A new route for the synthesis of Li2MnO3 based cathode material with enhanced first cycle efficiency and cycleability for lithium ion batteries

• Published in: Journal of power sources 2014-09, Vol.261, p.324-331
• Main Authors: Zhao, Wenwen, Harada, Shuji, Furuya, Yasuyuki, Yamamoto, Shinji, Noguchi, Hideyuki
• Format: Article
• Language: English
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrochemical performance; Exact sciences and technology; Improved cycleability; Li excess cathode; Lithium ion battery; Materials; Reduction-ion exchange
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2014.03.069

LixNi1/3Mn2/3O2 (x > 2/3) compounds have been synthesized from P3 type Na2/3Ni1/3Mn2/3O2 precursor through a new reduction-ion exchange method. The XRD patterns of LixNi1/3Mn2/3O2 show superlattice peak around 2θ = 20°, which is similar to that of the lithium-excess manganese based cathode materials. In contrast to sample obtained from traditional ion exchange method, the LixNi1/3Mn2/3O2 compound delivers LiNi1/2Mn1/2O2–Li2MnO3 solid solution type potential profiles and higher capacity than that of Li2/3Ni1/3Mn2/3O2, especially for the capacity delivered in high potential region. Moreover, it exhibits extremely small irreversible capacity at the initial cycle and small capacity loss during cycling in the voltage range 4.7–2.5 V. The structure and electrochemical properties of metallic elements substituted LixNi2/9M1/9Mn2/3O2 (M = Al, Co, Fe, Mg) were also studied. XRD and Raman spectra results suggest that small amount substitution of Ni with other metal ions does not affect the main structure of LixNi2/9M1/9Mn2/3O2 compounds. For Mg substituted compound, LixNi2/9Mg1/9Mn2/3O2, it exhibits improved cycleability compared with the other samples. •LixNi1/3Mn2/3O2 (x > 2/3) was synthesized via a new reduction-ion exchange method.•LixNi1/3Mn2/3O2 (x > 2/3) shows similar features as those of Li2MnO3 based cathode.•LixNi1/3Mn2/3O2 (x > 2/3) delivers enhanced first cycle efficiency and cycleability.•Mg substituted compound, LixNi2/9Mg1/9Mn2/3O2, exhibits improved cycleability.