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Chloride Ion as Redox Mediator in Reducing Charge Overpotential of Aprotic Lithium‐Oxygen Batteries
Author(s) -
Zhang Qi,
Zhou Yin,
Dai Wenrui,
Cui Xinhang,
Lyu Zhiyang,
Hu Zheng,
Chen Wei
Publication year - 2021
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.202000198
Subject(s) - overpotential , electrolyte , redox , lithium (medication) , chemistry , battery (electricity) , energy storage , inorganic chemistry , chemical engineering , electrochemistry , electrode , thermodynamics , medicine , power (physics) , physics , engineering , endocrinology
The aprotic lithium‐oxygen (Li−O 2 ) battery with a high theoretical energy density has been considered as a promising candidate for next‐generation energy storage devices. However, the formation of insulating Li 2 O 2 products is a major obstacle for realizing the high energy efficiency and long cycle life. Here, we report a new Cl − /Cl 3 − redox mediator to reduce the charge overpotential by a facile introduction of chloride ion (Cl − ) additives into the organic electrolyte. The redox mediator can effectively promote the formation of the LiOH discharge product, and facilitate efficient LiOH decomposition. Therefore, the cell with the Cl − additives possesses a significantly low charge overpotential of 0.29 V, an extended cycle life (up to 71 cycles) at a rate of 500 mA g −1 with a fixed capacity of 500 mAh g −1 , and an enhanced rate capability. This study offers an effective approach to modulate discharge products from Li 2 O 2 to LiOH and provides new insights toward the role of redox mediators through the addition of Cl − in Li−O 2 battery systems.