Li[Li0.2Mn0.54Ni0.13Co0.13]O2—MoO3 composite cathodes with low irreversible capacity loss for lithium ion batteries

• Published in: Journal of power sources Vol. 247; pp. 20 - 25
• Main Authors: Wu, Feng, Wang, Zhao, Su, Yuefeng, Yan, Na, Bao, Liying, Chen, Shi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 01-02-2014
• Subjects: Activation; Applied sciences; Ball milling; Cathodes; Cycles; Direct energy conversion and energy accumulation; Discharge; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Insertion; Lithium-ion batteries; Materials; Stability; Lithium ion batteries; Lithium-ion battery; Cobalt Oxides; Cathode; Nickel Oxides; Lithium Oxides; Irreversible process; Lithium; Molybdenum oxide; Secondary cell; Electrode material; Compositing; Deterioration; Composite electrode; Manganese Oxides; Lithium-rich; Molybdenum Oxides; Irreversible; Cathode materials; Irreversible capacity loss; Modified material
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2013.08.031

To reduce the large first-cycle irreversible capacity loss of the Li-rich layered cathode material Li[Li0.2Mn0.54Ni0.13Co0.13]O2, MoO3 has been introduced by a simple high-energy ball milling process. The electrochemical properties of cathode material Li[Li0.2Mn0.54Ni0.13Co0.13]O2 and the influences of different MoO3 amount on its electrochemical properties are discussed in detail. The first charge-discharge dQ/dV curves suggest that the MoO3 component provides additional sites for lithium ion insertion to compensate the lost Li sites caused by the simultaneous removal of Li+ and O2- during the activation of Li[Li0.2Mn0.54Ni0.13Co0.13]O2. With increasing MoO3 content from 0 wt.% to 20 wt.%, the first-cycle irreversible capacity loss of the composite decreases from 81.8 mAh g-1 to 1.2 mAh g-1. The composite with 5 wt.% MoO3 exhibits a good cycling stability with the discharge capacity of 242.5 mAh g-1 after 50 cycles, and the thickness of the MoO3 coating layer on the surface of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 is about 3-4 nm. However, with the increase of the addition content of MoO3, the cycling stability of the Li[Li0.2Mn0.54Ni0.13Co0.13]O2-MoO3 composite is decreased.