Long-term cycling stability of a SnS-based covalent organic nanosheet anode for lithium-ion batteries

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 11; no. 25; pp. 1332 - 1333
• Main Authors: Jang, Jeong-Hun, Lee, Minseop, Park, Soohyeon, Oh, Jae-Min, Park, Jin Kuen, Paek, Seung-Min
• Format: Journal Article
• Published: 27.06.2023
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d3ta01537h

Various SnS 2 -based carbonaceous anodes for lithium ion battery (LIB) systems have been developed to enhance the electrochemical performance of SnS 2 materials and to overcome the disadvantages of transition metal sulfides with less interfacial surface sites and low electrochemical conductivity. In this study, we introduced a new strategy of hybridization of SnS 2 and covalent organic nanosheets (CONs) that have high flexibility, high stability in organic electrolytes, and many interfacial surface sites. The CON provided reaction sites for the growth of SnS 2 nanoparticles due to the strong electrostatic interaction between the sulfur heteroatoms of CONs and Sn 4+ , resulting in the formation of ultrathin SnS 2 nanoplates on the CON nanosheets. The resulting SnS 2 -based CON showed outstanding cyclic stability over 5600 charge/discharge cycles at a current density of 1.0 A g −1 in the LIB system. In particular, the prominent interfacial surface sites of CONs provided large accessible areas for lithium ions, showing stable successive cycling performances with improved electrical and ionic conductivities. A CON are hybridized with layered SnS 2 to improve electrical conductivity and structural stability of SnS 2 for lithium ion battery systems. Therefore, the hybrid shows outstanding performances over 5600 charge/discharge cycles.