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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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