TY - JOUR
T1 - Refining O3-Type Ni/Mn-Based Sodium-Ion Battery Cathodes via “Atomic Knife” Achieving High Capacity and Stability
AU - Yuan, Tao
AU - Li, Pengzhi
AU - Sun, Yuanyuan
AU - Che, Haiying
AU - Zheng, Qinfeng
AU - Zhang, Yixiao
AU - Huang, Shuai
AU - Qiu, Jian
AU - Pang, Yuepeng
AU - Yang, Junhe
AU - Ma, Zi Feng
AU - Zheng, Shiyou
N1 - Publisher Copyright:
© 2024 Wiley-VCH GmbH.
PY - 2025/1/29
Y1 - 2025/1/29
N2 - The O3-type NaNi0.5Mn0.5O2 (NM) layered cathode in sodium ion batteries (SIBs) undergoes structural distortion and capacity degradation during cycling, which seriously hinders its practical application. Herein, lanthanum (La) is employed as a dopant in O3-NaNi0.5Mn0.5-xLaxO2 (NML) cathodes, which triggered an “atomic knife” effect, reducing particle size, and stabilizing crystal structure. The larger La ions generated structural strain during grain growth at high temperatures, hindering the movement of grain boundaries and refining the size of NML particles. Comprehensive characterizations illuminated La doping-induced atomic site occupancy and phase transformations within NML. A competitive phase formation between layered NML and perovskite LaMnO3 (LMO) is observed. Spontaneously formed perovskite LMO provides surface protection. Moreover, strong La─O bonds expand the Na interlayer spacing, enhancing Na+-ion diffusion. Consequently, NML cathodes exhibit superior long-term cycling stability and ultrahigh rate capacities compared to pristine NM cathode and most currently reported layered cathodes for SIBs.
AB - The O3-type NaNi0.5Mn0.5O2 (NM) layered cathode in sodium ion batteries (SIBs) undergoes structural distortion and capacity degradation during cycling, which seriously hinders its practical application. Herein, lanthanum (La) is employed as a dopant in O3-NaNi0.5Mn0.5-xLaxO2 (NML) cathodes, which triggered an “atomic knife” effect, reducing particle size, and stabilizing crystal structure. The larger La ions generated structural strain during grain growth at high temperatures, hindering the movement of grain boundaries and refining the size of NML particles. Comprehensive characterizations illuminated La doping-induced atomic site occupancy and phase transformations within NML. A competitive phase formation between layered NML and perovskite LaMnO3 (LMO) is observed. Spontaneously formed perovskite LMO provides surface protection. Moreover, strong La─O bonds expand the Na interlayer spacing, enhancing Na+-ion diffusion. Consequently, NML cathodes exhibit superior long-term cycling stability and ultrahigh rate capacities compared to pristine NM cathode and most currently reported layered cathodes for SIBs.
KW - O3-type Ni/Mn-based cathode
KW - Sodium-ion batteries
KW - grain refinement
KW - second phase interface protection
KW - “atomic knife”
UR - http://www.scopus.com/inward/record.url?scp=85203696965&partnerID=8YFLogxK
U2 - 10.1002/adfm.202414627
DO - 10.1002/adfm.202414627
M3 - Article
AN - SCOPUS:85203696965
SN - 1616-301X
VL - 35
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 5
M1 - 2414627
ER -