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Majid Shaker,Ali Asghar Sadeghi Ghazvini,Reza Riahifar,Asim Mumtaz 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.4
Herein, we present a new model to investigate the cause of the low initial coulombic efficiency of lithium-ion battery (LIB)porous carbon anodes and discover its relationship with the porosity of these materials. According to the proposed model,the capacity of porous carbon LIB anodes is in a direct relationship with their porosity, which reduces by the formation ofthe solid electrolyte interphase (SEI) layer occupying the cavities and decreasing the accessible surface area for the electrolyte. The introduced model in this study was compared with the data published in the literature and revealed a satisfactoryagreement with them. As a result, it was concluded that the fraction of the mesopores occupied by SEI after the 1st cyclefluctuates around the value of 0.5 and is mostly in the range of 0.6−0.4. Thereby, it can be employed for the prediction ofthe first cycle coulombic efficiency (CE) of carbonaceous anodes as LIB anodes and optimization of their structure.
Shaker Majid,Ghazvini Ali Asghar Sadeghi,Qureshi Faisal Raza,Riahifar Reza 한국탄소학회 2021 Carbon Letters Vol.31 No.5
The high level of lithium storage in synthetic porous carbons has necessitated the development of accurate models for estimating the specifc capacity of carbon-based lithium-ion battery (LIB) anodes. To date, various models have been developed to estimate the storage capacity of lithium in carbonaceous materials. However, these models are complex and do not take into account the efect of porosity in their estimations. In this paper, a novel model is proposed to predict the specifc capacity of porous carbon LIB anodes. For this purpose, a new factor is introduced, which is called normalized surface area. Considering this factor, the contribution of surface lithium storage can be added to the lithium stored in the bulk to have a better prediction. The novel model proposed in this study is able to estimate the lithium storage capacity of LIB anodes based on the porosity of porous carbons for the frst time. Benefting porosity value (specifc surface area) makes the predictions quick, facile, and sensible for the scientists and experts designing LIBs using porous carbon anodes. The predicted capacities were compared with that of the literature reported by experimental works. The remarkable consistency of the measured and predicted capacities of the LIB anodes also confrms the validity of the approach and its reliability for further predictions.