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具有改善的锂离子电池导电路径保留性能的硅/二氧化硅-导电聚合物核壳纳米球

Si/SiO -Conductive Polymer Core-Shell Nanospheres with an Improved Conducting Path Preservation for Lithium-Ion Battery.

作者信息

Park Eunjun, Kim Jeonghun, Chung Dong Jae, Park Min-Sik, Kim Hansu, Kim Jung Ho

机构信息

Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, South Korea.

Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, North Wollongong, New South Wales, 2500, Australia.

出版信息

ChemSusChem. 2016 Oct 6;9(19):2754-2758. doi: 10.1002/cssc.201600798. Epub 2016 Aug 30.

Abstract

Non-stoichiometric SiO based materials have gained much attention as high capacity lithium storage materials. However, their anode performance of these materials should be further improved for their commercial success. A conductive polymer, poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS), is employed as a flexible electrical interconnector to improve the electrochemical performance of Si/SiO nanosphere anode materials for lithium ion batteries (LIBs). The resulting Si/SiO -PEDOT:PSS core-shell structured material with the small amount (1 wt %) of PEDOT:PSS shows the improved initial reversible capacity of 968.2 mA h g with excellent long-term cycle performance over 200 cycles. These promising properties can be attributed to the use of the electroconductive and flexible PEDOT:PSS shell layer, which protects the electrical conduction pathways in the electrode from the large volume changes of silicon during cycling.

摘要

非化学计量比的SiO基材料作为高容量锂存储材料受到了广泛关注。然而,为了实现商业成功,这些材料的阳极性能仍需进一步提高。一种导电聚合物聚(3,4-乙撑二氧噻吩):聚(4-苯乙烯磺酸盐)(PEDOT:PSS)被用作柔性电互连材料,以改善锂离子电池(LIBs)中Si/SiO纳米球阳极材料的电化学性能。所得含有少量(1 wt %)PEDOT:PSS的Si/SiO -PEDOT:PSS核壳结构材料显示出改善的初始可逆容量,为968.2 mA h g,在超过200次循环中具有优异的长期循环性能。这些有前景的性能可归因于使用了导电且柔性的PEDOT:PSS壳层,该壳层在循环过程中保护电极中的导电通路免受硅的大体积变化影响。

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