Rechargeability of Li-air cathodes pre-filled with discharge products using an ether-based electrolyte solution: implications for cycle-life of Li-air cells

被引:185
作者
Meini, Stefano [1 ]
Tsiouvaras, Nikolaos [1 ]
Schwenke, K. Uta [1 ]
Piana, Michele [1 ]
Beyer, Hans [1 ]
Lange, Lukas [1 ]
Gasteiger, Hubert A. [1 ]
机构
[1] Tech Univ Munich, Inst Tech Electrochem, D-85748 Garching, Germany
关键词
NONAQUEOUS LI-O-2 BATTERIES; CARBONATE ELECTROLYTES; OXYGEN REDUCTION; LITHIUM; STABILITY; CAPACITY; SOLVENTS; ELECTROCHEMISTRY; CATALYSTS;
D O I
10.1039/c3cp51112j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The instability of currently used electrolyte solutions and of the carbon support during charge-discharge in non-aqueous lithium-oxygen cells can lead to discharge products other than the desired Li2O2, such as Li2CO3, which is believed to reduce cycle-life. Similarly, discharge in an O-2 atmosphere which contains H2O and CO2 impurities would lead to LiOH and Li2CO3 discharge products. In this work we therefore investigate the rechargeability of model cathodes pre-filled with four possible Li-air cell discharge products, namely Li2O2, Li2CO3, LiOH, and Li2O. Using Online Electrochemical Mass Spectrometry (OEMS), we determined the charge voltages and the gases evolved upon charge of pre-filled electrodes, thus determining the reversibility of the formation/electrooxidation reactions. We show that Li2O2 is the only reversible discharge product in ether-based electrolyte solutions, and that the formation of Li2CO3, LiOH, or Li2O is either irreversible and/or reacts with the electrolyte solution or the carbon during its oxidation.
引用
收藏
页码:11478 / 11493
页数:16
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