P2-type Na0.8(Li0.33Mn0.67-xTix)O2 doped by Ti as cathode materials for high performance sodium-ion batteries

Ti substituted P2-phase Na0.8(Li0.33Mn0.67-xTix)O2 (x = 0, 0.05, 0.1 and 0.2) cathodes are synthesized by a simple sol-gel method. The effects of Ti substitution on the crystal structure, morphology and electrochemical performances of Na0.8(Li0.33Mn0.67-xTix)O2 are also analyzed. Combining the advan...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-01, Vol.815, p.152402, Article 152402
Main Authors: Ma, Xiao-Hang, Li, Le-Le, Cheng, Long, Qiao, Fan, Ye, Yuan-Yuan, Li, Na, Sha, Mao-Lin, Zi, Zhen-Fa, Dai, Jian-Ming
Format: Article
Language:English
Subjects:
Cathode
Cathodes
Crystal structure
Diffusion rate
Electrochemical analysis
Electrode materials
Materials substitution
Morphology
Na0.8(Li0.33Mn0.67-xTix)O2
Rechargeable batteries
Sodium-ion batteries
Sol-gel processes
Stability analysis
Structural stability
Ti substitution
Titanium
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Summary:Ti substituted P2-phase Na0.8(Li0.33Mn0.67-xTix)O2 (x = 0, 0.05, 0.1 and 0.2) cathodes are synthesized by a simple sol-gel method. The effects of Ti substitution on the crystal structure, morphology and electrochemical performances of Na0.8(Li0.33Mn0.67-xTix)O2 are also analyzed. Combining the advantages of smaller particle size, enhanced structural stability and higher Na+ diffusion rate, the sample for x = 0.1 exhibits a high initial coulombic efficiency of 87.8%, good cyclic stability of 121 mA h g−1 after 100 cycles, and an outstanding rate performance of 85 mA h g−1 at 500 mA g−1. These results suggest that Ti substitution can be an effective method to enhance the electrochemical properties of P2-type Na0.8(Li0.33Mn0.67-xTix)O2 cathodes. •The properties of P2–Na0.8(Li0.33Mn0.67)O2 cathode are systematically studied.•Proper Ti doping in Na0.8(Li0.33Mn0.67)O2 enhances the electrochemical performances.•Na0.8(Li0.33Mn0.57Ti0.1)O2 is a competitive cathode for sodium-ion batteries.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.152402