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소듐 이온전지용 주석 음극의 안정화를 위한 PVdF 옥세틱 구조의 영향 KCI 등재

Effect of Auxetic Structure of PVdF on Tin Anode Stability for Na-ion Batteries

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한국분말야금학회지 (Journal of Korean Powder Metallurgy Institute)
한국분말재료학회(구 한국분말야금학회) (Korean Powder Metallurgy Institute)
초록

This study investigates the viability of using a Na-ion battery with a tin(Sn) anode to mitigate the vulnerability caused by volume changes during discharge and charge cycling. In general, the volume changes of carbon material do not cause any instability during intercalation into its layer structure. Sn has a high theoretical capacity of 847 mAh g−1. However, it expands dramatically in the discharge process by alloying Na-Sn, placing the electrode under massive internal stress, and particularly straining the binder over the elastic limit. The repeating strain results in loss of active material and its electric contact, as well as capacity decrease. This paper expands the scope of fabrication of Na-ion batteries with Sn by fabricating the binder as an auxetic structure with a unique feature: a negative Poisson ratio (NPR), which increases the resistance to internal stress in the Na-Sn alloying/de-alloying processes. Electrochemical tests and micrograph images of auxetic and common binders are used to compare dimensional and structural differences. Results show that the capacity of an auxetic-structured Sn electrode is much larger than that of a Sn electrode with a common-structured binder. Furthermore, using an auxetic structured Sn electrode, stability in discharge and charge cycling is obtained.

목차
Abstract
 1. Introduction
 2. Experimental
 3. Results and Discussion
 4. Conclusions
 References
저자
  • 박진수(경운대학교 항공신소재공학과) | Jinsoo Park (Department of Advanced Aerospace Materials Engineering, Kyungwoon University) Corresponding Author