Roles of Fluorine-doping in Enhancing Initial Cycle Efficiency and SEI Formation of Li-, Al-cosubstituted Spinel Battery Cathodes 


Vol. 34,  No. 2, pp. 384-388, Feb.  2013
10.5012/bkcs.2013.34.2.384


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  Abstract

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.

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  Cite this article

[IEEE Style]

C. C. Nguyen, Y. Bae, K. Lee, J. Song, J. Min, J. Kim, H. Ko, Y. Paik, S. Song, "Roles of Fluorine-doping in Enhancing Initial Cycle Efficiency and SEI Formation of Li-, Al-cosubstituted Spinel Battery Cathodes," Bulletin of the Korean Chemical Society, vol. 34, no. 2, pp. 384-388, 2013. DOI: 10.5012/bkcs.2013.34.2.384.

[ACM Style]

Cao Cuong Nguyen, Young-San Bae, Kyung-Ho Lee, Jin-Woo Song, Jeong-Hye Min, Jong-Seon Kim, Hyun-Seok Ko, Younkee Paik, and Seung-Wan Song. 2013. Roles of Fluorine-doping in Enhancing Initial Cycle Efficiency and SEI Formation of Li-, Al-cosubstituted Spinel Battery Cathodes. Bulletin of the Korean Chemical Society, 34, 2, (2013), 384-388. DOI: 10.5012/bkcs.2013.34.2.384.

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ISSN(Print) 0253-2964
ISSN(Online) 1229-5949