The impact of carbon material microstructure on li-ion storage behaviors of Si in Si/C anodes

被引:8
作者
Xue, Xin [1 ]
Lou, Bin [1 ]
Wu, Chongchong [2 ]
Pang, Weiwei [3 ]
Zhang, Jichang [1 ]
Shi, Nan [1 ]
Men, Zhuowu [4 ]
Wen, Fushan [1 ]
Yang, Xiujie [1 ]
Wu, Jing [5 ]
Tian, Lingyan [1 ]
Liu, Dong [1 ]
机构
[1] China Univ Petr, State Key Lab Heavy Oil Proc, Qingdao 266580, Shandong, Peoples R China
[2] CNOOC Inst Chem & Adv Mat, Beijing 102200, Peoples R China
[3] PetroChina Co Ltd, Petrochem Res Inst, Beijing 102266, Peoples R China
[4] Natl Inst Clean and Low Carbon Energy, Beijing 102211, Peoples R China
[5] PetroChina Liaohe Petrochem Co, Panjin 124000, Liaoning, Peoples R China
基金
中国国家自然科学基金;
关键词
Si/C composite materials; Ant's nest; in-situ XRD; Si-Li alloys; SILICON; COMPOSITE; PERFORMANCE; DESIGN; NANOPARTICLES; ELECTRODES; STABILITY; FRACTURE; PITCH;
D O I
10.1016/j.cej.2024.150936
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
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.
引用
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页数:11
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