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An analysis of F-doping in li-rich cathodes

Rare Metals 2022年第6期41卷 1771-1796页

作者： Trent Seaby Tong-En lin Yu-Xiang Hu Qing-Hong Yuan lian-Zhou Wang Nanomaterials Centre School of Chemical Engineering and Australian Instiutle for Bioengineering and Nanotec hnologyThe University of QucenslandBrisbane QLD 4072Australia Key Laboratory of Advanced Functional materials Education Ministry of China.Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124 China Centrefor Theoretical and Computational MolecularScience Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbane QLD 4072Australia

li-rich materials,due to their high capacity(>250 mAh·g^(-1)),have recently been considered as an alternative to the current generation of cathode materials for li-ion batteries(liBs).However,their inferior cycling stability limits their practical *** is a common technique to solve this ***,anion doping remains relatively ***(F)is one of the most effective anion dopants owning to the improved capacity,cycling stability,and rate performance in *** explanations and experimental results,however,vary significantly from study to ***,we find that bulk F-doping significantly improves both rate performance and cycling stability,likely driven by charge compensation and greater ***,bulk F-doping occasionally improves capacity via enhanced activation and occasionally decreases capacity by preventing activation from *** F-doping has similar effects to bulk F-doping on capacity and stability,while significantly hindering the rate ***,the improvements in surface-doped materials do not appear to be a result of specific surface modification,and instead can be ascribed to the effect of fluorine on the near-surface bulk *** understanding of fluo-rine's influence on activation,in particular,is required to unlock the full potential of synergistic cation/anion co-doping.

关键词： li-rich materials Fluorine dopingi Normalization analysis Electrochemical performance

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