Interlayer-expanded molybdenum disulfide nanocomposites for electrochemical magnesium storage

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

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Abstract

© 2015 American Chemical Society. 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.
Original languageAmerican English
Pages (from-to)2194-2202
Number of pages1973
JournalNano Letters
DOIs
StatePublished - 11 Mar 2015

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Liang, Y., Yoo, H. D., Li, Y., Shuai, J., Calderon, H. A., Robles Hernandez, F. C., Grabow, L. C., & Yao, Y. (2015). Interlayer-expanded molybdenum disulfide nanocomposites for electrochemical magnesium storage. Nano Letters, 2194-2202. https://doi.org/10.1021/acs.nanolett.5b00388