Comparison of Li/Ni antisite defects in Fd-3 m and P4332 nanostructured LiNi0.5Mn1.5O4 electrode for Li-ion batteries. (20th September 2016)

• Record Type: Journal Article
• Authors: Gu, Yi-Jie; Li, Yu; Chen, Yun-Bo; Liu, Hong-Quan
• Is Part Of: Electrochimica acta. Volume 213(2016)
• Page Start: 368
• Page End: 374
• Publication Date: 2016-09-20
• Subjects: LiNi0.5Mn1.5O4 -- Li/Ni antisite defects -- phase transition; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.06.124
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Nano LiNi0.5 Mn1.5 O4 was synthesized through carbonate precipitation method. Li/Ni antisite defects exist in ordered as well as disordered LiNi0.5 Mn1.5 O4 . Disordered LiNi0.5 Mn1.5 O4 has a faster phase transition during discharge process. Abstract: Nanostructured LiNi0.5 Mn1.5 O4 with two different space groups (P43 32 and Fd-3m) were synthesized respectively, by using ammonia-mediated carbonate precipitation. X-ray diffraction and Rietveld refinement revealed that Li/Ni antisite defects exist in ordered as well as disordered LiNi0.5 Mn1.5 O4 cathode materials. Although the degree of Li/Ni antisite defects in Fd–3 m space group was larger compared with that in P43 32 space group, it showed better electrochemical performance. Electrochemical impedance spectroscopy confirmed that the LiNi0.5 Mn1.5 O4 with an Fd–3 m space group has lower charge transfer resistance. Combined with differential curves, we further revealed that there is a faster phase transition during the Li + intercalation process in the LiNi0.5 Mn1.5 O4 with an Fd–3 m space group than in the LiNi0.5 Mn1.5 O4 with a P43 32 space group.