Hierarchical Mo2C@CNT Hybrid Structure Formation for the Improved Lithium-Ion Battery Storage Performance

Nanomaterials

Muhammad Faizan¹  Kyung-Wan Nam¹  Shoaib Muhammad²  Dhanasekaran Vikraman³  Hyun-Seok Kim³  Jongwan Jung⁴  Sajjad Hussain⁴ 

[1] Department of Energy & Materials Engineering, Dongguk University-Seoul, Seoul 04620, Korea;Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea;Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 04620, Korea;Hybrid Materials Center (HMC), Sejong University, Seoul 05006, Korea;

关键词: hybrid;    Mo₂C;    Mo₂C@CNT;    TMCs;    CNT;    LIBs;   

DOI  :  10.3390/nano11092195

来源: DOAJ

【 摘 要 】

2-D transition metal carbides (TMCs)-based anode materials offer competitive performance in lithium-ion batteries (LIBs) owing to its excellent conductivity; cheaper, flexible uses; and superior mechanical stability. However, the electrochemical energy storage of TMCs is still the major obstacle due to their modest capacity and the trends of restacking/aggregation. In this report, the Mo₂C nanosheets were attached on conductive CNT network to form a hierarchical 2D hybrid structure, which not only alleviated the aggregation of the Mo₂C nanoparticle and facilitated the rapid transference of ion/electron, but also adapted effectually to the hefty volume expansion of Mo₂C nanosheets and prevented restacking/collapse of Mo₂C structure. Benefitting from the layered Mo₂@CNT hybrid structure, the charge/discharge profile produced a 200 mAh g⁻¹ discharge-specific capacity (second cycle) and 132 mAh g⁻¹ reversible-discharge discharge-specific capacity (after 100 cycles) at 50 mA g⁻¹ current density, with high-speed competency and superior cycle stability. The improved storage kinetics for Mo₂@CNT hybrid structure are credited to the creation of numerous active catalytic facets and association reaction between the CNT and Mo₂C, promoting the efficient electron transfer and enhancing the cycling stability.

【 授权许可】

Unknown