材料科学
碳纤维
锂(药物)
微观结构
阳极
复合数
无定形固体
原材料
无定形碳
复合材料
化学工程
电极
化学
有机化学
物理化学
工程类
医学
内分泌学
作者
Xiao Xue,Bin Lou,Chongchong Wu,Weiwei Pang,Jichang Zhang,Nan Si,Zhuowu Men,Fusheng Wen,Xiujie Yang,Jian Wu,Lingyan Tian,Dong Liu
标识
DOI:10.1016/j.cej.2024.150936
摘要
Due to the demand for high mass loading in industrial application, micron-sized Si/C composites are preferred compared to nanoparticles. Utilizing Al-Si alloy as the raw material, an ant's nest-like porous Si/C composite material was successfully constructed through carbon coating and acid etching techniques, leading to an improvement in the cyclic stability of micron-sized Si/C composites under high mass loading. Furthermore, notable observations were made regarding the influence of carbon material type on the independent charge–discharge behavior of Si within the Si/C composite material, especially during the plateau region of Si-Li conversion processes. In-situ XRD test revealed transitions of Si between crystalline and amorphous states in the Si/C composite material during charge and discharge processes. Additionally, in Si/C composite materials fabricated using hard carbon, the increased lithium-ion transport rate attributed to the highly disordered structure of hard carbon promotes the acquisition of charges during delithiation process. As a result, this decelerates the lithium de-alloying process in Si-Li alloys, leading to an improved conversion depth of amorphous Si-Li alloys and a reduction in electrode capacity decay. This study provides valuable insights into Si conversion processes within Si/C composite materials and offers rational strategies for future material optimization.
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