Synthesis Of Porous MnO/C In Choline Chloride-ethylene Glycol As An Anode Material For Lithium Ion Battery

MnO is a promising anode material for lithium ion batteries due to its high theoretical specific capacity,smaller voltage hysteresis,suitable reversible potential,high tap density,abundant resources,low cost and environment friendly.However,the huge volume changes and poor electrical conductivities result in a poor cycle-stability and rate performance,which severely limited its practical application.In this paper,a novel eutectic-choline chloride-ethylene glycol eutectic was used to prepare porous MnO/C microspheres using NH₄HCO₃ and MnCl2·4H2O as the raw materials and sucrose as carbon source.The structures,morphologies and electrochemical properties of the prepared MnO/C composites were characterized by BET,FE-SEM,SEM,XRD and electrochemical tests.MnO/C microspheres were prepared in choline chloride-ethylene glycol,involving a formation of MnCO₃ microspheres through a coprecipitation reaction between NH₄HCO₃?0.8 mol·L-1?and MnCl2?0.4 mol·L-1?with a mole ration of 2:1 at 35 ? for 4 h and then a subsequent heat treatment of MnCO₃/sucrose mixture with the mass ratio of 4:10 at 650 ? for 6 h in N2.The prepared MnO/C microspheres have average size of 1?2 pm and a specific surface area of 127.70m2.g-1,which consist of 5?50 nm nanoparticles and?11.50 nm mesopores.As-synthesized MnO/Cmicrospheres deliver a dischagrge capacity of 831.5 mAh·g-1 with a capacity retention rate?100%at 1 C after 50 cycles.When charged/discharged at 0.5 C,1 C,2 C and 3 C,its discharge capacity is 885.7,794.0,725.1 and 670.2 mAh·g-1,respectively.These results indicate that the MnO/C microspheres prepaed in choline chloride-ethylene glycol have a good cycle-stability and rate performance.