Critical role of surface craters for improving the reversibility of Li metal storage in porous carbon frameworks. (October 2021)

• Record Type: Journal Article
• Authors: Choi, Seung Hyun; Hyeon, Yuhwan; Shin, Hong Rim; Eom, Gwang Hyeon; Thi Thu Pham, Hien; Whang, Dongmok; Kim, So Yeun; Lee, Jong-Won; Kim, Jung Ho; Park, Min-Sik
• Is Part Of: Nano energy. Volume 88(2021)
• Publication Date: 2021-10
• Subjects: Lithium metal batteries -- Porous host materials -- Mesopores -- Coulombic efficiency -- Mass transport; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2021.106243
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Recently, a certain type of porous carbon framework (PCF) based on zeolitic imidazolate frameworks (ZIFs) has been proposed as a promising anode material for metallic Li storage owing to its controllable pore structure and functionality. With the purpose of improving the Li storage capability and reversibility, meso-scale surface craters (SCs) are strategically introduced on the outermost surface of the PCF via hard templating with colloidal SiO2 nanoparticles. Combined structural and electrochemical investigations demonstrate the critical role of SCs in improving the reversibility of PCF in repeated Li plating and stripping. The SCs on the PCF surface provide facile pathways for the transport of Li ions through the electrode, promote Li plating in the internal pores, and serve as meso-scale sites for metallic Li storage. Furthermore, an SC-integrated PCF anode has shown improved rate capability and cycling performance in a full-cell configured with a commercial cathode, when compared to the conventional PCF anode. This work could offer practical guidelines for the development of robust Li storage materials for advanced Li-metal batteries. Graphical Abstract: ga1 Highlights: Introducing surface craters (SCs) on porous carbon framework (PCF) is effective to develop a highly reliable anode for Li-metal batteries. The SC integration can improve the utilization of internal pores of PCF as well as lower the overpotentials. The SCs could facilitate Li-ion transport in the electrode, allowing a stable operation even at high current densities. The SC-PCF-full cell exhibits the noticeable rate capability and cycling performance compared to the pristine PCF-full cell.