Drastic enhancement in the rate and cyclic behavior of LiMn2O4 electrodes at elevated temperatures by phosphorus doping. (1st October 2019)

• Record Type: Journal Article
• Authors: Hou, Yaolin; Chang, Kun; Tang, Hongwei; Li, Bao; Hou, Yan; Chang, Zhaorong
• Is Part Of: Electrochimica acta. Volume 319(2019)
• Page Start: 587
• Page End: 595
• Publication Date: 2019-10-01
• Subjects: Li-ion battery -- Cycling behavior -- P element doping -- LiMn2O4 electrodes; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.07.016
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Herein we provide an effective strategy for drastically improving the cyclic behavior and rate capability of an LiMn2 O4 (LMO) electrode at elevated temperature through P element doping. The P-doped LiMn2 O4 materials are characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectrometry analysis. The results show that the P element is effectively and uniformly doped within the LiMn2 O4 crystal lattice and is beneficial for growth of the truncated octahedral crystal structure. The electrochemical results reveal that P doping can greatly improve the cycling performance of LiMn2 O4 electrodes, especially improving the rate capability at elevated temperatures. At a high 10C rate of current density and 55 °C, the optimized LMO (1.5 wt% P) electrode shows the highest initial specific capacity of 101.2 mAh g −1, which become 74.4 mAh g −1 after 500 cycles, corresponding to 73.5% capacity retention. Under similar conditions, the LMO (2.5 wt% P) electrode shows an initial discharge capacity of 78.5 mA g −1, which become 72.2 mAh g −1 after 500 cycles, corresponding to 92.3% capacity retention. Graphical abstract: Image 1 Highlights: P-doped LiMn2 O4 was first successfully synthesized and investigated. Phosphorus was effectively and uniformly doped within the LiMn2 O4 crystal lattice. The P fluxing effect enhanced the truncated octahedral crystal structure growth. P-doped LiMn2 O4 has improved electrochemical performance at elevated temperatures.