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http://dx.doi.org/10.5229/JKES.2013.16.3.162

Improved Cycle Life and Storage Performance in High-Voltage Operated Li2MnO3-LiMO2(M=Ni, Co, Mn)/Graphite Cell System by Fluorine Compounds as Main Electrolyte Solvent  

Yu, Jung-Yi (Central Research Division, Samsung SDI)
Shin, Woocheol (Central Research Division, Samsung SDI)
Lee, Byong-Gon (Central Research Division, Samsung SDI)
Publication Information
Journal of the Korean Electrochemical Society / v.16, no.3, 2013 , pp. 162-168 More about this Journal
Abstract
$Li_2MnO_3-LiMO_2$(M=Ni, Co, Mn) nano-composite is a promising cathode material for xEV application due to its high theoretic capacity. However high voltage operating system of $Li_2MnO_3-LiMO_2$(M=Ni, Co, Mn) has worked as a hurdle in its application because of the inherent demerits, such as cycle life degradation and gas evolution. In order to enhance cell performance of $Li_2MnO_3-LiMO_2$(M=Ni, Co, Mn)/graphite cell, we examined electrolyte mainly composed of FEC, fluroalkyl ether and $LiPF_6$ (F-based EL). F-based EL showed much better discharging retention ratio than 1.3 M $LiPF_6$ EC/EMC/DMC (3/4/3, v/v/v) (STD). Furthermore gas evolution, especially CO and $CO_2$ during $60^{\circ}C$ storage for 30 days was dramatically reduced owing to thermal stable SEI formation effect of F-based EL.
Keywords
Lithium ion battery; $Li_2MnO_3-LiMO_2$ nano-composite; Electrolyte; FEC; Fluoroalkyl ether;
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