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Electrochemical intercalations of divalent ions inside Ni/Zn co-doped cobalt sulfide nanoparticle decorated carbon spheres with superior capacity.
Nanoscale ( IF 6.7 ) Pub Date : 2020-06-05 , DOI: 10.1039/d0nr02761h
Muhammad Asif 1 , Muhammad Rashad , Zeeshan Ali
Affiliation  

Among post-lithium ion batteries, magnesium ion batteries (MIBs) are receiving growing attention due to their divalent nature, intrinsic low cost, dendrite free cycling, and atmospheric stability. However, their realization is constrained because of the absence of suitable cathodes that can accommodate Mg2+ with fast reversibility. To bypass the sluggish movement of Mg2+ ions inside the cathode and utilize the full advantage of the Mg anode, a Mg2+/Li+ hybrid ion battery (MLIB) is introduced here with rationally designed porous Ni/Zn co-doped CoS2@C spheres as the cathode material. The Ni/Zn-CoS2@C cathode with high porosity and electrical conductivity showed an appreciable specific capacity of 158 mA h g−1 at 20 mA g−1 for MIBs, which was significantly boosted up to 667 mA h g−1 at a current density of 50 mA g−1 by employing Mg2+/Li+ hybrid electrolytes. Their specific capacity and the corresponding energy density (614 W h Kg−1) are the highest among MLIBs and comparable to those of lithium ion batteries. Furthermore, MLIBs displayed significant cycling stability by retaining the maximum specific capacities of 324.6 and 230 mA h g−1 at 100 and 500 mA g−1, respectively after 100 cycles. The excellent electrochemical properties of the synthesized cathodes are attributed to their high porosities and electrical conductivities, the synergistic effect of doped species and their capability to accommodate both Mg2+ and Li+ ions without side reactions. Various ex situ characterization tools were employed to develop further understanding of the intercalation chemistries and mechanisms of both Mg2+ and Li+ ions inside host materials.

中文翻译:

Ni / Zn共掺杂硫化钴纳米粒子内部二价离子的电化学嵌入修饰了具有卓越容量的碳球。

在后锂离子电池中,镁离子电池(MIB)由于其二价性质,固有的低成本,无枝晶的循环以及大气稳定性而受到越来越多的关注。但是,由于缺少合适的阴极,该阴极可以快速可逆地容纳Mg 2+,因此它们的实现受到限制。为了绕过阴极内部Mg 2+离子的缓慢运动并利用Mg阳极的全部优势,此处引入了Mg 2+ / Li +混合离子电池(MLIB),并设计了合理设计的多孔Ni / Zn共掺杂CoS 2个@C球作为阴极材料。Ni / Zn-CoS 2具有高孔隙率和电导率@C阴极表明158毫安汞柱的明显比容量-1在20mA克-1为的MIB,其显著升压到667毫安汞柱-1在50mA g的电流密度-1通过使用Mg 2+ / Li +混合电解质。它们的比容量和相应的能量密度(614 W h Kg -1)在MLIB中最高,可与锂离子电池相比。此外,MLIB通过在100和500 mA g -1时保持最大比容量324.6和230 mA hg -1表现出显着的循环稳定性。,分别经过100个周期。合成阴极的优异电化学性能归因于其高孔隙率和电导率,掺杂物质的协同效应以及它们能够容纳Mg 2+和Li +离子而无副反应的能力。各种异位表征工具用于进一步了解基质材料中Mg 2+和Li +离子的嵌入化学和机理。
更新日期:2020-07-09
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