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Synergistic Engineering of Se Vacancies and Heterointerfaces in Zinc-Cobalt Selenide Anode for Highly Efficient Na-Ion Batteries
Small ( IF 13.0 ) Pub Date : 2022-06-16 , DOI: 10.1002/smll.202202582 Ying Xiao 1 , Yue Miao 1 , Shuang Wan 1 , Yang-Kook Sun 2 , Shimou Chen 1
Small ( IF 13.0 ) Pub Date : 2022-06-16 , DOI: 10.1002/smll.202202582 Ying Xiao 1 , Yue Miao 1 , Shuang Wan 1 , Yang-Kook Sun 2 , Shimou Chen 1
Affiliation
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The exploitation of effective strategies to accelerate the Na+ diffusion kinetics and improve the structural stability in the electrode is extremely important for the development of high efficientcy sodium-ion batteries. Herein, Se vacancies and heterostructure engineering are utilized to improve the Na+-storage performance of transition metal selenides anode prepared through a facile two-in-one route. The experimental results coupled with theoretical calculations reveal that the successful construction of the Se vacancies and heterostructure interfaces can effectively lower the Na+ diffusion barrier, accelerate the charge transfer efficiency, improve Na+ adsorption ability, and provide an abundance of active sites. Consequently, the batteries based on the constructed ZnSe/CoSe2-CN anode manifest a high initial Coulombic efficiency (97.7%), remarkable specific capacities (547.1 mAh g–1 at 0.5 A g–1), superb rate capability (362.1 mAh g–1 at 20 A g–1), as well as ultrastable long-term stability (1000 cycles) with a satisfied specific capacity (535.6 mAh g–1) at 1 A g–1. This work facilitates an in-depth understanding of the synergistic effect of vacancies and heterojunctions in improving the Na+ reaction kinetics, providing an effective strategy to the rational design of key materials for high efficiency rechargeable batteries.
中文翻译：
用于高效钠离子电池的硒化锌钴负极中硒空位和异质界面的协同工程
开发有效的策略来加速Na +扩散动力学并提高电极的结构稳定性对于开发高效钠离子电池极为重要。在此，利用Se空位和异质结构工程来提高通过简单的二合一路线制备的过渡金属硒化物负极的Na +存储性能。实验结果结合理论计算表明，Se空位和异质结构界面的成功构建可以有效降低Na +扩散势垒，加速电荷转移效率，提高Na +吸附能力强，并提供丰富的活性位点。因此，基于所构建的 ZnSe/CoSe 2 -CN 负极的电池表现出较高的初始库仑效率 (97.7%)、显着的比容量 (547.1 mAh g -1 at 0.5 A g -1 )、出色的倍率性能 (362.1 mAh g –1 at 20 A g –1 )，以及超稳定的长期稳定性（1000 次循环），在 1 A g –1下具有令人满意的比容量 (535.6 mAh g –1 ) 。这项工作有助于深入了解空位和异质结在改善 Na +反应动力学，为高效充电电池关键材料的合理设计提供了有效的策略。
更新日期：2022-06-16
中文翻译：
用于高效钠离子电池的硒化锌钴负极中硒空位和异质界面的协同工程
开发有效的策略来加速Na +扩散动力学并提高电极的结构稳定性对于开发高效钠离子电池极为重要。在此，利用Se空位和异质结构工程来提高通过简单的二合一路线制备的过渡金属硒化物负极的Na +存储性能。实验结果结合理论计算表明，Se空位和异质结构界面的成功构建可以有效降低Na +扩散势垒，加速电荷转移效率，提高Na +吸附能力强，并提供丰富的活性位点。因此，基于所构建的 ZnSe/CoSe 2 -CN 负极的电池表现出较高的初始库仑效率 (97.7%)、显着的比容量 (547.1 mAh g -1 at 0.5 A g -1 )、出色的倍率性能 (362.1 mAh g –1 at 20 A g –1 )，以及超稳定的长期稳定性（1000 次循环），在 1 A g –1下具有令人满意的比容量 (535.6 mAh g –1 ) 。这项工作有助于深入了解空位和异质结在改善 Na +反应动力学，为高效充电电池关键材料的合理设计提供了有效的策略。
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