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  • 09월 10일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Highly Elastic Polyrotaxane Binders for Mechanically Stable Lithium Hosts in Lithium‐Metal Batteries

2019년 8월 21일 14시 16분 13초
ELEC.P-407 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
저자 및
Dong-Joo Yoo, Jang Wook Choi*
School of Chemical and Biological Engineering, Seoul National University, Korea
In an attempt to overcome the longstanding hurdles of lithium metal anodes with unparalleled specific capacities, conductive scaffolds that can take up lithium have been lately investigated with great attention. Carbon nanotubes (CNTs) are ideal units to constitute such scaffolds because their one-dimensional nanostructures can efficiently percolate a conductive network while plating lithium through their internal pores. However, CNT networks are liable to rupture upon lithium deposition due to the generation of substantial stress. Here, we report CNT scaffolds with enhanced mechanical properties by incorporating molecular pulley binder containing a small amount of polyrotaxane (5%) cross-linked to the conventional polyacrylic acid binder. The pulley binder links functionalized CNTs via hydrogen bonds, sustaining the mechanical integrity of the expanding CNT network at a current density of up to 6 mA cm‒2 and even with an areal capacity of up to 6 Ah g‒1cnt. The polyrotaxane in the pulley binder imparts elasticity to the CNT network originating from the ring sliding motion. The improved mechanical stability of the CNT network induces lithium to be uniformly plated/stripped into/from the network pores during repeated cycles. As a result, the molecular pulley binder-incorporated CNT network exhibits considerably improved cyclability in lithium-copper asymmetric cells and full-cells paired with olivine-LiFePO4, compared to the binder-free and non-elastic binder counterpart. This investigation reveals that the integration of elastic binders in conductive lithium-uptake scaffolds can be an important step forward in realizing high performance lithium metal batteries.