Engineering Fe and V Coordinated Bimetallic Oxide Nanocatalyst Enables Enhanced Polysulfides Mediation for High Energy Density Li-S Battery,Small

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Engineering Fe and V Coordinated Bimetallic Oxide Nanocatalyst Enables Enhanced Polysulfides Mediation for High Energy Density Li-S Battery
Small ( IF 13.0 ) Pub Date : 2022-06-19 , DOI: 10.1002/smll.202202557
Hao Cheng ₁ , Shichao Zhang _{2,

3} , Siyuan Li _{2,

3} , Cheng Gao ₁ , Sihan Zhao _{1,

4} , Yingying Lu _{2,

3} , Miao Wang ₁

Affiliation

Lithium sulfur (Li-S) batteries are expected to become the next-generation rechargeable energy storage devices owing to their high theoretical energy density, environmental benignity, and economic benefits. However, the undesirable lithium polysulfides (LiPSs) shuttling and sluggish redox kinetics of sulfur electrochemistry severely degenerate the wide-ranging electrochemical performances, hindering the commercialization process of Li-S batteries. Herein, a Fe and V coordinated bimetallic oxide FeVO₄ (denote FVO) nanocatalyst with three-dimensional (3D) ordered structure is thoughtfully tailored and cooperated with the commercialized carbon nanotubes (CNT) to modify polypropylene (PP) separator for achieving high efficiencies of restraining the LiPSs shuttling and boosting the redox conversion of sulfur species. The Fe and V coordinated bimetallic oxide demonstrates enhanced anchoring and catalyzing activities toward sulfur species than single metal oxides of Fe and V with homometallic valence states due to the reconfiguration of the 3d-band. Impressively, the Li-S pouch cell with the FVO/CNT@PP separator achieves an energy density up to 341 Wh kg⁻¹. The bimetallic oxide nanocatalyst used in this work enlightens a new designing route toward the separator modification for the development of high energy density Li-S batteries.

中文翻译：

工程 Fe 和 V 配位双金属氧化物纳米催化剂可增强多硫化物介导的高能量密度 Li-S 电池

锂硫（Li-S）电池凭借其高理论能量密度、环境友好性和经济效益等优点有望成为下一代可充电储能装置。然而，不希望的多硫化锂（LiPS）穿梭和硫电化学的缓慢氧化还原动力学严重退化了广泛的电化学性能，阻碍了锂硫电池的商业化进程。在此，Fe和V配位的双金属氧化物FeVO ₄（表示FVO）具有三维（3D）有序结构的纳米催化剂经过精心定制，并与商业化的碳纳米管（CNT）合作，对聚丙烯（PP）隔膜进行改性，以实现抑制LiPS穿梭和促进硫的氧化还原转化的高效率物种。由于 3d 带的重新配置，Fe 和 V 配位的双金属氧化物比具有同金属价态的 Fe 和 V 的单金属氧化物显示出增强的对硫物质的锚定和催化活性。令人印象深刻的是，带有 FVO/CNT@PP 隔膜的 Li-S 软包电池实现了高达 341 Wh kg ^{-1的能量密度}. 这项工作中使用的双金属氧化物纳米催化剂为开发高能量密度锂硫电池的隔膜改性开辟了一条新的设计路线。

更新日期：2022-06-19

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