Woo, Jae-Young Kim, A. -Young Kim, Min Kyu Lee, Sang-Hyup Sun, Yang-Kook Liu, Guicheng Lee, Joong Kee 2024-01-20T01:34:10Z 2024-01-20T01:34:10Z 2021-09-01 2017-04-15 0925-8388 https://pubs.kist.re.kr/handle/201004/122847 To provide a possible proposal for the large-scale production of a high performance silicon-based anode material in the lithium battery industry, a Cu3Si nanoparticle doped porous-silicon particles was prepared via a simplified chemical vapor deposition (CVD) process and heat treatment for the first time. In this work, the Cu3Si doping content was optimized by discharge/charge, transmission electron microscopy and electrochemical impedance spectroscopy tests. The results show that compared with the porous-silicon (PS) particles, the Cu3Si doping significantly enhanced the discharge capacity, coulombic efficiency, capacity retention, and high-rate performance of the silicon-based anode. The optimum performance with a discharge capacity of 3036.4 mA h g(-1) and a coulombic efficiency of 90.49% at the first cycle (after the first three formation cycles) and a capacity retention of 58.72% after 100 cycles occurred at a Cu3Si doping content of 2 wt%. The reasons for this are as follows: the PS particles with a similarly silicon nanorod structure accommodated the volume change to maintain the mechanical stability of the electrode during the cycling process; during the simplified CVD process, the nanostructure of silicon was retained; the high conductivity due to Cu3Si doping decreased the formation resistance of the solid-electrolyte interphase (SEI) film and enhanced the diffusion coefficient of Li+ inside the silicon based material; both fewer Cu3Si doping and aggregation particles resulting from excessive Cu3Si doping yielded insufficient electrical conductivity and decreased the formation resistance of the SEI film for the silicon-based material. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA X-RAY-DIFFRACTION RADICAL OXIDATION THIN-FILMS PERFORMANCE LI COMPOSITE CAPACITY CATHODE MICRO STABILITY Cu3Si-doped porous-silicon particles prepared by simplified chemical vapor deposition method as anode material for high-rate and long cycle lithium-ion batteries Article 10.1016/j.jallcom.2017.01.137 1 JOURNAL OF ALLOYS AND COMPOUNDS, v.701, pp.425 - 432 JOURNAL OF ALLOYS AND COMPOUNDS 701 425 432 scie scopus 000395839100054 2-s2.0-85010281727 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article X-RAY-DIFFRACTION RADICAL OXIDATION THIN-FILMS PERFORMANCE LI COMPOSITE CAPACITY CATHODE MICRO STABILITY Cu3Si doping Porous silicon particles Simplified CVD method Lithium-ion batteries Anode material