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Mingzheng Ge
Mingzheng Ge is a professor at the School of Textile and Clothing, Nantong University. He received his PhD degree from the College of Textile and Clothing Engineering at Soochow University in 2018. During 2016-2017, he was an exchange student at NTU (Singapore). He was a postdoctoral researcher at the Institute of Applied Physics and Materials Engineering at the University of Macau from 2020 to 2022. He has been selected as “World Top 2% Scientists 2023”, and have published more than 60 papers (Total Citations>7500, H-index=38) in the professional journals of material science and engineering, such as Chem. Soc. Rev., Adv. Mater., Angew. Chem. Int. Ed., Adv. Funct. Mater., ACS Nano, etc., including 13 ESI highly cited papers. His research interests focus on bioinspired materials with special wettability and advanced materials for energy storage devices.
Presentation title: Interface Engineering and Structure Design of High-capacity Electrode Materials for High Energy Density Lithium Ion Batteries
Abstract: Lithium-ion batteries (LIBs) have been widely used as grid-level energy storage systems to power electric vehicles, hybrid electric vehicles, and portable electronic devices. However, it is a big challenge to develop high-capacity electrode materials with large energy storage and ultrafast charging capability simultaneously due to the sluggish charge carrier transport in bulk materials and fragments of active materials. To address this issue, composite electrodes of SnO2 nanodots and Sn nanoclusters embedded in hollow porous carbon nanofibers (denoted as SnO2@HPCNFs and Sn@HPCNFs) were respectively constructed programmatically for customized LIBs. Highly interconnected carbon nanofiber networks served as fast electron transport pathways. Additionally, the hierarchical hollow and porous structure facilitated rapid Li-ion diffusion and alleviated the volume expansion of Sn and SnO2. SnO2@HPCNFs delivered a remarkably high capacity of 899.3 mA h g-1 at 0.1 A g-1 due to enhanced Li adsorption and high ionic diffusivity. Meanwhile, Sn@HPCNFs displayed fast charging capability and superior high rate performance of 238.8 mA h g-1 at 5 A g-1 (∼10 C) due to the synergetic effect of enhanced Li-ion storage in the bulk pores of Sn and improved electronic conductivity. a mechanically reinforced localized structure is designed for carbon-coated Si nanoparticles (C@Si) via elongated TiO2 nanotubes networks toward stabilizing Si electrode via alleviating mechanical strain and stabilizing the SEI layer. Benefited from the rational localized structure design, the carbon-coated Si nanoparticles/TiO2 nanotubes composited electrode (C@Si/TiNT) exhibits an ideal electrode thickness swelling, which is lower than 1% after the first cycle and increases to about 6.6% even after 1600 cycles. While for traditional C@Si/carbon nanotube composited electrode, the initial swelling ratio is about 16.7% and reaches ≈190% after 1600 cycles. As a result, the C@Si/TiNT electrode exhibits an outstanding capacity of 1510 mAh g-1 at 0.1 A g-1 with high rate capability and long-time cycling performance with 95% capacity retention after 1600 cycles. The rational design on mechanically reinforced localized structure for silicon electrode will provide a versatile platform to solve the current bottlenecks for other alloyed-type electrode materials with large volume expansion toward practical applications.