Monodispersed FeS2 Electrocatalyst Anchored to Nitrogen-Doped Carbon Host for Lithium–Sulfur Batteries
Artikel i vetenskaplig tidskrift, 2022

Despite their high theoretical energy density, lithium–sulfur (Li–S) batteries are hindered by practical challenges including sluggish conversion kinetics and shuttle effect of polysulfides. Here, a nitrogen-doped continuous porous carbon (CPC) host anchoring monodispersed sub-10 nm FeS2 nanoclusters (CPC@FeS2) is reported as an efficient catalytic matrix for sulfur cathode. This host shows strong adsorption of polysulfides, promising the inhibition of polysulfide shuttle and the promoted initial stage of catalytic conversion process. Moreover, fast lithium ion (Li-ion) diffusion and accelerated solid–solid conversion kinetics of Li2S2 to Li2S on CPC@FeS2 host guarantee boosted electrochemical kinetics for conversion process of sulfur species in Li–S cell, which gives a high utilization of sulfur under practical conditions of high loading and low electrolyte/sulfur (E/S) ratio. Therefore, the surfur cathode (S/CPC@FeS2) delivers a high specific capacity of 1459 mAh g−1 at 0.1 C, a stable cycling over 900 cycles with ultralow fading rate of 0.043% per cycle, and an enhanced rate capability compared with cathode only using carbon host. Further demonstration of this cathode in Li–S pouch cell shows a practical energy density of 372 Wh kg−1 with a sulfur loading of 7.1 mg cm−2 and an E/S ratio of 4 µL mg−1.

pouch cells

lithium–sulfur batteries

high energy densities

high sulfur loading

electrocatalyses

Författare

Weiwei Sun

National University of Defense Technology

Shuangke Liu

National University of Defense Technology

Yujie Li

National University of Defense Technology

Danqin Wang

National University of Defense Technology

Qingpeng Guo

National University of Defense Technology

Xiaobin Hong

National University of Defense Technology

K Xie

National University of Defense Technology

Zhongyun Ma

Xiangtan University

Chunman Zheng

National University of Defense Technology

Shizhao Xiong

Chalmers, Fysik, Materialfysik

Advanced Functional Materials

1616-301X (ISSN) 16163028 (eISSN)

Vol. 32 43 2205471

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemiteknik

DOI

10.1002/adfm.202205471

Mer information

Senast uppdaterat

2024-03-07