Macroporous Directed and Interconnected Carbon Architectures Endow Amorphous Silicon Nanodots as Low‑Strain and Fast‑Charging Anode for Lithium‑Ion Batteries  

作　　者：Zhenwei Li Meisheng Han Peilun Yu Junsheng Lin Jie Yu 

机构地区：[1]Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems,Shenzhen Engineering Lab for Supercapacitor Materials,School of Material Science and Engineering,Harbin Institute of Technology,Shenzhen,University Town,Shenzhen 518055,People’s Republic of China [2]Songshan Lake Materials Laboratory Dongguan,Dongguan 523808,Guangdong,People’s Republic of China [3]Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第5期333-351,共19页纳微快报（英文版）

基　　金：All authors acknowledge fund support from Guangdong Basic and Applied Basic Research Foundation(2020A1515110762);National Natural Science Foundation of China(52172084).

摘　　要：Fabricating low-strain and fast-charging silicon-carbon composite anodes is highly desired but remains a huge challenge for lithium-ion batteries.Herein,we report a unique silicon-carbon composite fabricated by uniformly dis-persing amorphous Si nanodots(SiNDs)in carbon nanospheres(SiNDs/C)that are welded on the wall of the macroporous carbon framework(MPCF)by vertical graphene(VG),labeled as MPCF@VG@SiNDs/C.The high dispersity and amor-phous features of ultrasmall SiNDs(~0.7 nm),the flexible and directed electron/Li+transport channels of VG,and the MPCF impart the MPCF@VG@SiNDs/C more lithium storage sites,rapid Li+transport path,and unique low-strain property during Li+storage.Consequently,the MPCF@VG@SiNDs/C exhibits high cycle stability(1301.4 mAh g^(-1) at 1 A g^(-1) after 1000 cycles without apparent decay)and high rate capacity(910.3 mAh g^(-1),20 A g^(-1))in half cells based on industrial electrode standards.The assembled pouch full cell delivers a high energy density(1694.0 Wh L^(-1);602.8 Wh kg^(-1))and an excellent fast-charging capability(498.5 Wh kg^(-1),charging for 16.8 min at 3 C).This study opens new possibilities for preparing advanced silicon-carbon com-posite anodes for practical applications.

关 键 词：Amorphous Si nanodots Low-strain Fast-charging Lithium-ion batteries 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]