2016 : Novel SEI Formation of Flourine Functional Group Based Additive on MCMB Anode Surface for High Performance Lithium Ion Battery

Gunawan Nugroho ST, MT., Ph.D
Nur Laila Hamidah S.T., M.Sc.

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The Li-ion battery (LIB) technology is a fast developing field due to portable electronic devices and electric vehicles. However, especially for applications in the electromobility, new challenges, such as the cycle life, the rate capability, safety, and the irreversible capacity have to be overcome. The solid electrolyte interface (SEI) is a critical factor in influencing the performance of LIB. The SEI formation acts as a barrier for solvent co-intercalation that may lead to electrode exfoliation. On the other hand, excessive formation of SEI is undesirable because it consumes lithium ions and decreases the active surface area of the electrode,especially on anode surface, which causes irreversible capacity loss as well as power fade. The formation of the SEI layer is proceeded from the deposition of organic and inorganic compounds during the first charge discharge cycles. The composition of the SEI depends on the nature of the electrolyte and the type of active material on which the SEI is formed. Stable SEI that rich of organic compound such as ROCO2Li, and RCOLi is the key to enhance the performance of LIB. The addition of additive in electrolyte is one of the approaches to modulate the properties of SEI. This study evaluates the effect of the flourine functional group of malemaide based additive to the formation of SEI on the MCMB anode surface. \n\nKey word: solid electrolyte interface, fluorine functional group, mesocarbon microbead, lithium ion battery\n