Perovskite-type RMnO3 (R = La, Nd, Eu) nanofibers with fast Li+ transport properties as anode for lithium-ion batteries

RMnO3 (R = La, Nd, Eu) perovskite-type nanofibers are constructed using electrospinning technology and applied as anode materials for lithium-ion batteries for the first time. The crystal structure, morphology, and valence state of the RMnO3 (R = La, Nd, Eu) are characterized by XRD, SEM, TEM, and XPS, respectively. The composition, cell parameters, and tolerance factor of the RMnO3 nanofibers have been refined using the Rietveld method. The influence of the synergy effect of Mn and rare-earth elements on electrochemical performance is discussed in detail. LaMnO3, NdMnO3, and EuMnO3 nanofibers display the initial discharge-specific capacity of 301, 428, and 649 mAh g+1 under the current density of 200 mA g+1. Rare earth elements contribute more capacity at low voltage platforms, which provides new insights for the application of rare earth. LaMnO3, NdMnO3, and EuMnO3 nanofibers maintained capacity retention rates of 65.9 %, 23.0 %, and 39.13 % after a current density of 2000 mA g+1, respectively. Subsequently, the 3DBVSMAPPER simulation analysis is carried out for the problem that similar structures produce large differences in rate performance. It is found that the big unit cell volume can enhance the amounts of Li+ diffusion channels, and thus improving directly the rate capability of the material. This work provides a new idea for understanding ion diffusion in dual-ion systems.

Automated summary

In this study, RMnO3 (R = La, Nd, Eu) perovskite-type nanofibers were prepared using electrospinning technology and utilized as anode materials for lithium-ion batteries for the first time. The crystal structure, morphology, and valence state of the nanofibers were characterized, and the influence of the synergy effect of Mn and rare-earth elements on electrochemical performance was discussed. The nanofibers displayed high initial discharge-specific capacity and maintained good capacity retention rates after high current density cycling. Additionally, simulation analysis revealed that the unit cell volume plays a role in enhancing Li+ diffusion channels and improving rate capability.