المؤلفون: Lars C. Grabow, Hyun Deog Yoo, Francisco C. Robles Hernandez, Yanliang Liang, Hector A. Calderon, Jing Shuai, Yan Yao, Yifei Li

المصدر: Nano Letters. 15:2194-2202

مصطلحات موضوعية: Nanocomposite, Materials science, Mechanical Engineering, Intercalation (chemistry), Inorganic chemistry, Bioengineering, General Chemistry, Electrolyte, Condensed Matter Physics, Electrochemistry, Cathode, Energy storage, Anode, law.invention, chemistry.chemical_compound, chemistry, Chemical engineering, law, General Materials Science, Molybdenum disulfide

الوصف: Mg rechargeable batteries (MgRBs) represent a safe and high-energy battery technology but suffer from the lack of suitable cathode materials due to the slow solid-state diffusion of the highly polarizing divalent Mg ion. Previous methods improve performance at the cost of incompatibility with anode/electrolyte and drastic decrease in volumetric energy density. Herein we report interlayer expansion as a general and effective atomic-level lattice engineering approach to transform inactive intercalation hosts into efficient Mg storage materials without introducing adverse side effects. As a proof-of-concept we have combined theory, synthesis, electrochemical measurement, and kinetic analysis to improve Mg diffusion behavior in MoS2, which is a poor Mg transporting material in its pristine form. First-principles simulations suggest that expanded interlayer spacing allows for fast Mg diffusion because of weakened Mg-host interactions. Experimentally, the expansion was realized by inserting a controlled amount of poly(ethylene oxide) into the lattice of MoS2 to increase the interlayer distance from 0.62 nm to up to 1.45 nm. The expansion boosts Mg diffusivity by 2 orders of magnitude, effectively enabling the otherwise barely active MoS2 to approach its theoretical storage capacity as well as to achieve one of the highest rate capabilities among Mg-intercalation materials. The interlayer expansion approach can be leveraged to a wide range of host materials for the storage of various ions, leading to novel intercalation chemistry and opening up new opportunities for the development of advanced materials for next-generation energy storage.

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e80e8dbad9f226b51a675e3cbff2905d
https://doi.org/10.1021/acs.nanolett.5b00388