Encapsulating Tin Nanoflowers into Microcapsules for High‐Rate‐Performance Secondary Battery Anodes through In Situ Polymerizing Oil‐in‐Water Interface,Energy Technology

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Encapsulating Tin Nanoflowers into Microcapsules for High‐Rate‐Performance Secondary Battery Anodes through In Situ Polymerizing Oil‐in‐Water Interface
Energy Technology ( IF 3.6 ) Pub Date : 2020-01-27 , DOI: 10.1002/ente.201901404
Tianli Han ₁ , Yong Wu ₁ , Yingyi Ding ₁ , Yan Zhong ₁ , Ping Zhou ₂ , Jinyun Liu ₁

Affiliation

Large volume expansion and structural breaking have been severe issues for emerging high‐performance secondary battery anodes. Herein, a novel microcapsule anode filled with tin (Sn) nanoflowers is presented, which is prepared through in situ interface polymerization of an oil‐in‐water emulsion system. The carbon shell of the microcapsules reduces the pulverization of the encapsulated Sn, and the voids inside the capsules provide efficient spaces for the volume change of Sn during lithiation–delithiation. The Sn‐filled microcapsules exhibit a high rate performance with a capacity decay rate as low as 0.38%, even after three rounds of repeated tests, and a stable capacity of 800 mAh g⁻¹ after 200 cycles at 380 mA g⁻¹. In addition, the electron transfer kinetics and Li‐ion diffusion are investigated, which indicate that the microcapsule system enables a good environment for both electron and ion transfer.

中文翻译：

通过原位聚合水包油界面将锡纳米花封装到微囊中，以实现高性能二次电池阳极

对于新兴的高性能二次电池阳极而言，大体积膨胀和结构破坏一直是严重的问题。本文中，提出了一种新型的填充有锡（Sn）纳米花的微胶囊阳极，该阳极是通过水包油乳液系统的原位界面聚合制备的。微胶囊的碳壳减少了封装的Sn的粉化，并且胶囊内部的空隙为锂化-脱锂过程中Sn的体积变化提供了有效的空间。上述Sn-填充的微胶囊表现出与一个容量衰减速率低至0.38％的高倍率性能，即使经过三轮的反复试验，以及800毫安g的稳定容量^-1在380毫安克200次循环后^-1。此外，还研究了电子转移动力学和锂离子扩散，这表明微胶囊系统为电子和离子转移提供了良好的环境。

更新日期：2020-01-27

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