Long cycle life of CoMn2O4 lithium ion battery anodes with high crystallinity

摘要: CoMn2O4 nanomaterials are prepared by a low temperature precipitation route employing metal acetates and NaOH. Structural changes, induced different annealing temperatures, comprehensively analyzed X-ray powder diffraction Raman spectroscopy. With rising the crystal lattice of undergoes changes ; AO4 tetrahedra expand due to thermally substitution Co2+ larger Mn2+ ions on A-site spinel structure, while in contrast, BO6 octahedra shrink since B-site becomes partially occupied smaller Co3+ account migrated Mn ions. particle sizes easily fine-tuned applying temperatures size increases with increasing temperature. During battery operation, pulverization reduction occurs regardless initial particles, but degree division particles during operation is dependent properties. Thus, contrary common assumption that nanostructuring anode material improves performance, samples largest exhibit excellent performance capacity retention 104% after 1000 cycles (compared 2nd cycle).