Alkali and alkaline ions co-substitution of P2 sodium layered oxides for sodium ion batteries
Document Type
Article
Publication Date
5-1-2023
Abstract
Alkali and alkaline ion substitutions enhance the electrochemical properties of P2 sodium layered oxide, while the effect on electrochemical property enhancement of alkali and alkaline ions co-substitution is still unclear. In this work, the structural and electrochemical properties of the Li alkali and Mg alkaline ions co-substituted P2 layered oxide Na0.67(Li0.5Mg0.5)0.1(Ni0.33Mn0.67)0.9O2 are investigated in detail. Compared to the pristine and single-ion substituted materials, the co-substituted material shows an enhanced cycling performance with a reversible capacity of 127 mAh/g and a capacity retention of 75% over 100 cycles at 0.5C. Galvanostatic intermittent titration technique (GITT) and cyclic voltammetry (CV) results show that the Li and Mg synergistically improve the ion diffusion. Moreover, the structure stability is also improved by the Li and Mg co-substitution that is clarified by operando X-ray diffraction (XRD) measurements. These results explain the origin of the enhanced electrochemical properties of the Li/Mg co-substituted P2 layered oxides for sodium ion batteries.
Keywords
Sodium ions batteries, Sodium layered oxides, Alkali and alkaline elements co -substitution, Neutron diffraction, Structural evolution
Divisions
PHYSICS
Funders
Guangdong Basic and Applied Basic Research Foundation [Grant No: 2019B1515120028; FRGS/1/2018/STG02/UM/02/10],Ministry of Education, Malaysia [Grant No: GPF 038B2018],Universiti Malaya
Publication Title
Chinese Journal of Structural Chemistry
Volume
42
Issue
5
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS