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Electrochemical Characteristics of a Si/Ge Multilayer Anode for Lithium-Ion Batteries
Myung-Hoon Kim,박종완,Jorge A Ascencio,Seung-Ho Ahn 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
A Si/Ge multilayer consisting of a active/active material was prepared using rf/dc magnetron sputtering. Ge is expected to act as a buffer against the volume change of the silicon and to enhance the cyclabilty. The structural and the electrochemical characteristics of the multilayers were investigated. The multilayer maintained greater than 65 % of its initial capacity (2090 mAhg.1) after 100 cycles whereas the initial capacity of the Si thin film was gradually degraded after 10 cycles.
리튬 이온 전지용 Si/Mo 다층박막 음극의 전기화학적 특성
박종완,Park, Jong-Wan,Ascencio Jorge A. 한국재료학회 2006 한국재료학회지 Vol.16 No.5
Si/Mo multilayer anode consisting of active/inactive material was prepared using rf/dc magnetron sputtering. Molybdenum acts as a buffer against the volume change of the Silicon. Multilayer deposited on RT (reversible treatment) copper foil current collector to enhance adhesion between Silicon and copper foil. Deposited Silicon was identified as an amorphous. Amorphous has a relatively open structure than crystal structure, thus prevents the lattice expansion and has many diffusion paths of Li ion. When deposited time of Silicon and Molybdenum is 30 second and 2 second respectably, electrode has more capacity and good cycle stability. A 3000 nm thick multilayer was maintained 99% of the initial capacity (1624 $mAhg^{-1}$) after 100 cycles. As the increase of the multilayer thickness (4500 nm, 6000 nm), Si/Mo mutilayer anodes show aggravation cycle stability.