{"64181":{"#nid":"64181","#data":{"type":"event","title":"MSE Ph.D. Proposal - Kara Evanoff","body":[{"value":"\u003Cp\u003ETitle:\nHighly Structured Nano-Composite Anodes for Secondary\nLithium Ion Batteries\u003C\/p\u003E\n\n\n\n\n\n\n\n\u003Cp\u003ESummary:Lithium-ion (Li-ion) battery technology\nis of particular interest due to its high energy and power characteristics that\nare adaptable to meet the needs of existing and emerging applications ranging\nfrom electronics to transportation to electrical grid stability. High capacity\nbulk materials (silicon, germanium), explored to advance beyond the current\nindustry standard (graphite) anode, pose a critical challenge to long battery\nlifetimes due to large volume changes of the host material as a result of Li\ninsertion\/extraction. Without sufficient mechanical robustness of silicon- or\ngermanium- based anodes and without free space available in the electrode for\nvolume expansion, the significant stresses generated during cell operation\ncommonly lead to rapid capacity losses and mechanical degradation of the anode.\n\u003C\/p\u003E\n\n\n\n\u003Cp\u003EAnodes\ncomprised of nanomaterials have been investigated as alternatives to bulk\nmaterials since their constrained dimensions may provide increased\nelectrochemical activity and improved mechanical stability.\u0026nbsp; Several types\nof nanocomposites materials were found to offer good electrochemical\nperformance but the lack of fundamental understanding of structure-property\nrelationship in these composites limit further developments of high capacity\nanode technology. \u003C\/p\u003E\n\n\n\n\u003Cp\u003EThe proposed research considers two\nanode architectures which can be generally described as a carbon substrate\n(graphene or vertically aligned carbon nanotubes) coated with combinations of\nLi ion reactive layers (silicon, germanium, carbon). The anodes are similar in\ncomposition but differ in microstructure. These differences allow for further\nexamination of the relationship between material structure, material\nproperties, and anode performance.\u0026nbsp; This research has already demonstrated\nthat highly structured and tunable composite anodes can be created through\nvapor deposition techniques with stable performance and specific capacity\nbeyond state-of-the art graphite achieved. Further investigation of the\nmechanisms that may lead to degradation of these systems are currently being\nexplored to further enhance the anode stability. \u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"MSE\nPh.D. Proposal \u2013 Kara Evanoff Highly Structured Nano-Composite Anodes for Secondary Lithium Ion\nBatteries","format":"limited_html"}],"field_summary_sentence":[{"value":"MSE Ph.D. Proposal - Kara Evanoff"}],"uid":"27388","created_gmt":"2011-02-10 15:08:55","changed_gmt":"2016-10-08 01:54:05","author":"Bill Miller","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2011-02-10T13:15:00-05:00","event_time_end":"2011-02-10T15:00:00-05:00","event_time_end_last":"2011-02-10T15:00:00-05:00","gmt_time_start":"2011-02-10 18:15:00","gmt_time_end":"2011-02-10 20:00:00","gmt_time_end_last":"2011-02-10 20:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1238","name":"School of Materials Science and Engineering"}],"categories":[],"keywords":[{"id":"10802","name":"MSE_Interal_Event"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}