| 학회 | 한국재료학회 |
| 학술대회 | 2018년 봄 (05/16 ~ 05/18, 삼척 쏠비치 호텔&리조트) |
| 권호 | 24권 1호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Electrochemical Performance and Preparation of rGO@LiFePO4 composite by Microwave-assisted Hydrothermal Synthesis for a Li-ion battery cathode |
| 초록 | The present lithium-ion batteries have been limited in large-scale applications comprising electric vehicles and energy storage system. Especially, the importance of battery safety has been focused because of the various issues including explosion of smart devices. The lithium iron phosphate (LiFePO4) based cathode has been studied due to the advantage of being very stable against heat. In addition, there is little structural change in the crystal phase during charge and discharge process, leading to a long life-cycle. However, it has a low electrical conductivity and low operating voltage compared to other cathode materials. To overcome these drawbacks, various studies have been conducted including carbon coating and conductive polymer doping. In this study, a microwave-assisted hydrothermal synthesis method was proposed to combine LiFePO4 particles with reduced graphene oxide (rGO) at a relatively low temperature in a short time with a one-step process. First, a complex of GO sheets and precursor, NH4FePO4 particles was prepared by co-precipitation. Through the subsequent hydrothermal reaction, the rGO@LiFePO4 composite was finally synthesized. The finally prepared rGO@LiFePO4 composite were characterized by XRD and FE-SEM. The electrochemical behavior of the fabricated electrodes have been investigated by galvanostatic charge-discharge. As a result, the initial specific discharge capacity of rGO@LiFePO4 electrode was 140 mAh/g, which is much greater than that of pristine LiFePO4 (80 mAh/g) prepared without rGO by the same method. |
| 저자 | 신지아, 이주연, 최성호, 강영구, 안기석, 정하균 |
| 소속 | 한국화학(연) |
| 키워드 | <P>lithium iron phosphate; reduced graphene oxide; microwave-assisted hydrothermal synthesis</P> |
