| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
Transition-metal-mediated Thermal Stability of Spinel Cathode in Li-ion Battery by In Situ Neutron Scattering |
| Author(s) |
Yan Chen, Ke An |
| On-Site Speaker (Planned) |
Yan Chen |
| Abstract Scope |
The energy materials performance is intrinsically impacted by not only the average lattice structure but also the atom arrangement, valence and charge distribution of transition metal (TM) elements. The mechanism understandings of the structure transition and atom arrangement manipulation will accelerate the exploration of excellent materials for secondary rechargeable lithium-ion batteries use. Thanks to the capability of distinguishing TM elements, taking the high-voltage LiNi0.5Mn1.5O4 spinel cathode as an example, neutron scattering is used to pinpoint the thermal stability and kinetics of the transition and diffusions under annealing in the oxygen-deficient environment. In-situ neutron pair distribution function monitors the local structure and visualizes the destabilization of the TMO6 octahedra resulting from Mn4+ reduction. In-situ neutron diffraction reveals the spinel-to-layered-rock-salt transition and the TM atoms interdiffusion between the phases and between the crystallographic sites in the lattices. The Mn3+ formation is found to be the trigger to the spinel instability. |