Dual overcharge protection and solid electrolyte interphase-improving action in Li-ion cells containing a bis-annulated dialkoxyarene electrolyte additive

JOURNAL OF POWER SOURCES

卷:378

Article

Zhang, Jingjing^1,2  Shkrob, Ilya A.^1,2  Assary, Rajeev S.^1,3  Zhang, Shuo^1,2  Hu, Bin²  Liao, Chen^1,2  Zhang, Zhengcheng^1,2  Zhang, Lu^1,2 

[1] Argonne Natl Lab, Joint Ctr Energy Storage Res, 9700 South Cass Ave, Lemont, IL 60439 USA

[2] Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Lemont, IL 60439 USA

[3] Argonne Natl Lab, Div Mat Sci, 9700 South Cass Ave, Lemont, IL 60439 USA

关键词: Redox shuttle;    Electrolyte additive;    Overcharge protection;    High stability;    Low impedance;    Lithium-ion batteries;   

DOI  :  10.1016/j.jpowsour.2017.12.059

来源: Elsevier

【 摘 要 】

1,4-Dialkoxybenzene additives are commonly used as redox active shuttles in lithium-ion batteries in order to prevent runaway oxidation of electrolyte when overcharge conditions set in. During this action the shuttle molecule goes through a futile cycle, becoming oxidized at the cathode and reduced at the anode. Minimizing parasitic reactions in all states of charge is paramount for sustained protective action. Here we demonstrate that recently developed bis-annulated 9,10-bis(2-methoxyethoxy)-1,2,3,4,5,6,7,8-octahydro-1,4:5,8-dimethano-anthracene shuttle molecule (that yields exceptionally stable radical cations) survives over 120 cycles of overcharge abuse with 100% overcharge ratio at C/5 rate. Equally remarkably, in the presence of this additive the cell impedance becomes significantly lower compared to the control cells without the additive; this decrease is observed during the formation, normal cycling, and even under overcharge conditions. This unusual dual action has not been observed in other redox shuttle systems, and it presents considerable practical interest.

【 授权许可】

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