固-电解质中间相(SEI)对于锂离子电池可逆运行的重要性已得到公认,但对其化学的理解仍然不完整。当前关于主要有机SEI组分身份的共识是,它由碳酸二亚乙酯(LEDC)组成,该碳酸锂被认为具有高锂离子传导性,但电子传导性低(以保护Li / C电极) 。在这里,我们报告真实的LEDC和单碳酸锂锂(LEMC)的合成,结构和光谱表征。对在石墨阳极上生长的SEI的直接比较表明,LEMC而不是LEDC可能是SEI的主要成分。对LEMC和碳酸锂甲酯(LMC)的单晶X射线衍射研究显示出不寻常的层状结构和锂+协调环境。LEMC的Li +电导率> 1×10 -6 S cm -1,而LEDC几乎是离子绝缘体。还研究了LMC,LEMC和LEDC在二甲亚砜溶液中的复杂相互转化和平衡。
Gattow, G.; Kaesberger, F.-J., Zeitschrift fur Anorganische und Allgemeine Chemie
作者:Gattow, G.、Kaesberger, F.-J.
DOI:——
日期:——
Reactions in the Rechargeable Lithium–O<sub>2</sub> Battery with Alkyl Carbonate Electrolytes
作者:Stefan A. Freunberger、Yuhui Chen、Zhangquan Peng、John M. Griffin、Laurence J. Hardwick、Fanny Bardé、Petr Novák、Peter G. Bruce
DOI:10.1021/ja2021747
日期:2011.5.25
The nonaqueous rechargeable lithium-O-2 battery containing an alkyl carbonate electrolyte discharges by formation of C3H6(OCO2Li)(2), Li2CO3, HCO2Li, CH3CO2Li, CO2, and H2O at the cathode, due to electrolyte decomposition. Charging involves oxidation of C3H6(OCO2Li)(2), Li2CO3, HCO2Li, CH3CO2Li accompanied by CO2 and H2O evolution. Mechanisms are proposed for the reactions on discharge and charge. The different pathways for discharge and charge are consistent with the widely observed voltage gap in Li-O-2 cells. Oxidation of C3H6(OCO2Li)(2) involves terminal carbonate groups leaving behind the OC3H6O moiety that reacts to form a thick gel on the Li anode. Li2CO3, HCO2Li, CH3CO2Li, and C3H6(OCO2Li)(2) accumulate in the cathode on cycling correlating with capacity fading and cell failure. The latter is compounded by continuous consumption of the electrolyte on each discharge.
Yildirimyan, H.; Gattow, G., Zeitschrift fur Anorganische und Allgemeine Chemie
作者:Yildirimyan, H.、Gattow, G.
DOI:——
日期:——
YILDIRIMYAN, H.;GATTOW, G., Z. ANORG. UND ALLG. CHEM., 1985, 521, N 2, 135-144
作者:YILDIRIMYAN, H.、GATTOW, G.
DOI:——
日期:——
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