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114th General Meeting of Korean Chemical Society FeF3/Reduced Graphene Oxide Microsphere Composites Synthesized Through Hydrothermal-Assisted Method as a Cathode Material for Lithium-Ion Batteries

Submission Date :
8 / 28 / 2014 , 14 : 07 : 48
Abstract Number :
Presenting Type:
Poster Presentation
Presenting Area :
Authors :
제지운, 김종식*
동아대학교 화학과, Korea
Assigned Code :
ELEC.P-1229 Assigend Code Guideline
Presenting Time :
10월 15일 (수요일) 16:00~19:00
In recent decades, rechargeable lithium-ion batteries (LIBs) are one of the most commonly used energy storage systems. The rapid growth of various electric devices market has been demanding LIBs with enlarged reversible capacities. FeF3 is considered as an alternative cathode material for commercialized LiCoO2, because FeF3 has the high theoretical capacities of about 237 and 712 mAh·g-1 in the voltage range of 2.0-4.5 V and 1.5-4.5 V, respectively. However, FeF3 has disadvantage of its low electrical conductivity exhibiting poor capacity retention and rate performance. In this study, we successfully synthesize FeF3/reduced graphene oxide (r-GO) microsphere composites through a vapor-solid (VS) process. r-GO is used as a conductive agent to improve electrical conductivity of FeF3. The size of FeF3/r-GO microsphere composites is also controlled by varying the amount of r-GO which is 1.7 and 11 wt%. The prepared FeF3/r-GO microsphere composites are characterized by XRD, FT-IR, EA, SEM, and TEM. FeF3/r-GO11 exhibits an initial discharge capacity of about 174 mAh·g-1 in the voltage range of 2.0-4.5 V at 0.1 C rate (1 C = 237 mA·g-1) with a capacity retention of about 86.2 % after 50 cycles. In the wide voltage range of 1.5-4.5 V, FeF3/r-GO11 also shows improved cycling performances compared to bare FeF3, delivering the initial discharge capacity over 410 mAh·g-1 at 0.1 C rate.