Affiliation:
1. Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
2. Institute of Advanced Technology Beijing Institute of Technology Jinan 250300 China
3. Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081 China
Abstract
AbstractLithium‐oxygen batteries (LOBs) are well known for their high energy density. However, their reversibility and rate performance are challenged due to the sluggish oxygen reduction/evolution reactions (ORR/OER) kinetics, serious side reactions and uncontrollable Li dendrite growth. The electrolyte plays a key role in transport of Li+ and reactive oxygen species in LOBs. Here, we tailored a dilute electrolyte by screening suitable crown ether additives to promote lithium salt dissociation and Li+ solvation through electrostatic interaction. The electrolyte containing 100 mM 18‐crown‐6 ether (100‐18C6) exhibits enhanced electrochemical stability and triggers a solution‐mediated Li2O2 growth pathway in LOBs, showing high discharge capacity of 10 828.8 mAh gcarbon−1. Moreover, optimized electrode/electrolyte interfaces promote ORR/OER kinetics on cathode and achieve dendrite‐free Li anode, which enhances the cycle life. This work casts new lights on the design of low‐cost dilute electrolytes for high performance LOBs.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Cited by
3 articles.
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