Flores-López Samantha L, Lobato Belén, Rey-Raap Natalia, Cameán Ignacio, García Ana B, Arenillas Ana
Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco Pintado Fe, 26, 33011 Oviedo, Spain.
Nanomaterials (Basel). 2023 Jan 23;13(3):458. doi: 10.3390/nano13030458.
In recent years, the research on lithium-ion batteries (LIBs) to improve their lifetime, efficiency and energy density has led to the use of silicon-based materials as a promising anode alternative to graphite. Specifically, crystalline silicon (Si) and silicon carbide (SiC) obtained from deposition or reduction processes (e.g., magnesiothermal reduction) stand out for their electrochemical properties. However, the synthesis routes proposed until now have limitations that make them difficult to afford or operate on a large scale. For this reason, in this work, carbon-silicon (C-Si) hybrid materials synthesized through an efficient route are evaluated as the potential precursor for the obtention of both Si and SiC species in a single material. The feasibility and influence of the magnesiothermal reduction process were evaluated, and materials with 10 wt.% of reduced Si and 10-26 wt.% of SiC were obtained. Both species play a role in the improvement of the performance of silicon-based materials as anodes in lithium-ion batteries. In comparison with materials obtained by the reduction of silica gels and composites, the reduced C-Si hybrid gels stand out thanks to the homogeneous distribution and stability of the species developed.
近年来，为提高锂离子电池（LIBs）的寿命、效率和能量密度而开展的研究促使人们使用硅基材料作为石墨阳极的一种有前景的替代材料。具体而言，通过沉积或还原工艺（如镁热还原）获得的晶体硅（Si）和碳化硅（SiC）因其电化学性能而备受关注。然而，迄今为止提出的合成路线存在局限性，使其难以大规模经济地实现或操作。因此，在本工作中，通过高效路线合成的碳硅（C-Si）杂化材料被评估为在单一材料中同时获得Si和SiC物种的潜在前驱体。评估了镁热还原过程的可行性和影响，获得了含10 wt.%还原Si和10 - 26 wt.% SiC的材料。这两种物种在改善硅基材料作为锂离子电池阳极的性能方面都发挥了作用。与通过硅胶还原和复合材料获得的材料相比，还原后的C-Si杂化凝胶由于所形成物种的均匀分布和稳定性而表现突出。
