Tran, Minh Xuan Woo, Jae-Young Thuy-An Nguyen Lee, Sang-Wha Lee, Joong Kee 2024-01-19T16:33:52Z 2024-01-19T16:33:52Z 2021-09-02 2020-09-01 1385-8947 https://pubs.kist.re.kr/handle/201004/118145 The most critical bottleneck of Si anode materials is an inevitable cracking and pulverization of Si nanostructure during electrochemical cycling process, resulting in a significant loss of electrical contact and rapid capacity fading. The low-temperature thermolytic grafting process at 360-400 degrees C was employed to produce a conformal carbon coating on a bundle-like porous silicon (por-Si) prepared by silver-assisted chemical etching. During the thermolytic grafting process, polystyrene infiltrated in the por-Si was depolymerized into styrenic carbon fragments rich of phenyl moieties. The styrenic carbon fragments were subsequently grafted uniformly on the por-Si surface as an ultrathin carbonaceous film of 5 nm, which was confirmed by transmission electronic microscope, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy. The polystyrene grafted por-Si (por-Si@PS) was employed as a lithium-storage anode material. After 100 cycles at a current rate of 0.5C, the por-Si@PS anode exhibited an excellent reversible capacity of 1938.82 mAh g(-1), when compared to those of por-Si and pristine Si anodes with 1228.57 mAh g(-1) and 117.43 mAh g(-1). The por-Si@PS exhibited a good recovery capability of 93.1% in the C-rate test. The ultrathin carbonaceous coating rich of phenyl moieties not only prevents the rapid pulverization of nanostructured Si, but also enhances the interfacial properties of por-Si@PS as lithium-storage anode material. Notably, the thermolytically grafted Si-C species rich of phenyl moieties played as a strong adhesive passivation layer against the corrosive electrochemical agents during cycling. English ELSEVIER SCIENCE SA ELECTROCHEMICAL PERFORMANCE FACILE SYNTHESIS GRAPHENE SHEETS COMPOSITE ANODE ION BATTERIES SI ANODES SHELL SURFACE NANOPARTICLES DESIGN Thermolytically grafted silicon particles with ultrathin carbonaceous coating rich of phenyl moieties as lithium-storage anode material Article 10.1016/j.cej.2020.125169 1 CHEMICAL ENGINEERING JOURNAL, v.395 CHEMICAL ENGINEERING JOURNAL 395 scie scopus 000537152400006 2-s2.0-85083875310 Engineering, Environmental Engineering, Chemical Engineering Article ELECTROCHEMICAL PERFORMANCE FACILE SYNTHESIS GRAPHENE SHEETS COMPOSITE ANODE ION BATTERIES SI ANODES SHELL SURFACE NANOPARTICLES DESIGN Bundle-like porous Si Low temperature thermolytic grafting Ultrathin carbonaceous film Phenyl moieties