TY - JOUR
T1 - Role of Lithium Doping in P2-Na0.67Ni0.33Mn0.67O2for Sodium-Ion Batteries
AU - Xie, Yingying
AU - Gabriel, Eric
AU - Fan, Longlong
AU - Hwang, Inhui
AU - Li, Xiang
AU - Zhu, Haoyu
AU - Ren, Yang
AU - Sun, Chengjun
AU - Pipkin, Julie
AU - Dustin, Malia
AU - Li, Matthew
AU - Chen, Zonghai
AU - Lee, Eungje
AU - Xiong, Hui
N1 - Publisher Copyright:
©
PY - 2021/6/22
Y1 - 2021/6/22
N2 - P2-structured Na0.67Ni0.33Mn0.67O2 (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 LixNa0.67-yNi0.33Mn0.67O2+ (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 operando synchrotron X-ray diffraction, X-ray absorption spectroscopy, and 7Li solid-state nuclear magnetic resonance. Partial substitution of Na with Li leads to enhanced stability and slightly increased specific capacity compared to PNNMO. In contrast, when lithium is located primarily on octahedral TM sites, capacity is increased but at the cost of stability.
AB - P2-structured Na0.67Ni0.33Mn0.67O2 (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 LixNa0.67-yNi0.33Mn0.67O2+ (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 operando synchrotron X-ray diffraction, X-ray absorption spectroscopy, and 7Li solid-state nuclear magnetic resonance. Partial substitution of Na with Li leads to enhanced stability and slightly increased specific capacity compared to PNNMO. In contrast, when lithium is located primarily on octahedral TM sites, capacity is increased but at the cost of stability.
UR - http://www.scopus.com/inward/record.url?scp=85108569861&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.1c00569
DO - 10.1021/acs.chemmater.1c00569
M3 - Article
AN - SCOPUS:85108569861
SN - 0897-4756
VL - 33
SP - 4445
EP - 4455
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 12
ER -