Effects of aluminium and sodium co‐doping on the structural and electrochemical performances of the spinel LiMn2O4 cathode materials. (1st August 2016)

• Record Type: Journal Article
• Authors: Li, Yuzhu; Mao, Yanfang; Zhan, Taotao; Li, Chao; Xiao, Shunhua
• Is Part Of: Micro & nano letters. Volume 11:Number 8(2016)
• Page Start: 430
• Page End: 432
• Publication Date: 2016-08-01
• Subjects: lithium compounds -- sodium compounds -- electrochemical electrodes -- secondary cells -- sol‐gel processing -- X‐ray diffraction -- scanning electron microscopy -- electron diffraction; aluminium‐sodium codoping effects -- structural performance -- electrochemical performance -- lithium‐ion battery spinel cathode materials -- sol‐gel method -- X‐ray diffraction -- XRD -- scanning electron microscopy -- SEM -- electron diffraction spectroscopy -- crystallinity -- initial discharge capacity -- rate capability -- LiMn2O4 -- LiAl0.1Mn1.9O4 -- Li0.94Na0.06Al0.1Mn1.9O4; Nanotechnology -- Periodicals; Nanostructures -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1049/mnl.2016.0037
• Languages: English
• ISSNs: 1750-0443

Abstract

Abstract : The lithium‐ion battery cathode materials spinel LiMn2 O4, LiAl0.1 Mn1.9 O4 and Li0.94 Na0.06 Al0.1 Mn1.9 O4 materials are synthesised by sol–gel method. The structure, morphology and electrochemical performances of the aluminium and sodium co‐doped materials are studied by X‐ray diffraction measurement, scanning electron microscopy, and Electron diffraction spectroscopy, respectively. The results reveal that appropriate amount doping of aluminium and sodium does not change the spinel structure of LiMn2 O4 . Those materials have a good crystallinity and the sizes are approximately 150 nm. The initial discharge capacity of Li0.94 Na0.06 Al0.1 Mn1.9 O4 is 113.8 mAh/g at 0.5 C. Compared with the rate capability of LiMn2 O4, the discharge capacity of 107.5 mAh/g at 5 C for Li0.94 Na0.06 Al0.1 Mn1.9 O4 has 46.8% improvement. Obviously, aluminium and sodium co‐doping is a very effective way to improve LiMn2 O4 rate capability.