Anion-redox nanolithia cathodes for Li-ion batteries

被引：0
|
作者：
Zhu, Zhi [1 ,2 ]
Kushima, Akihiro [1 ,2 ]
Yin, Zongyou [1 ,2 ]
Qi, Lu [3 ]
Amine, Khalil [4 ]
Lu, Jun [4 ]
Li, Ju [1 ,2 ]
机构：
[1] MIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA
[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
[3] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
[4] Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA
来源：
NATURE ENERGY | 2016年 / 1卷
关键词：
OXYGEN; DISPROPORTIONATION; LINI0.5MN1.5O4; MOBILITY;
D O I：
10.1038/NENERGY.2016.111
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
The development of lithium-air batteries is plagued by a high potential gap (>1.2 V) between charge and discharge, and poor cyclability due to the drastic phase change of O-2 (gas) and Ox- (condensed phase) at the cathode during battery operations. Here we report a cathode consisting of nanoscale amorphous lithia (nanolithia) confined in a cobalt oxide, enabling charge/discharge between solid Li2O/Li2O2/LiO2 without any gas evolution. The cathode has a theoretical capacity of 1,341 Ah kg(-1), a mass density exceeding 2.2 g cm(-3), and a practical discharge capacity of 587 Ah kg(-1) at 2.55V versus Li/Li+. It also displays stable cycling performance (only 1.8% loss after 130 cycles in lithium-matched full-cell tests against Li4Ti5O12 anode), as well as a round-trip overpotential of only 0.24V. Interestingly, the cathode is automatically protected from O-2 gas release and overcharging through the shuttling of self-generated radical species soluble in the carbonate electrolyte.
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页数：7
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