[PERSON]  
2 Engineering Laboratory for the Next Generation Power and Energy Storage Batteries, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; [EMAIL_ADDRESS]  
[PERSON]  
1 Collaborative Innovation Center of Nonferrous Metals of Henan Province, the Key Laboratory of Henan Province on Nonferrous Metallic Materials Science and Fabrication Technology, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China; [EMAIL_ADDRESS] (F.W. ); [EMAIL_ADDRESS] (Y.Z. ); [EMAIL_ADDRESS] (Y.W.) Y.W.) [PERSON]  
2 Engineering Laboratory for the Next Generation Power and Energy Storage Batteries, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; [EMAIL_ADDRESS]  
[PERSON]  
1 Collaborative Innovation Center of Nonferrous Metals of Henan Province, the Key Laboratory of Henan Province on Nonferrous Metallic Materials Science and Fabrication Technology, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China; [EMAIL_ADDRESS] (F.W. ); [EMAIL_ADDRESS] (Y.Z. ); [EMAIL_ADDRESS] (Y.W.) Y.W.) [PERSON]  
2 Engineering Laboratory for the Next Generation Power and Energy Storage Batteries, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; [EMAIL_ADDRESS]  
[PERSON]  
1 Collaborative Innovation Center of Nonferrous Metals of Henan Province, the Key Laboratory of Henan Province on Nonferrous Metallic Materials Science and Fabrication Technology, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China; [EMAIL_ADDRESS] (F.W. ); [EMAIL_ADDRESS] (Y.Z. ); [EMAIL_ADDRESS] (Y.W.) Y.W.) [PERSON]  
2 Engineering Laboratory for the Next Generation Power and Energy Storage Batteries, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; [EMAIL_ADDRESS]  
[PERSON]  
1 Collaborative Innovation Center of Nonferrous Metals of Henan Province, the Key Laboratory of Henan Province on Nonferrous Metallic Materials Science and Fabrication Technology, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China; [EMAIL_ADDRESS] (F.W. ); [EMAIL_ADDRESS] (Y.Z. ); 18438616683@163. Compared to FeCo\({}_{2}\)O\({}_{4}\) and NiCo\({}_{2}\)O\({}_{4}\), MgCo\({}_{2}\)O\({}_{4}\) (MCO) shows a lower theoretical capacity (\(\sim\)780 mAh g\({}^{-1}\)); the inactive MgO, which is formed during the first discharge, could remit volume variations effectively during the following electrochemical reactions, resulting in good cycling stability [23]. Up to now, there have been several reports about MCO as anode materials for LIBs. For instance, [PERSON] et al. [23] synthesized MgCo\({}_{2}\)O\({}_{4}\) nanowires on Ni foam via a hydrothermal method followed by annealing treatment. When used as anode materials for LIBs, it could deliver \(\sim\)940 mAh g\({}^{-1}\) at the current density of 2.5 A g\({}^{-1}\). Recently, [PERSON] et al. [22] reported multi-shelled MgCo\({}_{2}\)O\({}_{4}\) hollow microspheres synthesized by a solvothermal method and subsequent annealing process. Specifically, the MgCo\({}_{2}\)O\({}_{4}\) hollow microspheres exhibit high capacity of 1360 mAh g\({}^{-1}\) at 0.5 A g\({}^{-1}\) after 100 cycles. Microwave-assisted methods, due to microwave-induced accelerated kinetics, improved the nucleation rate, reduced in the reaction time, and has drawn large attention in the synthesis of oxide materials [24]. To the best of our knowledge, there is still no report on MgCo\({}_{2}\)O\({}_{4}\) synthesized by a microwave-assisted method. In this work, porous two-dimensional MgCo\({}_{2}\)O\({}_{4}\) nanosheets were synthesized by a facile microwave-assisted liquid phase method followed by annealing treatments. Through optimizing the annealing temperatures, MCO with a porous nanosheet structure can be attained.