A Multifunctional Silly‐Putty Nanocomposite Spontaneously Repairs Cathode Composite for Advanced Li−S Batteries,Advanced Functional Materials

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A Multifunctional Silly‐Putty Nanocomposite Spontaneously Repairs Cathode Composite for Advanced Li−S Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-10-16 , DOI: 10.1002/adfm.201804777
Zhi Chang _{1,

2} , Yibo He _{1,

2} , Han Deng _{1,

2} , Xiang Li _{1,

2} , Shichao Wu ₁ , Yu Qiao _{1,

2} , Pengfei Wang ₃ , Haoshen Zhou _{1,

2,

3}

Affiliation

Although lithium–sulfur batteries have been regarded as one of the most promising candidates for high efficient energy storage devices, however, their practical application are still hindered by the notorious “shuttle effect” and instability of cathode structure during cycling. In this work, conductive reduced graphene oxides nanosheets added–putty (rGO–putty ) adaptive functional interlayer is designed to effectively suppress the diffusion of polysulfides while simultaneously promoted the dynamic protection of the whole cathode structure during cycling. Consequently, largely suppressed polysulfides diffusion combined with the greatly enhanced cathode stability is achieved while the all‐around conductive protecting layer is formed benefited from the viscoelasticity property of rGO–putty. As a result, a capacity of 586 mAh g⁻¹ is demonstrated after long‐cycling term of 1000 cycles and high cycling stability of only 0.03% capacity decay per cycle is exhibited. The largely enhanced electrochemical performance suggests the important role of the rGO–putty in suppressing the “shuttle effect” and maintaining the integrity of the cathode material.

中文翻译：

多功能的硅腻子纳米复合材料可自发修复高级锂电池的正极复合材料。

尽管锂硫电池已被视为高效储能设备的最有希望的候选者之一，但是，其臭名昭著的“穿梭效应”和循环过程中阴极结构的不稳定性仍然阻碍了锂硫电池的实际应用。在这项工作中，设计了导电的还原性氧化石墨烯纳米片-putty（rGO-putty）自适应功能中间层，旨在有效抑制多硫化物的扩散，同时促进循环过程中整个阴极结构的动态保护。因此，得益于rGO-putty的粘弹性，可以在很大程度上抑制聚硫化物的扩散，并大大提高阴极的稳定性，同时形成全方位的导电保护层。结果，容量为586 mAh g在1000个循环的长期循环条件下证明^-1，并且显示出高循环稳定性，每个循环仅显示0.03％的容量衰减。电化学性能的大幅提高表明rGO –putty在抑制“穿梭效应”和保持阴极材料完整性方面的重要作用。

更新日期：2018-10-16

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