Effects of Structural Substituents on the Electrochemical Decomposition of Carbonyl Derivatives and Formation of the Solid–Electrolyte Interphase in Lithium-Ion Batteries

Energies

Mehran Javanbakht¹  Hamid Omidvar²  Xinhua Zhu³  Mesfin Haile Mamme³  Annick Hubin³  Hamidreza Behi⁴  Maitane Berecibar⁴  Joeri Van Mierlo⁴  S. Hamidreza Beheshti⁴ 

[1] Department of Chemistry, Amirkabir University of Technology, Tehran 159163-4311, Iran;Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran 159163-4311, Iran;Electrochemical and Surface Engineering Group, Department of Materials and Chemistry, Vrije Universiteit Brussel, 1050 Brussels, Belgium;Research Group MOBI–Mobility, Logistics and Automotive Technology Research Centre, Vrije Universiteit Brussel, 1050 Brussels, Belgium;

关键词: solid–electrolyte interphase;    electrolyte additive;    molecular tunning;    SEI stability;    irreversible capacity loss;    lithium-ion battery;   

DOI  :  10.3390/en14217352

来源: DOAJ

【 摘 要 】

The solid–electrolyte interphase (SEI), the passivation layer formed on anode particles during the initial cycles, affects the performance of lithium-ion batteries (LIBs) in terms of capacity, power output, and cycle life. SEI features are dependent on the electrolyte content, as this complex layer originates from electrolyte decomposition products. Despite a variety of studies devoted to understanding SEI formation, the complexity of this process has caused uncertainty in its chemistry. In order to clarify the role of the substituted functional groups of the SEI-forming compounds in their efficiency and the features of the resulting interphase, the performance of six different carbonyl-based molecules has been investigated by computational modeling and electrochemical experiments with a comparative approach. The performance of the electrolytes and stability of the generated SEI are evaluated in both half-cell and full-cell configurations. Added to the room-temperature studies, the cyclability of the NMC/graphite cells is assessed at elevated temperatures as an intensified aging condition. The results show that structural adjustments within the SEI-forming molecule can ameliorate the cyclability of the electrolyte, leading to a higher capacity retention of the LIB cell, where cinnamoyl chloride is introduced as a novel and more sustainable SEI forming agent with the potential of improving the LIB capacity retention.

【 授权许可】

Unknown