Sb2O3-modified LiNi1/3Co1/3Mn1/3O2 material with enhanced thermal safety and electrochemical property

• Published in: Journal of power sources Vol. 254; pp. 106 - 111
• Main Authors: Han, Zenghui, Yu, Jinpeng, Zhan, Hui, Liu, Xingjiang, Zhou, Yunhong
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.05.2014; Elsevier
• Subjects: Antimony oxide; 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; Layered material; Lithium ion battery; Thermal safety; Lithium ion battery; Electrochemical performance; Layered material; Antimony oxide; Thermal safety; Lithium ion batteries; Nickel Manganites; Cobalt Oxides; Nickel Oxides; Cobalt Manganites; Lithium Oxides; Secondary cell; Antimony Oxides; Electrochemical characteristic; Multi-element compound; Electrochemical properties; Thermal protection; Manganese Oxides; Lithium Manganites; Electrical characteristic
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2013.11.126

The layered LiMO2 (M = Ni, Co and Mn) materials LiNi1/3Co1/3Mn1/3O2 and LiNi0.4Co0.2Mn0.4O2 are synthesized by rheological phase method. Sb2O3-modified phases are further obtained by mechanical ball milling treatment. The structure and morphology of the bare and modified samples are characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Charge/discharge tests indicate that the modified phases all improve cycling stability, rate capability and thermal safety. Careful comparison of the charge/discharge profiles reveals that the serious polarization increment in cycling is suppressed in the Sb2O3-modified LiMO2 electrodes. AC impedance shows that Sb2O3/LiNi1/3Co1/3Mn1/3O2 electrode has smaller Rct and Rf value. Further analysis proves that Sb2O3 hinders the reaction between electrolyte and cathode during charge/discharge process and helps to stabilize the SEI. Other experiments prove that using Sb2O3-coated separator can achieve similar positive effect on layered LiMO2 cathode. •Sb2O3/LiMO2 was obtained by rheological phase method and ball milling post-treatment.•Sb2O3/LiMO2 has enhanced cycling stability, rate capability, and thermal safety.•Sb2O3/LiMO2 electrodes have maintained good kinetic property and improved interface.•Sb2O3-coated separator maybe has similar positive effect as Sb2O3/LiMO2.