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Nanoscale Wetting in Lithium Ion Battery Cathodes Jian Luo, Clemson University, DMR 0448879

Nanoscale Wetting in Lithium Ion Battery Cathodes Jian Luo, Clemson University, DMR 0448879.

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Nanoscale Wetting in Lithium Ion Battery Cathodes Jian Luo, Clemson University, DMR 0448879

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  1. Nanoscale Wetting in Lithium Ion Battery CathodesJian Luo, Clemson University, DMR 0448879 Background: Kang & Ceder of MIT showed that the formation of a “fast ion-conducting surface phase” on the LiFePO4 particles enabled ultrafast charging and discharging of Li-ion batteries [Kang & Ceder, Nature 458, 190 (2009)]. We demonstrated that the nanoscale surface films observed by Kang & Ceder exhibit a “self-selecting” thickness, akin to those that we have systematically studied in this CAREER program [1]. Such surface films can form from 1st-order transitions [2] and be stabilized by attractive van der Waals forces [3]. We also observed similar intergranular films in battery materials. These unique nanoscale wetting phenomena can be utilized to make novel ionic materials for energy applications. [1] Luo & Chiang, Ann. Rev. Mater. Res. 38, 227-49 (2008) [2] Qian & Luo, ActaMaterialia56, 4702-14 (2008) [3] Qian, Luo & Chiang, ActaMaterialia 56, 862-73 (2008) Fast ion-conducting surface film Nanoscale interfacial films of “self-selecting” thickness in battery cathodes (Kayyar, Qian & Luo, Appl. Phys. Lett., submitted)

  2. Summer Research for High School Students Jian Luo, Clemson University, DMR 0448879 • During 2006-2009, 15 high school students have conducted summer research on this CAREER project in our lab. These education and outreach activities were conducted in conjunction with 3 on-campus programs: • 7 students  5 weeks via the EUREKA! program of the Clemson University Calhoun Honors College • 2 student  6 weeks from via SPRI of the South Carolina Governor's School for Science & Mathematics • 6 students  2 weeks via the Sirrine Scholars program of the Clemson University School of Materials Science Engineering • In summer 2009, 3 students have all together conducted 16 student-weeks of summer research work. A rising high school senior of South Carolina Governor's School for Science and Mathematics was presenting a poster about his 6-week summer research in our lab July 17, 2009. Clemson Hendrix Center

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