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5074340 
Journal Article 
Design of high-performance cathode materials with single-phase pathway for sodium ion batteries: A study on P2-Na-x(LiyMn1-y)O-2 compounds 
Yang, L; Li, X; Ma, X; Xiong, S; Liu, Pan; Tang, Y; Cheng, S; Hu, YanYan; Liu, M; Chen, H 
2018 
Yes 
Journal of Power Sources
ISSN: 0378-7753 
Elsevier 
AMSTERDAM 
381 
171-180 
English 
WOS:000428009400020 
Sodium-ion batteries (SIBs) are an emerging electrochemical energy storage technology that has high promise for electrical grid level energy storage. High capacity, long cycle life, and low cost cathode materials are very much desired for the development of high performance SIB systems. Sodium manganese oxides with different compositions and crystal structures have attracted much attention because of their high capacity and low cost. Here we report our investigations into a group of promising lithium doped sodium manganese oxide cathode materials with exceptionally high initial capacity of similar to 223 mAh g(-1) and excellent capacity retentions, attributed primarily to the absence of phase transformation in a wide potential range of electrochemical cycling, as confirmed by in-operando X-ray diffraction (XRD), Rietveld refinement, and high-resolution Li-7 solid-state NMR characterizations. The systematic study of structural evolution and the correlation with the electrochemical behavior of the doped Cathode materials provides new insights into rational design of high-performance intercalation compounds by tailoring the composition and the crystal structure evolution in electrochemical cycling. 
Lithium excess cathodes; Layered transition metal oxides; Intercalation cathodes; Na ion batteries 
JOURNAL OF POWER SOURCES