Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Reactions in the Rechargeable Lithium-O-2 Battery with Alkyl Carbonate Electrolytes
AU - Freunberger, Stefan A.
AU - Chen, Yuhui
AU - Peng, Zhangquan
AU - Griffin, John M.
AU - Hardwick, Laurence J.
AU - Barde, Fanny
AU - Novak, Petr
AU - Bruce, Peter G.
PY - 2011/5/25
Y1 - 2011/5/25
N2 - 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.
AB - 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.
KW - LI-AIR BATTERIES
KW - SUPEROXIDE ION
KW - LITHIUM/OXYGEN BATTERY
KW - PROPYLENE CARBONATE
KW - OXYGEN BATTERIES
KW - APROTIC MEDIA
KW - DISPROPORTIONATION
KW - DECOMPOSITION
KW - ELECTRODES
KW - DISCHARGE
U2 - 10.1021/ja2021747
DO - 10.1021/ja2021747
M3 - Journal article
VL - 133
SP - 8040
EP - 8047
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 20
ER -