4.8 Article

Deciphering interpenetrated interface of transition metal oxides/phosphates from atomic level for reliable Li/S electrocatalytic behavior

Journal

NANO ENERGY
Volume 81, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.nanoen.2020.105602

Keywords

Interpenetrated interface; Electronic modulation; Polysulfides; Lithium; sulfur batteries; Catalytic behavior

Funding

  1. Natural Science Foundation of Hebei Province of China, China [B2019202277, B2020202052]
  2. Program for the Outstanding Young Talents of Hebei Province, China
  3. Chunhui Project of Ministry of Education of the People's Republic of China [Z2017010]
  4. Xijiang RD Team
  5. Guangdong Provincial Science and Technology Plan Project, China [2018A050506025]
  6. Guangdong Innovative and Entrepreneurial Team Program [2016ZT06C517]
  7. Science and Technology Program of Guangzhou [2019050001]
  8. Science and Technology Program of Zhaoqing [2019K038]
  9. Natural Sciences and Engineering Research Council of Canada
  10. Waterloo Institute for Nanotechnology
  11. University of Waterloo

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An electronic modulation strategy was developed to regulate the catalytic behavior of transition metal oxides/transition metal phosphates interface towards Li/S surface chemistry, improving the redox reaction kinetics in lithium/sulfur batteries.
Lithium/sulfur (Li/S) batteries have superior advantages in their high energy-density and environmental benignity. However, the notorious shuttle effect of lithium polysulfides (LiPSs) and their sluggish redox reaction kinetics hinder their practical implementation. Herein, a electronic modulation strategy was developed to regulate the catalytic behavior of transition metal oxides (TMOs)/transition metal phosphates (TMPs) interface towards Li/S surface chemistry. Thus, the reduced energy gap between the energy centers of the cation 3d and anion 2p band in O-M-P bridging (M refers to the transition elements) effectively reduce the energy barrier of LiPSs conversion and improve the electron transfer owing to the interdoping effect, which further functions as catalytic centers to active the M sites for regulating LiPSs adsorption-diffusion-conversion process. Benefited from these structural advantages, the engineered TMOs/TMPs exhibits admirable electrocatalytic sulfur reaction kinetics based on theoretical calculations and electrochemical analyzations. As expected, the TMOs/TMPs sulfur cathode exhibits an ultralow capacity fading rate of 0.033% per cycle at 1C over 500 cycles. Even under raising sulfur loadings and lean electrolyte content, this cathode still exhibits outstanding electrochemical performance.

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