Spinel LiMn2O4 integrated with coating and doping by Sn self-segregation

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2022-05, Vol.29 (5), p.909-916
• Main Authors: Shang, Huaifang, Xia, Dingguo
• Format: Article
• Language: English
• Subjects: Absorption spectra; Augers; Cathodes; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coating; Cobalt; Composites; Corrosion and Coatings; Doping; Electric vehicles; Electrode materials; Electrolytes; Electron energy; Electrons; Energy spectra; Energy storage; Glass; Jahn-Teller effect; Lithium; Lithium manganese oxides; Lithium-ion batteries; Manganese; Materials Science; Metallic Materials; Microscopy; Natural Materials; Nickel; Phase transitions; Radiation; Rechargeable batteries; Soft x rays; Surfaces and Interfaces; Sustainable development; Thin Films; Topography; Tribology; X ray absorption
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-022-2482-8

The development of high-performance and low-cost cathode materials is of great significance for the progress in lithium-ion batteries. The use of Co and even Ni is not conducive to the sustainable and healthy development of the power battery industry owing to their high cost and limited resources. Here, we report LiMn 2 O 4 integrated with coating and doping by Sn self-segregation. Auger electron energy spectrum and soft X-ray absorption spectrum show that the coating is Sn-rich LiMn 2 O 4 , with a small Sn doping in the bulk phase. The integration strategy can not only mitigate the Jahn-Teller distortion but also effectively avoid the dissolution of manganese. The as-obtained product demonstrates superior high initial capacities of 124 mAh·g −1 and 120 mAh·g −1 with the capacity retention of 91.1% and 90.2% at 25°C and 55°C after 50 cycles, respectively. This novel material-processing method highlights a new development direction for the progress of cathode materials for lithium-ion batteries.