Silicon/Carbon Nanotube/BaTiO3 Nanocomposite Anode: Evidence for Enhanced Lithium-Ion Mobility Induced by the Local Piezoelectric Potential

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• 作者：Byoung-Sun Lee ; Jihyun Yoon ; Changhoon Jung ; Dong Young Kim ; Seung-Yeol Jeon ; Ki-Hong Kim ; Jun-Ho Park ; Hosang Park ; Kang Hee Lee ; Yoon-Sok Kang ; Jin-Hwan Park ; Heechul Jung ; Woong-Ryeol Yu ; Seok-Gwang Doo
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：February 23, 2016
• 年：2016
• 卷：10
• 期：2
• 页码：2617-2627
• 全文大小：760K
• ISSN：1936-086X

文摘

We report on the synergetic effects of silicon (Si) and BaTiO₃ (BTO) for applications as the anode of Li-ion batteries. The large expansion of Si during lithiation was exploited as an energy source via piezoelectric BTO nanoparticles. Si and BTO nanoparticles were dispersed in a matrix consisting of multiwalled carbon nanotubes (CNTs) using a high-energy ball-milling process. The mechanical stress resulting from the expansion of Si was transferred via the CNT matrix to the BTO, which can be poled, so that a piezoelectric potential is generated. We found that this local piezoelectric potential can improve the electrochemical performance of the Si/CNT/BTO nanocomposite anodes. Experimental measurements and simulation results support the increased mobility of Li-ions due to the local piezoelectric potential.