A Reversible and Higher-Rate Li-O-2 Battery

作者：Peng, Zhangquan; Freunberger, Stefan A.; Chen, Yuhui; Bruce, Peter G.^*

来源：Science, 2012, 337(6094): 563-566.

DOI：10.1126/science.1223985

• LITHIUM-OXYGEN BATTERY
• LI-AIR BATTERIES
• CARBONATE ELECTROLYTES
• ELECTROCHEMISTRY
• SOLVENTS
• LIQUID
• ETHER
• O-2

The rechargeable nonaqueous lithium-air (Li-O-2) battery is receiving a great deal of interest because, theoretically, its specific energy far exceeds the best that can be achieved with lithium-ion cells. Operation of the rechargeable Li-O-2 battery depends critically on repeated and highly reversible formation/decomposition of lithium peroxide (Li2O2) at the cathode upon cycling. Here, we show that this process is possible with the use of a dimethyl sulfoxide electrolyte and a porous gold electrode (95% capacity retention from cycles 1 to 100), whereas previously only partial Li2O2 formation/decomposition and limited cycling could occur. Furthermore, we present data indicating that the kinetics of Li2O2 oxidation on charge is approximately 10 times faster than on carbon electrodes.

• 出版日期2012-8-3