School of Materials and Energy , University of Electronic Science and Technology of China , Chengdu 610054 , China.
University of Chinese Academy of Sciences , Beijing 100049 , China.
ACS Appl Mater Interfaces. 2018 Jun 13;10(23):19639-19648. doi: 10.1021/acsami.8b03000. Epub 2018 Jun 1.
Owing to its high specific capacity, silicon is considered as a promising anode material for lithium ion batteries (LIBs). However, the synthesis strategies for previous silicon-based anode materials with a delicate hierarchical structure are complicated or hazardous. Here, Prussian blue analogues (PBAs), widely used in ink, are deposited on the silicon nanoparticle surface (PBAs@Si-450) to modify silicon nanoparticles with transition metal atoms and a N-doped carbon layer. A facile and green synthesis procedure of PBAs@Si-450 nanocomposites was carried out in a coprecipitation process, combined with a thermal treatment process at 450 °C. As-prepared PBAs@Si-450 delivers a reversible charge capacity of 725.02 mAh g at 0.42 A g after 200 cycles. Moreover, this PBAs@Si-450 composite exhibits an exceptional rate performance of ∼1203 and 263 mAh g at current densities of 0.42 and 14 A g, respectively, and fully recovered to 1136 mAh g with the current density returning to 0.42 A g. Such a novel architecture of PBAs@Si-450 via a facile fabrication process represents a promising candidate with a high-performance silicon-based anode for LIBs.
由于其高比容量，硅被认为是锂离子电池（LIBs）有前途的阳极材料。然而，以前具有精细分级结构的硅基阳极材料的合成策略复杂或有危险。在这里，普鲁士蓝类似物（PBA），广泛用于油墨，被沉积在硅纳米颗粒表面（PBA@Si-450）上，以用过渡金属原子和 N 掺杂的碳层修饰硅纳米颗粒。通过共沉淀工艺，结合 450°C 的热处理工艺，进行了 PBA@Si-450 纳米复合材料的简便绿色合成。所制备的 PBA@Si-450 在 200 次循环后以 0.42 A g 的电流密度可提供 725.02 mAh g 的可逆充电容量。此外，该 PBA@Si-450 复合材料在 0.42 和 14 A g 的电流密度下分别表现出出色的倍率性能，约为 1203 和 263 mAh g，并且当电流密度回到 0.42 A g 时完全恢复到 1136 mAh g。通过简便的制造工艺实现的 PBA@Si-450 这种新颖架构代表了一种有前途的高性能硅基 LIBs 阳极候选材料。
