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Tetraethylammonium Tetrafluoroborate Additives for Suppressed Gas Formation and Increased Cycle Stability of Dual-ion Battery
Electrochimica Acta ( IF 6.6 ) Pub Date : 2020-01-21 , DOI: 10.1016/j.electacta.2020.135711
Ryutaro Nozu , Eiko Suzuki , Okitoshi Kimura , Nobuaki Onagi , Tatsumi Ishihara

Effect of tetraethylammonium tetrafluoroborate (TEABF4) additives on the charge and discharge properties and gas formation in dual ion battery using graphitic carbon and Li4Ti5O12 for positive and negative electrode, respectively was investigated. Although cycle stability was poor and large amount of gas was formed in dual ion battery using LiPF6 for a support salt, it was found that the reversibility of charge and discharge and cycle stability was much increased by addition of TEABF4. By using LiPF6 + TEABF4 in dimethyl carbonate (DMC)-methyl ethyl carbonate (MEC)-propylene carbonate (PC) (1:1:1), discharge capacity of 60 % of initial capacity was sustained after 1,017 cycles with 99% coulomb efficiency and negligible amount of gas was formed. These positive effects of TEABF4 addition were assigned to the suppression of side reaction on electrode, in particular, at Li4Ti5O12 negative electrode. Lewis acidity in electrolyte seems to be related with electrolyte decomposition and decreased cycle stability was caused by the unbalanced capacity of interaction between positive and negative electrode.



中文翻译:

四氟硼酸四乙铵添加剂可抑制双离子电池的气体形成并提高循环稳定性

研究了四氟硼酸四乙铵(TEABF 4)添加剂对分别使用石墨碳和Li 4 Ti 5 O 12作为正极和负极的双离子电池的充放电性能和气体形成的影响。尽管在使用LiPF 6作为支持盐的双离子电池中循环稳定性差并且形成大量气体,但是发现通过添加TEABF 4可以大大提高充电和放电的可逆性以及循环稳定性。通过使用LiPF 6 + TEABF 4在碳酸二甲酯(DMC)-碳酸甲基乙基乙酯(MEC)-碳酸丙烯酯(PC)(1:1:1)中,在1,017次循环后,放电容量维持了初始容量的60%,库仑效率为99%,气体量可忽略成立了。TEABF 4的这些积极作用被认为是抑制了电极上的副反应,特别是在Li 4 Ti 5 O 12负极上。电解质中的路易斯酸度似乎与电解质分解有关,而循环稳定性的下降是由于正极和负极之间相互作用能力的不平衡引起的。

更新日期:2020-01-22
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