Tellurium: A High-Performance Cathode for Magnesium Ion Batteries Based on a Conversion Mechanism

被引：57
作者：
Chen, Ze [1 ]
Yang, Qi [1 ]
Wang, Donghong [1 ]
Chen, Ao [1 ]
Li, Xinliang [1 ]
Huang, Zhaodong [1 ]
Liang, Guojin [1 ]
Wang, Ying [2 ]
Zhi, Chunyi [1 ]
机构：
[1] City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Hong Kong 999077, Peoples R China
[2] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China
来源：
ACS NANO | 2022年 / 16卷 / 04期
基金：
国家重点研发计划;
关键词：
magnesium ion batteries; tellurium; conversion-type mechanism; shuttle effect; carbon host materials; HIGH-CAPACITY; MG; SPHERES;
D O I：
10.1021/acsnano.1c07939
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Magnesium ion batteries (MIBs), due to the low redox potential of Mg, high theoretical capacity, dendrite-free magnesiation, and safe nature, have been recognized as a post-lithium energy storage system. However, an ongoing challenge, sluggish Mg2+ kinetics in the small number of available cathode materials of MIBs, restricts its further development. The existing cathodes mostly deliver unsatisfactory capacity with poor cycling life based on the traditional ion-intercalation mechanism. Herein, we fabricated a conversion-type Mg parallel to Te battery based on a reversible two-step conversion reaction (Te to MgTe2 to MgTe). High discharge capacities (387 mAh g(-1)) and rate capability (165 mAh at 5 A g(-1)) can be achieved. The diffusivity of Mg2+ can reach 3.54 x 10(-8) cm(2) s(-1), enabled by the high electrical conductivity of Te and increased surface conversion sites. Subsequently, ab initio molecular dynamics simulation was also carried out to further confirm the conversion mechanism and fast Mg2+ transportation kinetics.
引用
收藏
页码：5349 / 5357
页数：9
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