Cobalt-doped TiO2@C hierarchical nanocomposites derived from Ti3C2 MXene as cathodes for hybrid magnesium-lithium batteries

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外文摘要：TiO2 has been explored in hybrid magnesium-lithium batteries(HMLBs)due to the advantages of low self-discharge and small volume expansion during ion insertion.However,how to improve the inherently low ionic and electrical conductivity of TiO2 is the problem that needs to be solved.In this work,a smart strategy is adopted to prepare cobalt-doped TiO2@C(Co4+-TiO2@C)hierarchical nanocomposite derived from Co(Ⅱ)(OH)n@Ti3C2.Compared with TiO2@C(without cobalt doping),Co4+-TiO2@C shows the highest specific capacity(154.7 mAh·g-1 at 0.1 A·g-1 after 200 cycles)and extraordinary rate performance in HMLBs.The excellent electrochemical performance of Co4+-TiO2@C is ascribed to the synergistic effect of the hierarchical structure and cobalt-doping.Both experimental results and density functional theory(DFT)calculation reveal that the cobalt-doping has effectively improved the electronic conductivity and reduced the Li4 migration barrier.This work provides a new insight to design TiO2-based cathode materials with high-performance in HMLBs.

外文关键词：

Ti3C2 MXeneTiO2hybrid magnesium-lithium batterieshierarchical structurecobalt-doping

作者：

Xiaohui Li、Yakun Tang、Lang Liu、Yue Zhang、Yang Gao、Mao Qian、Wenjie Ma

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作者单位：

State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,College of Chemistry,Xinjiang University,Urumqi 830017,China

基金：

National Natural Science Foundation of ChinaGraduate Research Innovation Project of XinjiangDoctoral Innovation Program of Xinjiang University

项目编号：

22278347XJGRI2017002XJUBSCX-2017012

出版年：

2024

DOI：

10.1007/s12274-023-5701-3

纳米研究(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.17(1)

参考文献量43