Porous LiMn2O4 with Al2O3 coating as high-performance positive materials

• Published in: Ionics Vol. 25; no. 5; pp. 1991 - 1998
• Main Authors: Li, Shiyou, Zhu, Konglei, Zhao, Dongni, Zhao, Qiuping, Zhang, Ningshuang
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2019; Springer Nature B.V
• Subjects: Aluminum oxide; Cathodes; Chemistry; Chemistry and Materials Science; Coating; Condensed Matter Physics; Discharge; Electrochemical analysis; Electrochemistry; Electrode materials; Electron microscopes; Emission analysis; Energy Storage; Energy transmission; Inductively coupled plasma; Jahn-Teller effect; Lithium; Lithium manganese oxides; Lithium-ion batteries; Manganese; Morphology; Optical and Electronic Materials; Original Paper; Rechargeable batteries; Renewable and Green Energy; X-ray diffraction; Lithium-ion battery; Lithium manganese oxide; Al; Cathode; coated; O
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-018-2643-y

In order to improve the universality of LiMn 2 O 4 materials, LiMn 2 O 4 coated with Al 2 O 3 (LMO@Al) is prepared by a co-precipitated method to improve the electrochemical performance of the porous LiMn 2 O 4 cathode. The morphologies and microstructures are characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, and energy-dispersive spectroscopy. The electrochemical performances are investigated by galvanostatic charge-discharge test system and inductively coupled plasma emission spectrograph. The results show that the Al 2 O 3 coating uniformly as well as tightly coupled with LiMn2O4 particles. The LMO@Al cathode material also shows outstanding electrochemical behaviors. After 100 cycles, the capacitance can remain 98.6 and 91.2% at 25 and 55 °C, respectively. Moreover, the LMO@Al composite cycled reversibly at 25 °C for 10 C with stable discharge capacities of 94.4 mAh g −1 . Superior electrochemical stability of the LMO@Al can be attributed to the uniform coating which inhibited the manganese dissolution and Jahn-Teller effect of LiMn 2 O 4 materials as well as the decomposition of the electrode by HF corrosion. The LMO@Al obtained from this work can open a new possibility in high power lithium ion batteries application.