Heterostructure SnSe2/ZnSe@PDA Nanobox for Stable and Highly Efficient Sodium‐Ion Storage,Advanced Energy Materials

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Heterostructure SnSe2/ZnSe@PDA Nanobox for Stable and Highly Efficient Sodium‐Ion Storage
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-04-24 , DOI: 10.1002/aenm.202000741
Pei Liu ₁ , Jun Han ₁ , Kunjie Zhu ₁ , Zihao Dong ₁ , Lifang Jiao ₁

Affiliation

Rationally designed electrode materials with high capacity, long cycle life, and low cost are indispensable for sodium‐ion batteries. Herein, a hierarchical nanobox consisting of a heterojunction bimetallic selenide yolk and polydopamine shell (denoted as SnSe₂/ZnSe@PDA) is engineered and fabricated successfully. Owing to the charge redistribution and lattice distortion at the hetero‐phase boundaries, Na⁺ ions can be easily adsorbed and transferred swiftly, facilitating the reaction kinetics and promoting cycling behavior. By means of the hollow structure and elastic polymer shell, this approach can synergistically alleviate volume fluctuation and the aggregation of active nanomaterials during cycling. This material delivers a high reversible capacity of 616 mA h g^‐1 at 1 A g^‐1 over 1000 long‐term cycles, and superior rate capability, which provides more possibilities for the practical applications of energy storage in the future.

中文翻译：

异质结构SnSe2 / ZnSe @ PDA纳米盒可稳定高效地存储钠离子

合理设计的高容量，长寿命和低成本电极材料对于钠离子电池来说是必不可少的。本文成功设计并制备了由异质结双金属硒化卵黄和聚多巴胺壳组成的分层纳米盒（表示为SnSe ₂ / ZnSe @ PDA）。由于异相边界处的电荷重新分布和晶格畸变，Na ⁺离子可以很容易地被吸附和快速转移，从而促进了反应动力学并促进了循环行为。通过中空结构和弹性聚合物壳，这种方法可以协同缓解循环过程中活性纳米材料的体积波动和聚集。这种材料具有616 mA hg ^-1的高可逆容量在1000个长期循环中以1 A g ^-1的功率运行，并具有出色的速率能力，这为将来的储能实际应用提供了更多可能性。

更新日期：2020-06-23

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