Design of phosphorus-doped porous hard carbon/Si anode with enhanced Li-ion kinetics for high-energy and high-power Li-ion batteries

被引:48
作者
Yi, Si [1 ]
Yan, Zhilin [1 ]
Li, Xingda [1 ]
Wang, Zhen [2 ]
Ning, Pengpeng [2 ]
Zhang, Jingwen [3 ]
Huang, Jinlan [3 ]
Yang, Deren [1 ]
Du, Ning [1 ]
机构
[1] Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon & Adv Semicond Mat, Hangzhou 310027, Peoples R China
[2] New Mat Technol Co Ltd, Huzhou 313000, Peoples R China
[3] Shenzhen Yanyi New Mat Co Ltd, Shenzhen 518110, Peoples R China
基金
中国国家自然科学基金;
关键词
Porous; Si/hard carbon composite; Electrochemical kinetics; Anode; Lithium-ion battery; LITHIUM-ION; HIGH-PERFORMANCE; SILICON; ELECTRODES; COMPOSITE; STORAGE;
D O I
10.1016/j.cej.2023.145161
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
With the rapid progress of portable electronics and electric vehicles, high-energy lithium-ion batteries (LIBs) with fast-charging technology are urgently required. Silicon (Si) is considered as the most promising anode candidate for high-energy LIBs but challenging to large-scale commercialization due to its huge volume change and poor conductivity. To develop high-capacity Si-based anode materials with enhanced lithium-ion diffusion and fast reaction kinetics, we design a novel high-Si-content Si/hard carbon composite via scalable methods. The com-bination between phosphorus-doped hard carbon with porous structure and uniformly distributed Si nanolayers effectively improve lithium-ion kinetics and mitigate the volume change of Si. As a result, the architecture de-livers a reversible capacity of 1124 mAh/g at 0.1C and superior cycling stability with an 87.4% capacity retention after 200 cycles at 1C. The 1.5 A h pouch-type full-cell tests further demonstrate good cycling stability and high rate performance at 4C under an electrode density of 1.6 g cm-3 and areal capacity loading of 3.53 mAh cm-2. This work paves a new way for the rational design of Si-based anode materials for high-energy and high-power LIBs.
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页数:11
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