Design of surface protective layer of LiF/FeF3 nanoparticles in Li-rich cathode for high-capacity Li-ion batteries. (July 2015)

• Record Type: Journal Article
• Authors: Zhao, Taolin; Li, Li; Chen, Renjie; Wu, Huiming; Zhang, Xiaoxiao; Chen, Shi; Xie, Man; Wu, Feng; Lu, Jun; Amine, Khalil
• Is Part Of: Nano energy. Volume 15(2015:Jul.)
• Page Start: 164
• Page End: 176
• Publication Date: 2015-07
• Subjects: Lithium-ion battery -- Nanoparticle -- Surface protective layer -- Iron fluoride -- Li[Li0.2Ni0.2Mn0.6]O2; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2015.04.013
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Advanced lithium-ion batteries for renewable energy storage applications have become a major research interest in recent years. Much better performance can be realized by improvements in the material surface design, especially for the cathode materials. Here, we present a new design for a surface protective layer formed via a facile aqueous solution process in which a nano-architectured layer of LiF/FeF3 is epitaxially grown on bulk hierarchical Li-rich cathode Li[Li0.2 Ni0.2 Mn0.6 ]O2 . Coin cell tests of this material in the voltage range of 2–4.8 V indicated a high reversible capacity (260.1 mA h g −1 at 0.1 C), superior rate performance (129.9 mA h g −1 at 20 C), and excellent capacity retention. Differential scanning calorimetry showed good thermal stability. The enhanced capacity and cycling stability are attributed to the suppression of interfacial side reactions as well as the conversion reaction resulting from the introduction of LiF/FeF3 as a surface protective layer. Graphical abstract: Highlights: Hierarchical cathode Li[Li0.2 Ni0.2 Mn0.6 ]O2 was coated with LiF/FeF3 layer. A combination of conversion reaction and extraction/insertion reaction was explored. LiF/FeF3 layer with different coating thickness exhibited respective merits. Superior rate performance was obtained with an ultrathin layer. A significantly improved cycling performance was realized with a thicker layer.