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J. Y. Lee(이지연),H. C. Shim(심형철),S. M. Hyun(현승민),M. S. Oh(오민섭),S.-J. Jeon(전성재),S. H. Jeong(정수환) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
As the electric-vehicle market grows, the massive efforts have been tried to develop materials with high capacity and high power for lithium ion secondary batteries. Sn-based anode materials are highly promising due to high theoretical specific capacity (994 mAh/g) as well as high power density for its excellent electrical conductivity. However, the use of Sn has been limited by the delamination from the current collector and degradation in structural stability due to the large volumetric change of ~257% during lithiation and delithiation process. To solve this problem, many studies have been attempted to alleviate volume expansion by inserting Sn particles into a soft carbon matrix, but it has been considered difficult to mass-produce due to the complicated manufacturing process. In this work, graphene/Sn composite material was prepared by a laser processing followed by RF magnetron sputtering. Porous graphene structure was rapidly fabricated using a laser irradiation, and Sn layer was deposited on the graphene by sputtering. This simple and fast manufacturing techniques helps to produce graphene/Sn composites without complicated process, and can also be easily adaptable to mass production. The resulting graphene/Sn composite-based anode exhibited a high capacity of 430 mAh/g at 2C and stable cyclability over 700 cycles at