Ni-induced stepwise capacity increase in Ni-poor Li-rich cathode materials for high performance lithium ion batteries
Ni-induced stepwise capacity increase in Ni-poor Li-rich cathode materials for high performance lithium ion batteries作者机构：Nanomaterials Centre School of Chemical Engineering and Australian Institute of Bioengineering and Nanotechnology The University of Queensland Brisbane QLD 4072 Australia School of Chemistry Monash University Clayton Victoria 3800 Australia National Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan Centre for Microscopy and Microanalysis and Material Engineering The University of Queensland Brisbane QLD 4072 Australia
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2015年第8卷第3期
页 面：808-820页
核心收录：
基 金：support from Chinese Scholarship Council (CSC) authors are grateful to ARC through its LP and DP programs
主 题：Ni-doping capacity-increase Li-rich cathode materials lithium ion battery
摘 要：Li-rich cathode materials have been considered as promising candidates for high-energy lithium ion batteries （LIBs）. In this study, we report a new series of Li-rich materials （Li[Li1/B-2x/BMn2/3-x/3Nix]O2 （0.09 ≤x≤ 0.2）） doped with small amounts of Ni as cathode materials in LIBs, which exhibited unusual phenomenon of capacity increase up to tens of cycles due to the continuous activation of the Li2MnO3 phase. Both experimental and computational results indicate that unlike commonly studied Ni-doped Li-rich cathode materials, smaller amounts of Ni doping can promote the stepwise Li2MnO3 activation to obtain increased specific capacity and better cycling capability. In contrast, excessive Ni will over-activate the Li2MnO3 and result in a large capacity loss in the first cycle. The Lil.25Mn0.625Ni0.12sO2 material with an optimized content of Ni delivered a superior high capacity of -280 mAh.g-1 and good cycling stability at room temperature.
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