文献类型：期刊文献

英文题名：Hierarchical micro-mesoporous Si[sbnd]C anodes reinforced by CO2-converted carbon nanotubes for high-energy lithium-ion batteries

作者：Liang, Han[1]; Wei, Yunan[1]; Wang, Rui[1]; Fang, Biao[1]; Mo, Runwei[1,2]

机构：[1] School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Shanghai Key Laboratory of Intelligent Sensing and Detection Technology, East China University of Science and Technology, Shanghai, 200237, China

年份：2025

卷号：134

外文期刊名：Journal of Energy Storage

收录：EI(收录号：20253419007009)

语种：英文

外文关键词：Anodes - Carbon silicon carbide composites - Coatings - Mesoporous materials - Silicon batteries - Silicon compounds - Stability - Storage (materials) - Yarn

摘要：Micro-sized silicon anodes offer excellent lithium storage capacity for lithium-ion batteries, which has attracted extensive research. However, their substantial volume expansion and inherently low electrical conductivity severely limit their practical application. There is a challenge to develop an environmentally friendly and scalable approach to synthesize micro-sized Si/C composites that combine high areal capacity, excellent rate capability, and outstanding cycling performance. Here, we developed a novel strategy to synthesize micro-sized hierarchical micro-mesoporous silicon?carbon/carbon nanotubes (μpSi-C@CNTs) composites using CO2 as a carbon source. Such composites possess outstanding electronic and ionic conductivity, electrochemical and structural stability, which can serve as an industrial-standard anodes with high areal capacity (e.g., 6.8 mA h cm?2 or 2119.6 mA h g?1), good rate capability (e.g., 2.9 mA h cm?2 or 905.8 mA h g?1 at 12.8 mA cm?2), and outstanding cycling performance (e.g., a decay of only 0.038 % per cycle at 6.4 mA cm?2), which exceeds previously reported. The excellent structural stability of μpSi-C@CNTs electrode during lithiation was observed through in situ optical microscopy. Interestingly, finite element simulations revealed that CNT wrapping and carbon coating could alleviate the huge volume change of μpSi. The practical potential application of μpSi-C@CNTs is evaluated by full cell tests with a NCM811 cathode. This work offers an effective route for conversion of CO2 into high value-added energy storage materials for a broad range of applications. ? 2025 Elsevier Ltd