Photoresist Derived Carbon Films as High Capacity Anodes for Lithium Ion Battery

Kakunuri, M and Sharma, Chandra Shekhar (2014) Photoresist Derived Carbon Films as High Capacity Anodes for Lithium Ion Battery. In: 225th ECS Meeting, May 11 – 15, 2014, Orlando, FL.

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Abstract

An epoxy based negative photoresist (SU-8) was spin coated on stainless steel (SS) wafer followed by two step pyrolysis in inert atmosphere to yield dense carbon films to be used as anode for lithium (Li) ion battery. The selection of SS wafer as a substrate was in accordance with commercial Li ion battery architecture. Cyclic voltammogram confirms the passive layer formation by electrolyte decomposition in the initial cycle. Galvanostatic charge discharge experiments performed at 0.1 C rate within 0.01-3 V confirms the reversible intercalation of Li ions and shows higher gravimetric reversible capacity for these photoresist derived carbon films on SS wafer substrate than graphite (400 mAh/g vs. 372 mAh/g for graphite). This high reversible capacity may be attributed to high disorderness in photoresist derived carbon as characterized by x-ray diffraction and Raman spectroscopy.

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