Integrated Surface Functionalization of Li-Rich Cathode Materials for Li-Ion Batteries

• DOI: 10.1021/acsami.8b16319
• Publication Date: 2018-11-07T11:07:03Z
• Authors: Dandan Wang; Tinghua Xu; Yaping Li; Du Pan; Xia Lu; Yong-Sheng Hu; Sheng Dai; Ying Bai
• Keywords: Surface Modification; Fluorine; Surface layer

As candidates for high-energy density cathodes, lithium-rich (Li-rich) layered materials have attracted wide interest next-generation Li-ion batteries. In this work, surface functionalization of a typical Li-rich material Li1.2Mn0.56Ni0.17Co0.07O2 is optimized by fluorine (F)-doped Li2SnO3 coating layer and electrochemical performances are also enhanced accordingly. The results demonstrate that F-doped Li2SnO3-modified exhibits the highest capacity retention (73% after 200 cycles), with approximately 1.2, 1.4, 1.5 times discharge surface-modified, F-doped, pristine electrodes, respectively. To reveal fundamental enhancement mechanism, intensive Li+ diffusion kinetics, postmortem structural characteristics, aging tests performed four sample systems. show integrated plays an important role in addressing interface compatibility, not only limited stabilizing bulk structure suppressing side reactions, synergistically contributing to performance active electrodes. These findings pave way commercial application but shed new light on modification batteries other energy storage fields.