Chloride Ion as Redox Mediator in Reducing Charge Overpotential of Aprotic Lithium‐Oxygen Batteries
Source abstract
Abstract
Abstract The aprotic lithium‐oxygen (Li−O2) 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 Li2O2 products is a major obstacle for realizing the high energy efficiency and long cycle life. Here, we report a new Cl−/Cl3− 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 Li2O2 to LiOH and provides new insights toward the role of redox mediators through the addition of Cl− in Li−O2 battery systems.
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Research context
OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Advanced battery technologies research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry National University of Singapore 3 Science Drive 3 117543 Singapore
National University of Singapore (Suzhou) Research Institute 377 Lin Quan Street Suzhou Industrial Park Jiang Su 215123 P. R. China
Department of Physics National University of Singapore Singapore 2 Science Drive 3 117542 Singapore
Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical Engineering Southeast University Nanjing 211189 China
Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Lab for Nanotechnology School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 P. R. China
Funding
National Research Foundation Singapore
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