Key Laboratory of Colloid and Interface Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P.R. China.
Key Laboratory of Liquid-Solid Structural Evolution &, Processing of Materials, School of Materials Science and Engineering, Shandong University, Jinan, 250061, P.R. China.
Chemistry. 2020 Aug 17;26(46):10544-10549. doi: 10.1002/chem.202000953. Epub 2020 Jul 20.
Synthesis of silicon/carbon (Si/C) composites from biomass resources could enable the effective utilization of agricultural products in the battery industry with economical as well as environmental benefits. Herein, a simplified process was developed to synthesize Si/C from biomass, by using a low-cost agricultural byproduct "rice husk (RH)" as a model. This process includes the calcination of RH for SiO /C and the reduction of SiO /C by Al in molten salts at a moderate temperature. This process does not need the removal of carbon before thermal reduction of SiO , which is thought to be necessary to avoid the formation of SiC at elevated temperatures. Thus, carbon derived from biomass can be directly used for Si/C composites for anode materials. The resultant Si/C shows a high reversible capacity of 1309 mAh g and long cycle life (300 cycles). This research advocates a new and simplified strategy for the synthesis of RH-based biomass-derived Si/C, which is beneficial for low-cost, environmentally friendly, and green energy storage applications.
从生物质资源中合成硅/碳 (Si/C) 复合材料，可以使电池行业有效利用农产品，具有经济和环境效益。在此，开发了一种简化的工艺，以低成本的农业副产品“稻壳 (RH)”为模型，从生物质中合成 Si/C。该工艺包括 RH 的煅烧以获得 SiO /C，以及在中温下通过 Al 在熔盐中还原 SiO /C。该工艺不需要在热还原 SiO 之前去除碳，据认为这是避免在高温下形成 SiC 所必需的。因此，生物质衍生的碳可以直接用于 Si/C 复合材料作为阳极材料。所得的 Si/C 表现出 1309 mAh g 的高可逆容量和长循环寿命 (300 次循环)。这项研究倡导了一种新的简化策略，用于合成基于 RH 的生物质衍生 Si/C，这有利于低成本、环保和绿色储能应用。
