ^–1（146 mA h）的高可逆放电容量。

更新日期：2020-04-23

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