文献类型：期刊文献

英文题名：Covalently bonded MXene@Antimonene heterostructure anode for fast lithium-ion storage

作者：Bo, Zheng[1];Zheng, Zhouwei[1];Huang, Yanzhong[1];Chen, Pengpeng[1];Yan, Jianhua[1];Cen, Kefa[1];Mo, Runwei[2];Yang, Huachao[1];Ostrikov, Kostya (Ken)[3,4]

机构：[1]Zhejiang Univ, Coll Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200030, Peoples R China;[3]Queensland Univ Technol QUT, Sch Chem & Phys, Brisbane, Qld 4000, Australia;[4]Queensland Univ Technol QUT, QUT Ctr Mat Sci, Brisbane, Qld 4000, Australia

年份：2024

卷号：485

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20240915634856);WOS:【SCI-EXPANDED(收录号:WOS:001197458000001)】；

基金：This work was supported by the Key R & D Program of Zhejiang Province (No. 2023C01128) , the National Natural Science Foundation of China (No. 52076188) and the Zhejiang Provincial Natural Science Foundation of China (No. LY23E060004) .

语种：英文

外文关键词：Lithium -ion batteries; Alloy anode materials; Covalent bonding; MXene heterostructures; Rate capability; Cycling stability

摘要：Alloying-type antimony (Sb) is a promising anode of lithium-ion batteries (LIBs) due to its high capacity compared to commercial intercalation-type graphite. However, Sb anodes show unsatisfactory rate performance and poor cycling stability. To address these challenges, covalently-bonded MXene@antimonene (MXene@AME) heterostructure is designed and synthesized. The deliberate combination of the electrostatic-driven self-assembly, custom-designed surface-grafted cationic groups, and a simple annealing treatment produces the AME nanosheets anchored onto conductive MXene matrix via Ti-O-Sb covalent bonding. The synthesized covalentlybonded heterostructure achieves advantageous features of reinforcing the structural stability, alleviating the volume expansion, improving charge transfer kinetics via Ti-O-Sb bonding, and reducing the Li-ion migration energy barrier at the heterointerfaces. Consequently, MXene@AME anode demonstrates outstanding rate capability (346 mAh g-1 at 10 A g-1) and exceptional cyclic stability (retention of 103.4% after 2,000 cycles at 1 A g-1), which are superior to most non-covalently-bonded alloying-type anodes. The lithiation/de-lithiation pathways and Li-ion storage mechanisms are revealed by in-situ potential-electrochemical impedance spectroscopy, in-situ XRD and ex-situ HRTEM, complemented with theoretical analysis. The heterostructure anodes undergo stepwise phase transformations across two states during discharging, followed by a direct reversion to the original phase upon charging, presenting an unusual asymmetric conversion mechanism. Moreover, a full cell was assembled using MXene@AME heterostructure anode and commercial NCM 523 cathode, which shows good rate capability and cyclic stability, proving its feasibility in practical applications.