Coral-like porous composite material of silicon and carbon synthesized by using diatomite as self-template and precursor with a good performance as anode of lithium-ions battery
Coral-like porous composite material of silicon and carbon synthesized by using diatomite as self-template and precursor with a good performance as anode of lithium-ions battery
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以硅藻土为自模板剂和前驱体合成的珊瑚状多孔硅碳复合材料具有良好的锂离子电池负极性能
DOI：
10.1016/j.jallcom.2020.157253
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发表时间：
2021-02-15
影响因子：
6.2
通讯作者：
An, Baigang
中科院分区：
文献类型：
--
作者：
Di, Fang;Wang, Ning;An, Baigang
尽管硅的Li+存储理论容量高达4200 mAh g(-1)，但锂离子电池(LIB)硅基负极的开发却受到锂化和脱锂巨大的体积变化以及相应的高昂成本的严重阻碍。本研究以低成本的天然硅藻土为前驱体和自模板来生产硅并构建多孔结构，通过添加氯化钠的镁热还原反应（MRR）技术和乙炔CVD方法成功合成了珊瑚状多孔硅/碳（CLP-Si/C）材料。 CLP-Si/C中的大孔/中孔的分级结构继承自硅藻土本身，是通过去除硅藻土中未反应的SiO2和MRR副产物MgO而产生的。乙炔CVD进一步构建了碳层和Si颗粒的壳核结构。分级孔和核壳结构使CLP-Si/C作为LIB负极表现出稳定的循环性能，在250 mA g(-1)倍率下循环100次后仍能保持990.6 mAh g(-1)的容量。该工作为以硅藻土为前驱体和模板剂制备高性能多孔Si/C负极材料提供了一种简单、低成本、可规模化的策略，在锂离子电池硅基负极材料的实际应用开发中具有广阔的前景。 (C) 2020 Elsevier B.V. 保留所有权利。
Developing silicon based anode of lithium-ion battery (LIB) is seriously blocked by the huge volume change of lithiation and delithiation and the corresponded high cost paying to solve it, although Si with the theoretical capacity of 4200 mAh g(-1) for Li+ storage. In this study, natural diatomite with low cost was using as precursor and self-template to produce Si and construct porous structure, a coral-like porous Si/C (CLP-Si/C) material has been successfully synthesized through the NaCl added magnesiothermic reduction reaction (MRR) technology and acetylene CVD method. The hierarchical structure of macro-/mesopores in CLP-Si/C are inherited from diatomite itself and produced by removing the unreacted SiO2 in diatomite and the byproduct of MgO of MRR. Acetylene CVD further constructs a shellcore structure of carbon layers and Si particles. The hierarchical pores and core-shell structure make CLP-Si/C exhibit a stable cycling performance as LIB anode that the capacity of 990.6 mAh g(-1) can be kept after 100 cycles at a rate of 250 mA g(-1). This work provides a simple, low-cost and scalable strategy for producing porous Si/C anode materials with high-performance by using diatomite as both precursor and template, and is promising in the development of practical application of Si based anode materials of lithium-ion battery. (C) 2020 Elsevier B.V. All rights reserved.