Influence of lithium content on the electrochemical performance of Li1+x(Mn0.533Ni0.233Co0.233)1−xO2 cathode materials

• Published in: Journal of power sources 2012-06, Vol.208, p.237-241
• Main Authors: Tang, Zhaohui, Wang, Zhixing, Li, Xinhai, Peng, Wenjie
• Format: Article
• Language: English
• Subjects: Applied sciences; Cathode; Cycle performance; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Lithium-ion batteries; Materials; Rate capability
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2012.02.085

► Pure phase can be obtained when Li-excessive value x keeps between 0.045 and 0.18. ► The initial efficiency (Q1d/Q1c) keeps the same low-level of 70% for different samples. ► Li1.045Mn0.509Ni0.223Co0.223O2 sample (x=0.045) expresses highest initial discharge capacity of 259.8mAhg−1. ► The Li-excessive value x of 0.09 sample exhibits the best rate capability in 100mAg−1 and 200mAg−1. ► Almost no reduction is observed after 24-time cycles in all for Li1.09Mn0.486Ni0.212Co0.212O2 sample. Li-rich Mn-based Li1+x(Mn0.533Ni0.233Co0.233)1−xO2 (x=0, 0.045, 0.09, 0.135, 0.18, 0.225) materials have been prepared by a conventional solid-state reaction. XRD, SEM and half-cell tests are investigated on the influence of Li content. Pure phase can be obtained when Li-excessive value x keeps between 0.045 and 0.18. The initial efficiency (Q1d/Q1c) almost keeps the same level of 70% for different Li-excessive samples. Li1.045Mn0.509Ni0.223Co0.223O2 sample shows highest discharge capacity of 259.8mAhg−1. Li1.09Mn0.486Ni0.212Co0.212O2 sample exhibits the best rate capability, and almost no reduction is observed after 24-time cycles in different discharge current density.