title: AlF3 surface-coated Li[Li0.2 Ni0.17 Co0.07 Mn0.56 ]O2 nanoparticles with superior electrochemical performance for lithium-ion batteries.
abstract: Li-rich layered cathode materials have already drawn considerable attention owing to their high capacity performance for Li-ion batteries (LIBs). In this work, layered Li-rich Li[Li0.2 Ni0.17 Co0.07 Mn0.56 ]O2 nanoparticles are surface-modified with AlF3 through a facile chemical deposition method. The AlF3 surface layers have little impact on the structure of the material and act as buffers to prevent the direct contact of the electrode with the electrolyte; thus, they enhance the electrochemical performance significantly. The 3 wt % AlF3 -coated Li-rich electrode exhibits the best cycling capability and has a considerably enhanced capacity retention of 83.1 % after 50 cycles. Moreover, the rate performance and thermal stability of the 3 wt % AlF3 -coated electrode are also clearly improved. Surface analysis indicates that the AlF3 coating layer can largely suppress the undesirable growth of solid electrolyte interphase (SEI) film and, therefore, stabilizes the structure upon cycling.
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics & Electronics, Henan University, Kaifeng 475004 (PR China).
authors.forename: Shuwei
authors.initials: S
authors.lastname: Sun
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics & Electronics, Henan University, Kaifeng 475004 (PR China).
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Yin
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics & Electronics, Henan University, Kaifeng 475004 (PR China).
authors.forename: Ning
authors.initials: N
authors.lastname: Wan
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics & Electronics, Henan University, Kaifeng 475004 (PR China).
authors.forename: Qing
authors.initials: Q
authors.lastname: Wu
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics & Electronics, Henan University, Kaifeng 475004 (PR China).
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics & Electronics, Henan University, Kaifeng 475004 (PR China).
authors.forename: Du
authors.initials: D
authors.lastname: Pan
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics & Electronics, Henan University, Kaifeng 475004 (PR China). ybai@henu.edu.cn.|Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (USA). ybai@henu.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Bai
authors.affiliation: Materials Engineering, McGill University, Montréal, Québec H3A 0C5 (Canada). xia.lu@mail.mcgill.ca.
authors.forename: Xia
authors.initials: X
authors.lastname: Lu
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry; D011211:Electric Power Supplies; D004563:Electrochemistry; D004566:Electrodes; D005459:Fluorides / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D010087:Oxides / Q000737:chemistry
chemical_list: D017607:Aluminum Compounds; D010087:Oxides; D003035:Cobalt; D008345:Manganese; D009532:Nickel; D008094:Lithium; D005459:Fluorides; C032311:aluminum fluoride
keywords: batteries; fluorides; nanoparticles; sol-gel processes; surface analysis