In:
Nano-Micro Letters, Springer Science and Business Media LLC, Vol. 13, No. 1 ( 2021-12)
Abstract:
SeS 2 has become a promising cathode material owing to its enhanced electrical conductivity over sulfur and higher theoretical specific capacity than selenium; however, the working Li – SeS 2 batteries have to face the practical challenges from the severe shuttling of soluble dual intermediates of polysulfide and polyselenide, especially in high-SeS 2 -loading cathodes. Herein, a natural organic polymer, Nicandra physaloides pectin (NPP), is proposed to serve as an effective polysulfide/polyselenide captor to address the shuttling issues. Informed by theoretical calculations, NPP is competent to provide a Lewis base-based strong binding interaction with polysulfides/polyselenides via forming lithium bonds, and it can be homogeneously deposited onto a three-dimensional double-carbon conductive scaffold to finally constitute a polysulfide/polyselenide-immobilizing interlayer. Operando spectroscopy analysis validates the enhanced polysulfide/polyselenide trapping and high conversion efficiency on the constructed interlayer, hence bestowing the Li – SeS 2 cells with ultrahigh rate capability (448 mAh g −1 at 10 A g −1 ), durable cycling lifespan (≈ 0.037% capacity attenuation rate per cycle), and high areal capacity ( 〉 6.5 mAh cm −2 ) at high SeS 2 loading of 15.4 mg cm −2 . Importantly, pouch cells assembled with this interlayer exhibit excellent flexibility, decent rate capability with relatively low electrolyte-to-capacity ratio, and stable cycling life even under a low electrolyte condition, promising a low-cost, viable design protocol toward practical Li – SeS 2 batteries.
Type of Medium:
Online Resource
ISSN:
2311-6706
,
2150-5551
DOI:
10.1007/s40820-021-00629-z
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2021
detail.hit.zdb_id:
2642093-4
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