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논문 기본 정보

자료유형
학술저널
저자정보
Choi, Sung Il (Department of Chemical Engineering, Pukyong National University) Lee, Ye Min (Department of Chemical Engineering, Pukyong National University) Jeong, Hui Cheol (Department of Chemical Engineering, Pukyong National University) Jung, Eun-Jin (Metallic Materials Research Group, Research Institute of Industrial Science & Technology) Lee, Mi Sun (Metallic Materials Research Group, Research Institute of Industrial Science & Technology) Kim, Jinyoung (Metallic Materials Research Group, Research Institute of Industrial Science & Technology) Kim, Yong Ha (Department of Chemical Engineering, Pukyong National University) Won, Yong Sun (Department of Chemical Engineering, Pukyong National University)
저널정보
한국화학공학회 화학공학 화학공학 제56권 제1호
발행연도
2018.1
수록면
139 - 142 (4page)

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초록· 키워드

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Silicon (Si) is a promising anode material for next-generation lithium ion batteries (LIBs) because of its high capacity of 4,200 mAh/g ($Li_{4.4}Si$ phase). However, the large volume expansion of Si during lithiation leads to electrical failure of electrode and rapid capacity decrease. Generally, a binder is homogeneously mixed with active materials to maintain electrical contact, so that Si needs a particular binding system due to its large volume expansion. Polyvinyl alcohol (PVA) is known to form a hydrogen bond with partially hydrolyzed silicon oxide layer on Si nanoparticles. However, the decrease of its cohesiveness followed by the repeated volume change of Si still remains unsolved. To overcome this problem, we have introduced the electrospinning method to weave active materials in a stable nanofibrous PVA structure, where stresses from the large volume change of Si can be contained. We have confirmed that the capacity retention of Si-based LIBs using electrospun PVA matrix is higher compared to the conservative method (only dissolving in the slurry); the $25^{th}$ cycle capacity retention ratio based on the $2^{nd}$ cycle was 37% for the electrode with electrospun PVA matrix, compared to 27% and 8% for the electrodes with PVdF and PVA binders.

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