리튬이차전지용 Si/Cu/Graphite 복합체 음극의 전기화학적 거동
Electrochemical Behavior of Si/Cu/Graphite Composite Anode for Lithium Secondary Battery
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초록
탄소 피복된 Si/Cu 분말을 기계적인 볼-밀링(ball-milling) 방법과 고온에서 탄화수소가스 분해 방법에 의해 제조하여 리튬이차전지용 음극으로 사용하였고 이에 대한 전기화학적 거동을 조사하 였다. 천연흑연(natural graphite)을 이용하여 탄소 피복된 Si/Cu/graphite 복합체 음극소재를 제조하 였으며 천연흑연 음극소재와 전기화학적 특성을 비교하였다. 탄소 피복된 Si/Cu 음극의 가역적 비용량은 초기 10 싸이클까지 지속적인 증가를 나타냈다. 탄소 피복된 Si/Cu/graphite 복합체 음극의 가역적 비용량은 0.25mA/cm2 전류밀도에서 450mAh/g이고 초기 싸이클 효율은 81.3%로 나타났다. 복합체 음극의 싸이클 성능은 가역적인 비용량값을 제외하고 천연흑연 음극과 유사하게 나타났다.
Abstract
The carbon-coated Si/Cu powders were synthesized by mechanical ball- milling and hydrocarbon gas decomposition methods at high temperature. The carbon-coated Si/Cu powder was used as anode for lithium secondary battery and its electrochemical behavior was investigated. In addition, the carbon-coated Si/Cu/graphite composite anode material was prepared using natural graphite powder and their electrochemical characteristics were compared with natural graphite anode. The specific capacity of carbon-coated Si/Cu anode increased to the initial 10 cycles. The carbon-coated Si/Cu/graphite composite anode exhibited the reversible specific capacity of 450mAh/ g and the first cycle efficiency of 81.3% at 0.25mA/cm2. The cycling performance of the composite anode was similar to that of pure graphite anode except the reversible specific capacity value.
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