실리콘과 구리 실리사이드가 코팅된 흑연의 리튬 이차전지 음극으로서의 전기화학적 특성 Electrochemical characteristics of silicon and copper silicide-coated graphite for the anode materials of lithium secondary batteries원문보기
The common anode material of commercial lithium secondary battery is graphite because of excellent cycle stability compared with other anode materials such as metal(Sn, Sb, Al, Si etc). However maximum capacity of synthetic graphite is limited to 372mAh/g and reversible capacity of graphite is betwe...
The common anode material of commercial lithium secondary battery is graphite because of excellent cycle stability compared with other anode materials such as metal(Sn, Sb, Al, Si etc). However maximum capacity of synthetic graphite is limited to 372mAh/g and reversible capacity of graphite is between 280 and 310mAh/g . In order to increase the reversible capacity of the lithium ion batteries, silicon have been studied as an anode materials of lithium ion batteries. The employment of silicon as anode material of lithium ion batteries, however, still hindered because of two problems. One is poor cyclability due to large volume changes during repeated intercalation/de-intercalation reaction and the other is the low electrical conductivity of silicon. Failures of silicon as anode material of lithium secondary batteries are consequently related to the poor electrical conductivity and drastic volume change. The application and investigation of copper silicide have been increasing interest due to its good behaviors in electronic and electrochemical properties . For the preparation of copper silicide coating on the graphite particles, there are many coating techniques currently in use, for example, vacuum evaporation, reactive evaporation, chemical vapor deposition, sputtering and so on. The previous works have been reported that metal silicide alloys, consisting of active (silicon) and metal elements (copper, nickel) are promising as anodes for lithium ion batteries. Silicide has been attractive in the field of lithium batteries as an anode compared to other anode materials. In this study, the electrochemical behavior of copper silicide coating graphite electrode is examined by comparing the silicon coating graphite and bare graphite. The silicon coated graphite exhibited an initial discharge capacity of 350mAh/g with 69% coulomb efficiency at C/5 rate, but discharge capacity sharply decreases and then 50% of initial capacity was lost after 30 cycles due to large volume change during repeated cycles. However, initial discharge capacity of copper silicide coated graphite is increased to 440mAh/g with higher coulomb efficiency and exhibits better capacity retention of 88% of initial discharge capacity after 30 cycles, which is attributed to the decrease in interfacial resistance. It suggests that the existence of copper silicide film on the graphite surface plays an important role as an active material of the electrode not only mitigates volume change but also reduces interfacial resistance.
The common anode material of commercial lithium secondary battery is graphite because of excellent cycle stability compared with other anode materials such as metal(Sn, Sb, Al, Si etc). However maximum capacity of synthetic graphite is limited to 372mAh/g and reversible capacity of graphite is between 280 and 310mAh/g . In order to increase the reversible capacity of the lithium ion batteries, silicon have been studied as an anode materials of lithium ion batteries. The employment of silicon as anode material of lithium ion batteries, however, still hindered because of two problems. One is poor cyclability due to large volume changes during repeated intercalation/de-intercalation reaction and the other is the low electrical conductivity of silicon. Failures of silicon as anode material of lithium secondary batteries are consequently related to the poor electrical conductivity and drastic volume change. The application and investigation of copper silicide have been increasing interest due to its good behaviors in electronic and electrochemical properties . For the preparation of copper silicide coating on the graphite particles, there are many coating techniques currently in use, for example, vacuum evaporation, reactive evaporation, chemical vapor deposition, sputtering and so on. The previous works have been reported that metal silicide alloys, consisting of active (silicon) and metal elements (copper, nickel) are promising as anodes for lithium ion batteries. Silicide has been attractive in the field of lithium batteries as an anode compared to other anode materials. In this study, the electrochemical behavior of copper silicide coating graphite electrode is examined by comparing the silicon coating graphite and bare graphite. The silicon coated graphite exhibited an initial discharge capacity of 350mAh/g with 69% coulomb efficiency at C/5 rate, but discharge capacity sharply decreases and then 50% of initial capacity was lost after 30 cycles due to large volume change during repeated cycles. However, initial discharge capacity of copper silicide coated graphite is increased to 440mAh/g with higher coulomb efficiency and exhibits better capacity retention of 88% of initial discharge capacity after 30 cycles, which is attributed to the decrease in interfacial resistance. It suggests that the existence of copper silicide film on the graphite surface plays an important role as an active material of the electrode not only mitigates volume change but also reduces interfacial resistance.
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