Role of Lithium Doping in P2-Na_0.67Ni_0.33Mn_0.67O₂ for Sodium-Ion Batteries.

ABSTRACT: P2-structured Na_0.67Ni_0.33Mn_0.67O₂ (PNNMO) is a promising Na-ion battery cathode material, but its rapid capacity decay during cycling remains a hurdle. Li doping in layered transition-metal oxide (TMO) cathode materials is known to enhance their electrochemical properties. Nevertheless, the influence of Li at different locations in the structure has not been investigated. Here, the crystallographic role and electrochemical impact of lithium on different sites in PNNMO is investigated in Li _x Na_0.67-y Ni_0.33Mn_0.67O_2+δ (0.00 ≤ x ≤ 0.2, y = 0, 0.1). Lithium occupancy on prismatic Na sites is promoted in Na-deficient (Na < 0.67) PNNMO, evidenced by ex situ and

SUBMITTER: Xie Y 

PROVIDER: S-EPMC8276578 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature