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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 34, Number 2
BKCSDE 34(2)
February 20, 2013 

Roles of Fluorine-doping in Enhancing Initial Cycle Efficiency and SEI Formation of Li-, Al-cosubstituted Spinel Battery Cathodes
Cao Cuong Nguyen, Young-San Bae, Kyung-Ho Lee, Jin-Woo Song, Jeong-Hye Min, Jong-Seon Kim, Hyun-Seok Ko, Younkee Paik, Seung-Wan Song*
Spinel cathode, Fluorine-doping, Interfacial reactivity, SEI formation, Lithium-ion batteries
Fluorine-doping on the Li1+xMn1.9-xAl0.1O4 spinel cathode materials is found to alter crystal shape, and enhance initial interfacial reactivity and solid electrolyte interphase (SEI) formation, leading to improved initial coulombic efficiency in the voltage region of 3.3-4.3 V vs. Li/Li+ in the room temperature electrolyte of 1 M LiPF6/EC:EMC. SEM imaging reveals that the facetting on higher surface energy plane of (101) is additionally developed at the edges of an octahedron that is predominantly grown with the most thermodynamically stable (111) plane, which enhances interfacial reactivity. Fluorine-doping also increases the amount of interfacially reactive Mn3+ on both bulk and surface for charge neutrality. Enhanced interfacial reactivity by fluorine-doping attributes instant formation of a stable SEI layer and improved initial cyclic efficiency. The data contribute to a basic understanding of the impacts of composition on material properties and cycling behavior of spinelbased cathode materials for lithium-ion batteries.
384 - 388
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