In situ magnetometry study on the origin of anomalously capacity in transition metal sulfides

ChemPhysMater Pub Date : 2023-07-01 DOI:10.1016/j.chphma.2023.01.001

Yan Liu , Yuanyuan Han , Shuxuan Liao, Fangchao Gu, Hengjun Liu, Xixiang Xu, Zhiqiang Zhao, Xiancheng Sang, Qinghao Li, Weijin Kong, Qiang Li

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Abstract

Cobalt sulfides are considered as promising candidates for lithium-ion battery (LIB) anode materials with high energy densities. Their energy storage mechanism is widely understood to involve the traditional intercalation and conversion reaction. However, these conventional mechanisms are unable to explain the storage capacities of certain materials which exceed the theoretical limit. Here, utilizing advanced in situ magnetometry to detect the magnetization evolution of Co_1-_xS LIBs in real time, it is demonstrated that the Co-catalytic lithium storage process and interfacial space charge storage mechanism are strongly related to the additional capacity of cobalt sulfides. During discharge, a Co/Li₂S interface is formed, wherein the Co nanoparticles and Li₂S could store a large amount of polarized electrons Li⁺, respectively. Subsequently, the electrons stored in Co are transferred to the polymeric film, forming radical anions and contributing extra capacity. These findings reveal the charge storage mechanisms of transition metal sulfides and highlight the critical role of magnetic testing in the investigation of energy storage mechanisms.

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过渡金属硫化物异常容量成因的原位磁强计研究

硫化钴被认为是具有高能量密度的锂离子电池（LIB）阳极材料的有前途的候选者。它们的储能机理被广泛理解为涉及传统的插层和转化反应。然而，这些传统机制无法解释某些材料的储存能力超过理论极限。在这里，利用先进的原位磁强计实时检测Co1-xS-LIBs的磁化演变，表明钴催化锂存储过程和界面空间电荷存储机制与钴硫化物的附加容量密切相关。在放电过程中，形成了Co/Li2S界面，其中Co纳米颗粒和Li2S可以分别存储大量的极化电子Li+。随后，储存在Co中的电子转移到聚合物膜上，形成自由基阴离子并贡献额外的容量。这些发现揭示了过渡金属硫化物的电荷存储机制，并突出了磁性测试在研究能量存储机制中的关键作用。

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来源期刊

ChemPhysMater

CiteScore

3.90

自引率

0.00%

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