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Nanohybrid Material Research Group

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Nanohybrid Material Research Group

Department of Materials Science and Engineering, Kookmin Univ.

RESEARCH

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Energy Storage (Batteries)


Secondary ion batteries have been extensively investigated in various fields including electric and hybrid vehicles, information technology, aerospace, etc. considering attractive properties such as long cycle life, high energy density, portable size, low weight, flexible body, few memory effects, and low pollution. Our group demonstrates the utilization of various nanomaterials as anode materials for Li-ion battery. And now, we’re working on the high capacity, high energy density free-standing anode for battery applications. We are also interested in other areas of battery (e.g. Battery thermal management) and next-generation batteries.


We propose a method to enhance the durability of anodes made from a Sn -TiO2 composite supported by 3D graphene structure. This mechanism involves combining the high lithium storage capacity of Sn with TiO2, while a 3D graphene network provides support and electrical conductivity. This structure minimizes physical deformation during cycles through a dual buffering structure, delivering high capacity retention and long cycle life. [1]

Also, we fabricate silicon-based anode that is both printable and free-standing, eliminating the need for a conventional current collector. This electrode design mitigates the issue of silicon’s volume expansion by hollow structure, reduces the overall weight and complexity of the electrodes, improves energy density, ultimately leading to improved battery performance. [2]


Relevant Publication  


1
Ryu, J.; Kim, H.; Kang, J.; Bark, H.; Park, S.*; Lee, H.*, Dual Buffering Inverse Design of Three-Dimensional Graphene-Supported Sn-TiO2 Anodes for Durable Lithium-Ion Batteries. Small 2020, 16 (46), e2004861.
2 Je, M.; Ham, M.; Kim, S.; Park, Y.; Park, S.*, & Lee, H.* ,Printable and Free-Standing Silicon-Based Anode for Current Collector-Free Lithium-Ion Batteries. ACS Applied Materials & Interfaces 2023, 15(44), 51215-51224.