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电化学  2014 

酸浸蚀Al-Si合金制备锂离子电池高性能多孔硅负极材料

DOI: 10.13208/j.electrochem.130426, PP. 1-4

Keywords: 锂离子电池,多孔硅,硅电极,铝硅合金,氟化碳酸乙烯酯

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Abstract:

本文首次提出利用酸浸蚀Si-Al(含Al80%)合金粉末的方法制备多孔硅材料.分析表明制得的多孔硅材料为晶体,并具有由纳米颗粒结集成的海绵状多孔结构,其粒径约20μm,比表面102.7m2·g-1.多孔硅电极按多孔硅:导电碳:粘结剂=1:1:1(bymass)涂成.在添加15%氟化碳酸乙烯酯(FEC)的1mol·L-1LiPF6/EC+DMC(1:1,byvolume)电解液,在100mA·g-1电流密度充放电,多孔硅电极的首次放电比容量2072mAh·g-1Si.经237次充放电循环后,其放电容量仍可保持在1431mAh·g-1Si,显示了相当高的充放电稳定性.这归因于其海绵状多孔结构有足够的微空间以承受充电过程中硅的急剧膨胀.硅微粒的纳米尺寸有利于锂在Li-Si合金中的扩散.纳米硅微粒可牢固地联成一整体,不易因膨胀、收缩而粉化断裂.这种构筑多孔硅负极材料的新方法操作简便、成本低廉,有着很好的应用前景.

References

[1]  Kim H, Seo M, Park M, et al. A critical size of silicon nano-anodes for lithium rechargeable batteries[J]. Angewandte Chemie International Edition, 2010, 49(12): 2146-2149.
[2]  Hu L, Wu H, Hong S S, et al. Si nanoparticle-decorated Si nanowire networks for Li-ion battery anodes[J]. Chemical Communications, 2011, 47(1): 367-369.
[3]  Park M, Kim M G, Joo J, et al. Silicon nanotube battery anodes[J]. Nano Letters, 2009, 9(11): 3844-3847.
[4]  Jia H, Gao P, Yang J, et al. Novel three-dimensional mesoporous silicon for high power lithium-ion battery anode material[J]. Advanced Energy Materials, 2011, 1(6): 1036-1039.
[5]  Su L, Zhou Z, Ren M, et al. Core double-shell Si@SiO2@C nanocomposites as anode materials for Li-ion batteries[J]. Chemical Communications, 2010, 46(15): 2590-2592.
[6]  Pengfei Gao, Jianwei Fu, Jun Yang, et al. Microporous carbon coated silicon core/shell nanocomposite via in situ polymerization for advanced Li-ion battery anode material[J]. Physical Chemistry Chemical Physics, 2009, 11(47): 11101-11105.
[7]  Profatilova I A, Stack C, Schmitz A, et al. Enhanced thermal stability of a lithiated nano-silicon electrode by fluoroethylene carbonate and vinylene carbonate[J]. Journal of Power Sources, 2013, 222: 140-149.
[8]  Chen L B, Wang K, Xie X H, et al. Effect of vinylene carbonate (VC) as electrolyte additive on electrochemical performance of Si film anode for lithium ion batteries[J]. Journal of Power Sources, 2007, 174(2): 538-543.

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