Aqueous Zinc-Ion Storage in MoS₂ by Tuning the Intercalation Energy

Abstract

Aqueous Zn-ion batteries present a low cost, safe, and high-energy battery technology, but suffer from the lack of suitable cathode materials because of the sluggish intercalation kinetics associated with the large size of hydrated zinc ions. Herein we report an effective and general strategy to transform inactive intercalation hosts into efficient Zn 2+ storage materials through intercaltion energy tuning. Using MoS 2 as a model system, we show both experimentally and theoretically that even hosts with originally poor Zn 2+ diffusivity can allow fast Zn 2+ diffusion. Through simple interlayer spacing and hydrophilicity engineering that can be experimentally achieved by oxygen incorporation, the Zn 2+ diffusivity is boosted by 3 orders of magnitude, effectively enabling the otherwise barely active MoS 2 to achieve a high capacity of 232 mAh g -1 that is 10 times as its pristine form. The strategy developed in our work can be generally applied for enhancing the ion Experimental details and additional supporting data as noted in the main text (PDF).

Recent Advances in the Rational Design and Synthesis of Two‐Dimensional Materials for Multivalent Ion Batteries

“…in MoS 2 host material. [68] If the amount of oxygen incorporation is 5%,t he interlayer distance increasesf rom 6.2 to 9.5 (Figure 8a), and the Zn 2 + intercalation energy lowers due to the improved hydrophilicity.T he authors used ah ydrothermal reaction to synthesize MoS 2 nanosheets from thiourea (CS(NH 2 ) 2 ) and ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 O 24 ·4H 2 O). Once the reactiont emperature reached 180 8C, the oxygen-in-corporated MoS 2 (MoS 2 ÀO) was synthesized due to thiourea reacting with the MoÀOb onds from the undecomposed molybdate precursor.…”

“…a) XRD patterns of MoS 2 and MoS 2 ÀO. b) CV curves of MoS 2 ÀOa nd MoS 2 for the first threecycles at 0.1 mV s À1 .c)The long-term cycling performance of MoS 2 and MoS 2 ÀOa tacurrentd ensity of 1.0 Ag À1 .d )TEM images of MoS 2 (left) and MoS 2 ÀO (right) after the discharging process.R eproduced with permission [68]. Copyright 2019, American Chemical Society.um element was characterizedb yX PS.…”

How does Molybdenum Disulfide Store Charge: A Minireview

“…As early as 1980, prelithiated MoS 2 was applied and patented as ac athode material. [15a] In recent years,M oS 2 has been used as cathode materiali nv arious multivalent metal-ion batteries, such as zinc-, [16] magnesium-, [17] and aluminum-ion [18] batteries. When used as anode materials in LIBs, nanostructured MoS 2 can exhibit high capacities up to 1000-1200 mAh g À1 ,which is much higherthan its theoretical capacity of 670 mAh g À1 while bulk MoS 2 is inactivet owards Li + and shows poor cycling stability.…”

Beyond 1T‐phase? Synergistic Electronic Structure and Defects Engineering in 2H‐MoS2xSe2(1‐x) Nanosheets for Enhanced Hydrogen Evolution Reaction and Sodium Storage

“…In addition, the MX 2 materials are also proved to be promising candidates for sodium or lithium storage applications, because of their large interlayer space which is capable of reversibly storing sodium/ lithium ions . During the past several years, various techniques (strategies) such as defect engineering, phase engineering, interlayer spacing, hydrophilicity tuning, interface construction, or integration with conductive media etc. (for instance graphene, carbon nanotubes etc.…”