3D silicon/graphite composite electrodes for high-energy lithium-ion batteries

被引：65
|
作者：
Zheng, Y. [1 ,2 ]
Seifert, H. J. [1 ]
Shi, H. [3 ]
Zhang, Y. [3 ]
Kuebel, C. [2 ]
Pfleging, W. [1 ,2 ]
机构：
[1] Karlsruhe Inst Technol, IAM AWP, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
[2] Karlsruhe Nano Micro Facil, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
[3] Beijing Univ Technol, IMPAM, Beijing, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2019年 / 317卷
基金：
中国国家自然科学基金;
关键词：
Lithium-ion battery; Silicon anode; Graphite anode; High rate capability; Ultrafast laser processing; ANODE MATERIAL; SILICON NANOPARTICLES; LI; PERFORMANCE; SPECTROSCOPY; LITHIATION; FRAMEWORK; SIZE; FILM;
D O I：
10.1016/j.electacta.2019.05.064
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Graphite composite electrodes mixed with silicon are proposed as next generation anode material for high energy and high power applications. In order to overcome drawbacks caused by volume changes of silicon particles during electrochemical cycling and to maintain high specific capacities at enhanced Crates, free-standing structures are generated on silicon/graphite electrodes by applying ultrafast laser ablation. Electrochemical properties are systematically investigated by means of galvanostatic measurements, cyclic voltammetry, and electrochemical impedance spectroscopy. Cells with structured electrodes exhibit improved battery performances and lithium-ion transport kinetics in comparison to cells with unstructured electrodes. Furthermore, the cells with structured electrodes exhibit a lower impedance at fully lithiated state. After cycling, post-mortem analysis is performed revealing that the mechanical stress within the electrodes and current collector can be significantly reduced due to laser generated free-standing structures. (c) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码：502 / 508
页数：7
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