Anion-redox nanolithia cathodes for Li-ion batteries

被引：0
|
作者：
Zhu Z. [1 ,2 ]
Kushima A. [1 ,2 ]
Yin Z. [1 ,2 ]
Qi L. [3 ]
Amine K. [4 ]
Lu J. [4 ]
Li J. [1 ,2 ]
机构：
[1] Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, 02139, MA
[2] Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, 02139, MA
[3] College of Chemistry and Molecular Engineering, Peking University, Beijing
[4] Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, 60439, IL
来源：
Nature Energy | / 1卷 / 8期
关键词：
D O I：
10.1038/nenergy.2016.111
中图分类号：
学科分类号：
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 O x' (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 Li 2 O/Li 2 O 2 /LiO 2 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 2.55 V versus Li/Li +. It also displays stable cycling performance (only 1.8% loss after 130 cycles in lithium-matched full-cell tests against Li 4 Ti 5 O 12 anode), as well as a round-trip overpotential of only 0.24 V. 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. © Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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