Threshold potentials for fast kinetics during mediated redox catalysis of insulators in Li–O2 and Li–S batteries
نویسندگان
چکیده
Redox mediators could catalyse otherwise slow and energy-inefficient cycling of Li–S Li–O2 batteries by shuttling electrons or holes between the electrode solid insulating storage materials. For to work efficiently they need oxidize with fast kinetics but lowest possible overpotential. However, dependence overpotential is unclear, which hinders informed improvement. Here, we find that when redox potentials are tuned via, for example, Li+ concentration in electrolyte, exhibit distinct threshold potentials, where accelerate several-fold within a range as small 10 mV. This phenomenon independent types mediator electrolyte. The acceleration originates from overpotentials required activate Li+/e− extraction following chemical step at specific abundant surface facets. Efficient catalysis solids therefore requires careful consideration conditions materials electrolyte-dependent may be salt concentrations solvents. batteries. An investigation mediated Li2S Li2O2 oxidations various reveals high reaction rates, can optimized multiple ways.
منابع مشابه
Lithium salts for advanced lithium batteries: Limetal, LiO2, and LiS
Presently lithium hexafluorophosphate (LiPF6) is the dominant Li-salt used in commercial rechargeable lithium-ion batteries (LIBs) based on a graphite anode and a 3–4 V cathode material. While LiPF6 is not the ideal Li-salt for every important electrolyte property, it has a uniquely suitable combination of properties (temperature range, passivation, conductivity, etc.) rendering it the overall ...
متن کاملdiagnostic and developmental potentials of dynamic assessment for writing skill
این پایان نامه بدنبال بررسی کاربرد ارزیابی مستمر در یک محیط یادگیری زبان دوم از طریق طرح چهار سوال تحقیق زیر بود: (1) درک توانایی های فراگیران زمانیکه که از طریق برآورد عملکرد مستقل آنها امکان پذیر نباشد اما در طول جلسات ارزیابی مستمر مشخص شوند; (2) امکان تقویت توانایی های فراگیران از طریق ارزیابی مستمر; (3) سودمندی ارزیابی مستمر در هدایت آموزش فردی به سمتی که به منطقه ی تقریبی رشد افراد حساس ا...
15 صفحه اولsimulation and experimental studies for prediction mineral scale formation in oil field during mixing of injection and formation water
abstract: mineral scaling in oil and gas production equipment is one of the most important problem that occurs while water injection and it has been recognized to be a major operational problem. the incompatibility between injected and formation waters may result in inorganic scale precipitation in the equipment and reservoir and then reduction of oil production rate and water injection rate. ...
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature Catalysis
سال: 2022
ISSN: ['2520-1158']
DOI: https://doi.org/10.1038/s41929-022-00752-z