Impact of Annealing Time on Lithium Local Environment of LiMn_(0.5)Ni_(0.5)O_2: DFT-Supported ~6Li Solid-State NMR Study

摘要

To quench the thirst of ever-increasing demand for high energy and low-Co lithium-ion batteries (LIB), LiMn_(0.5)Ni_(0.5)O_2 has received considerable attention as a promising alternative cathode. However, it has been plagued by the structural failure driven by the irreversible phase change upon subsequent cycling and the structural degradation caused by the unavoidable Li/Ni exchange. This brings the importance of understanding the relation with lithium local environments and domains on overall electrochemical properties of materials.