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Investigation on the Cyclability of Lithium‐Oxygen Cells in a Confined Potential Window using Cathodes with Pre‐filled Discharge Products
Author(s) -
Geng Dongsheng,
Ding Ning,
Hor T. S. Andy,
Chien Sheau Wei,
Liu Zhaolin,
Zong Yun
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201500355
Subject(s) - electrolyte , battery (electricity) , lithium (medication) , cathode , materials science , oxygen , electrode , degradation (telecommunications) , specific energy , chemical engineering , depth of discharge , bottleneck , energy storage , nanotechnology , chemistry , computer science , power (physics) , medicine , telecommunications , physics , organic chemistry , quantum mechanics , engineering , embedded system , endocrinology
Abstract With new chemistry and advantageous configuration, the lithium‐oxygen (Li‐O 2 ) battery promises a much higher specific energy than traditional lithium‐ion batteries. The limited understanding on the complicated battery reactions therein, however, has become a major bottleneck of its development for applications requiring a high energy efficiency and long cycle‐life. Herein, in a confined potential window with negligible electrolyte degradation, we studied the rechargeability of Li‐O 2 cathodes with pre‐filled well‐defined discharge products of Li 2 O 2 , Li 2 CO 3 , LiOH, or their combinations. Our results suggest Li 2 CO 3 as the most difficult species to be electrochemically decomposed among the three lithium compounds, whereas the presence of LiOH notably increases the initial charge potential. The clearly visible difference in the charge behavior and cycling stability of these artificially “discharged” electrodes provides a guideline for the development of future high‐performance Li‐O 2 batteries.