Regulating the Electronic Configuration of Spinel Zinc Manganate Derived from Metal–Organic Frameworks: Controlled Synthesis and Application in Anode Materials for Lithium-Ion Batteries

• DOI: 10.1021/acsami.2c06897
• Publication Date: 2022-08-12T18:04:55Z
• Authors: Wenqing Du; Jiawei Liu; Akif Zeb; Xiaoming Lin
• Keywords: Manganate; Carbon fibers

In recent years, transition metal oxides have been considered as the most promising anode materials due to their high theoretical capacity, low price, and abundant natural reserves. Among them, zinc manganate is used an electrode material for anodes, whose application mostly hindered its poor ionic/electronic conductivity. this work, a series of ZnMn2O4 (ZMO) are synthesized by hydrothermal technique coordinated with metal-organic framework-based high-temperature calcination process in lithium-ion batteries (LIBs). Meanwhile, study systematically explores influence carbon doping types organic ligands oxygen vacancies on electrochemical properties ZMO. Density functional theory (DFT) calculations experimental investigations reveal that introduction can enhance electronic conductivity, more active sites faster Li+ adsorption, resulting better performances. As expected, all ZMOs (PMA-ZMO, MI-ZMO, BDC-ZMO) derived from 1,2,4,5-benzenetetracarboxylic acid, 2-methylimidazole, 1,4-dicarboxybenzene achieve outstanding performance. conductivity significantly reduce activation energy transport, thereby accelerating diffusion kinetics lithiation/delithiation process. Furthermore, optimal ZMO 2-methylimidazole delivers reversible capacity 1174.7 mA h g-1 after 300 cycles at 0.1 A 600 0.5 cycles. After high-rate charge discharge cycles, specific rapidly recovers value greater than initial value, which proves unusual excellent rate property electrode. Hence, we conclude provides potential prospects LIBs.