Details

Autor(en) / Beteiligte

• He, Jiarui
• Bhargav, Amruth
• Manthiram, Arumugam

Titel

In Situ Grown 1T′‐MoTe2 Nanosheets on Carbon Nanotubes as an Efficient Electrocatalyst and Lithium Regulator for Stable Lithium–Sulfur Full Cells

Ist Teil von

• Advanced energy materials, 2022-01, Vol.12 (1), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Wiley Blackwell Single Titles

Beschreibungen/Notizen

• Lithium–sulfur batteries offer the advantage of high energy density at a low cost, but their viability is hindered by the polysulfide shuttle effect, sluggish reaction kinetics, and dendritic Li growth. To address these persistent challenges in a unified manner, a dual‐function, flexible, free‐standing framework by coupling catalytic and lithiophilic 1T′‐MoTe2 nanosheets with conductive carbon nanotubes (MoTe2‐CNT), which serve as a host for both a sulfur cathode (S/MoTe2‐CNT) and a lithium‐metal anode (MoTe2‐CNT/Li) is presented here. MoTe2‐CNT not only guides a uniform growth of lithium within the framework, but also forms a thin, unique sulfide‐rich solid‐electrolyte interphase (SEI) composed of lithium thiotellurate on the Li surface when paired with a sulfur cathode. This SEI stabilizes Li deposition, suppresses electrolyte decomposition, and prevents Li loss, thereby prolonging cycle life. Full coin cells with a very low negative to positive electrode capacity ratio of ≈2.5 and a high areal capacity of 7.6 mA h cm−2 display 75% capacity retention after 500 cycles. The pouch cells fabricated with MoTe2‐CNT deliver a high capacity of 1533 mA h g−1 and energy density of 319 Wh kg−1 at a low electrolyte‐to‐capacity ratio of ≈2.9 µL [mA h]−1 and a low electrolyte‐to‐sulfur ratio of 4.5 µL mg−1. A dual‐function, flexible, free‐standing framework coupling catalytic and lithiophilic 1T′‐MoTe2 nanosheets with carbon nanotubes as an advanced host for both sulfur cathodes and lithium‐metal anodes is presented. A full cell with a low negative to positive electrode capacity ratio of only ≈2.5 displays stable cycling over 500 cycles, culminating in a high areal capacity of 7.6 mA h cm−2.