Cho, Moon Kyu You, Seung Jae Woo, Jung Gyu An, Jung-Chul Kang, Sujin Lee, Hyun-Wook Kim, Ji Hoon Yang, Cheol-Min Kim, Yong Jung 2024-01-19T14:31:26Z 2024-01-19T14:31:26Z 2021-09-05 2021-06-15 1359-8368 https://pubs.kist.re.kr/handle/201004/116856 Si-based Li-ion battery (LIB) anode materials often possess porous structures to accommodate the intrinsic volumetric expansion of Si upon cycling. However, the porous structure may cause poor initial coulombic efficiency (ICE), inadequate cycle life due to the continuous generation of a solid-electrolyte interface, and incompatibility with calendaring processes. To overcome these issues, we designed an optimized Si/C (P?Si/C) composite anode consisting of Si nanoparticles, graphite, and pitch, with a highly densified structure, suppressing Si expansion and enabling compatibility with the calendaring process. To further enhance the cycle life, the surface of the P?Si/C composite was modified by chemical vapor deposition using CH4 gas (C?Si/C). The P?Si/C anode exhibited a high ICE of 88.0% with a rapid surge up to 99.0% after only the 4th cycle. The C?Si/C anode presented an improved capacity retention of 49.5% after the 39th cycle, compared with 46.0% for the P?Si/C anode after the 31st cycle, while maintaining the same ICE. Moreover, anodes prepared with 8 wt% P?Si/ C or C?Si/C and 92 wt% graphite (m-P-Si/C and m-C-Si/C, respectively) showed higher capacity retentions compared with pure Si/C anodes. The m-C-Si/C anode exhibited a higher capacity retention of 80.1% after the 40th cycle, compared with 71.2% for the m-P-Si/C anode. The m-C-Si/C anode also displayed an extremely low expansion rate and the majority of the expansion was elastically recovered. This C?Si/C composite provided a controllable means to modify the performance of LIBs by simple mixing with graphite. English ELSEVIER SCI LTD HIGH-CAPACITY HIGH-POWER LITHIUM SILICON GRAPHITE PERFORMANCE ELECTRODES PARTICLES STABILITY OXIDE Anomalous Si-based composite anode design by densification and coating strategies for practical applications in Li-ion batteries Article 10.1016/j.compositesb.2021.108799 1 COMPOSITES PART B-ENGINEERING, v.215 COMPOSITES PART B-ENGINEERING 215 scie scopus 000647783600004 2-s2.0-85104935533 Engineering, Multidisciplinary Materials Science, Composites Engineering Materials Science Article HIGH-CAPACITY HIGH-POWER LITHIUM SILICON GRAPHITE PERFORMANCE ELECTRODES PARTICLES STABILITY OXIDE Silicon-based anode Highly densified anode CVD coating Binder pitch Li-ion battery