Lee, Hae Ri Kim, Yun Sik Lee, Seon Yeong Son, U. Hyeok Lee, Sungho Joh, Han-Ik 2024-06-20T05:00:04Z 2024-06-20T05:00:04Z 2024-06-20 2024-08 0169-4332 https://pubs.kist.re.kr/handle/201004/150097 Cobalt disulfide (CoS 2 ) stands as a promising candidate for anode materials in lithium -ion batteries due to its high theoretical capacity, but it faces challenges associated with the shuttle effect of lithium polysulfide during cycling. To address these issues, zeolitic imidazolate framework (ZIF)-derived composites have been extensively explored because of distinct advantages such as the formation of nano -sized particles, heteroatom doping, and highly porous structures. However, ZIF-derived carbon supports primarily consist of ultra-micropores that can impede lithium -ion diffusion. Herein, we aimed to enhance cycling stability by introducing a nitrogen -doped carbon quantum dot (NCQD) solution derived from N-methyl-2-pyrrolidone into cobalt -based ZIF-67 to modify the porosity and dope heteroatoms of CoS 2 nanoparticle-embedded heteroatom-doped carbon composites (CoS 2 /NSC). The mildly acidic NCQD solution resulted in the partial etching of the ZIF-67 structure, along with the deposition of NCQDs as a nitrogen source. Notably, the pore sizes could be adjusted by varying the concentration of the NCQD solution, while retaining the nitrogen functional groups during carbonization. The electrode using CoS 2 /NSC with the 2.8 mL NCQD pre-treatment exhibited enhanced C -rate capability with the capacity of 392 mAh/g at 2.0 A/g. Moreover, the cycling stability was improved, with a capacity retention of 77 % after 100 cycles. English Elsevier BV Bifunctional effects of nitrogen-doped carbon quantum dots on CoS2/mesoporous carbon composites for high-performance lithium-ion batteries Article 10.1016/j.apsusc.2024.160228 1 Applied Surface Science, v.664 Applied Surface Science 664 N scie scopus 001240945800001 2-s2.0-85192555984 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article METAL-ORGANIC-FRAMEWORKS ELECTROCHEMICAL PERFORMANCE FACILE SYNTHESIS ENERGY-STORAGE ANODE MATERIAL GRAPHENE SULFUR ELECTROCATALYSTS NANOPARTICLES ELECTRODE Nitrogen -doped quantum dot Co -based ZIF-67 Mesoporous carbon CoS 2 / carbon composite Anode material Li -ion battery