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The Interfacial Electronic Engineering in Binary Sulfiphilic Cobalt Boride Heterostructure Nanosheets for Upgrading Energy Density and Longevity of Lithium-Sulfur Batteries
Advanced Materials ( IF 29.4 ) Pub Date : 2021-09-04 , DOI: 10.1002/adma.202102338
Zhonglin Li 1, 2 , Pengyue Li 1, 3 , Xueping Meng 1 , Zhang Lin 4 , Ruihu Wang 1, 2, 3
Affiliation  

High gravimetric, areal and volumetric capacities together with long lifetime are key indexes for the applications of lithium–sulfur (Li-S) batteries in compact space. The sulfur host materials play pivotal roles in the practical deployment. Herein, one type of new heterostructure nanosheets composed of cobalt boride (CoB) on nitrogen, boron-codoped porous carbon (NBC), which is constructed through molten salt-assisted strategy using ZIF-67-encapsulated ZIF-8 as precursors is reported on. Benefiting from strong interfacial electronic interactions between binary sulfiphilic CoB and porous NBC, the CoB/NBC-S electrode exhibits the excellent cycling stability with low average capacity decay of 0.013% in ultralong 1500 cycles at high rate of 5 C. Remarkably, the electrode with high sulfur content of 82 wt% and high sulfur loading of 5.8 mg cm−2 delivers gravimetric capacity of 1309 mA h g−1, areal capacity of 7.59 mA h cm−2, and volumetric capacity of 1355 mA h cm−3 at 0.1 C. The favorable electrochemical performance can rival with the state-of-the-art of those in the reported nanosheets-based sulfur cathodes. This study provides new methodology for the design of heterostructure nanosheets of metal borides to achieve energy density and longevity of Li-S batteries.

中文翻译:

用于提高锂硫电池能量密度和寿命的二元亲硫钴硼化物异质结构纳米片的界面电子工程

高重量、面积和体积容量以及长寿命是锂硫(Li-S)电池在紧凑空间中应用的关键指标。硫主体材料在实际部署中起着举足轻重的作用。在此,一种由硼化钴 (CoB) 和硼共掺杂多孔碳 (NBC) 组成的新型异质结构纳米片,通过熔盐辅助策略构建,使用 ZIF-67 封装的 ZIF-8 作为前驱体。 . 受益于二元亚硫基 CoB 和多孔 NBC 之间强大的界面电子相互作用,CoB/NBC-S 电极表现出优异的循环稳定性,在 5 C 的高倍率下超长 1500 次循环中平均容量衰减仅为 0.013%。 82 wt% 的高硫含量和 5.8 mg cm 的高硫载量-2在 0.1 C 下提供 1309 mA hg -1 的重量容量,7.59 mAh cm -2 的面积容量和 1355 mAh cm -3 的体积容量。报道的基于纳米片的硫阴极中的那些技术。该研究为设计金属硼化物异质结构纳米片以实现锂硫电池的能量密度和寿命提供了新方法。
更新日期:2021-10-20
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