Preparation and characterization of silicon-based three-dimensional cellular anode for lithium ion battery
Preparation and characterization of silicon-based three-dimensional cellular anode for lithium ion battery
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DOI：
10.1016/j.elecom.2006.11.031
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发表时间：
2007-05
影响因子：
5.4
通讯作者：
T. Jiang;Shichao Zhang;X. Qiu;Wentao Zhu;Liquan Chen
中科院分区：
文献类型：
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作者：
T. Jiang;Shichao Zhang;X. Qiu;Wentao Zhu;Liquan Chen
通过将磨碎的硅粉浇注到“谷脊”铜结构中制备了三维多孔硅基负极，然后通过充放电（C-D）测试、循环伏安法（CV）和电化学阻抗谱（EIS）研究了其电化学性能和失效机制。与通过“浆料涂覆”技术在平面铜箔上制备的普通2D阳极相比，3D铜框架在限制硅颗粒剧烈体积变化方面表现出巨大的结构优势。这种“应力缓解”作用可以有效阻止充放电过程中电极内部发生的应变引起的松动，从而提高硅基负极的循环寿命和库伦效率。
A three-dimensional cellular silicon-based anode was prepared by casting milled silicon powders into the “valley-ridge” copper architecture, then its electrochemical property and failure mechanism were studied by means of charging–discharging (C–D) test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). In comparison with common 2D anode fabricated by “slurry-coating” technology on flat copper foil, the 3D copper framework has shown a great structure advantage in restricting severe volume changes of silicon particles. This “stress-alleviated” action can effectively impede strain-induced loosening happened inside electrodes during charging and discharging, and consequently improve cycle-life and coulombic efficiency of silicon-based anode.