Enhancement of lithium storage capacity and rate performance of Se-modified MnO/Mn3O4 hybrid anode material via pseudocapacitive behavior
(1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. College of Biological and Environmental Engineering, Changsha University, Changsha 410022, China;
3. Advanced Research Center, Central South University, Changsha 410083, China;
4. School of Metallurgy and Environment, Central South University, Changsha 410083, China)
2. College of Biological and Environmental Engineering, Changsha University, Changsha 410022, China;
3. Advanced Research Center, Central South University, Changsha 410083, China;
4. School of Metallurgy and Environment, Central South University, Changsha 410083, China)
Abstract: To improve rate and cycling performance of manganese oxide anode material, a precipitation method was combined with thermal annealing to prepare the MnO/Mn3O4/SeOx (x=0, 2) hybrid anode by controlling the reaction temperature of Mn2O3 and Se powders. At 3 A/g, the synthesized MnO/Mn3O4/SeOx anode delivers a discharge capacity of 1007 mA·h/g after 560 cycles. A cyclic voltammetry quantitative analysis reveals that 89.5% pseudocapacitive contribution is gained at a scanning rate of 2.0 mV/s, and the test results show that there is a significant synergistic effect between MnO and Mn3O4 phases.
Key words: lithium-ion battery; manganese oxide; anode material; pseudocapacitive behavior; synergistic effect