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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 The Study on the Cyclability of Cobalt Oxide with Copper Nanowire as Anode for Lithium-Ion Batteries

2012년 2월 16일 16시 44분 12초
ELEC.P-1288 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
하성민, 김원배
광주과학기술원 신소재공학부, Korea
Conversion-type active materials of transition metal oxides have been considered as attractive materials for Li-ion batteries due to larger capacity relatively. But the materials have major drawbacks such as large irreversible capacity and low energy efficiency. Many researchers have been studied to overcome these drawbacks through introducing nanostructured active materials and additives. In this work, we propose a novel structure of nanostructured conducting additive in active material for LIBs and investigate how change performance with nanostructure and the loading amount of active materials via sputtering. We introduce directly grown copper nanowires which have an average of ca. 80nm diameter and 3㎛ length on copper substrate vertically and densely via indirect vapor phase method and reduction. Co3O4 as active materials which have the theoretical capacity of 890mAh/g is sputtered on them with various mass to confirm the loading amount effect. Co3O4/copper nanowires composites improve at least 25% compared with ordinary cobalt oxide anode after 50 cycles through the discharge-charge analysis with the amount of 0.470mg approximately. Such enhanced property may be associated with nanoscale-modified electrode that has large surface area and strong facile stress stability. These advancements could be affected by increased reaction sites, faster charge transport, decreased electrochemical double-layer capacitance, and easy stress relaxation. Also, as the amount change of active materials, we expect they may effects on the kinetics of cell reaction. Because active materials deposited with the film morphology via sputtering, their actual contact area with conducting additives and electrolyte related with electron and lithium-ion conduction change with respect to loading amount. Therefore, Lower amount of them may increase their kinetics. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 20110016600 (Mid-career Researcher Program)), by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. R15-2008-006-03002-0), and by the Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation under the Ministry of Education, Science and Technology, Korea. (0420-20110157)