N,S-Doped Porous Carbon Nanobelts Embedded with MoS Nanosheets as a Self-Standing Host for Dendrite-Free Li Metal Anodes.

Adv Sci (Weinh)

State Key Laboratory of Chemical Resource Engineering, Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.

Published: November 2022

AI Article Synopsis

  • Metallic lithium (Li) is a strong candidate for high-energy batteries, but issues like volume changes and dendrite formation make it challenging to use effectively.
  • We created a specialized host material made of N,S-doped porous carbon nanobelts with embedded MoS nanosheets to improve the performance of lithium metal anodes (LMAs).
  • This new material helps distribute lithium more evenly, reduces dendrite growth, supports fast lithium ion movement, and manages changes in lithium size during charging and discharging, resulting in a stable battery with impressive energy density and cycling performance.

Article Abstract

Metallic Li is one of the most promising anodes for high-energy secondary batteries. However, the enormous volume changes and severe dendrite formation during the Li plating/stripping process hinder the practical application of Li metal anodes (LMAs). We have developed a sulfate-assisted strategy to synthesize a self-standing host composed of N,S-doped porous carbon nanobelts embedded with MoS nanosheets (MoS @NSPCB) for use in LMAs. In situ measurements and theoretical calculations reveal that the uniformly distributed MoS derivatives within the carbon nanobelts serve as stable lithiophilic sites which effectively homogenize Li nucleation and suppress dendrite formation. In addition, the hierarchical porosity and 3D nanobelt networks ensure fast Li-ion diffusion and accommodate the volume change of Li deposits during the plating/stripping process. As a result, a Li-Li symmetric cell using the MoS @NSPCB host operates steadily over 1500 h with an ultralow voltage hysteresis (≈24.2 mV) at 3 mA cm /3 mAh cm . When paired with a LiFePO cathode, the current collector-free LMA endows the full cell with a high energy density of 460 Wh kg and good cycling performance (with a capacity retention of ≈70% even after 1600 cycles at 10 C).

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9661841PMC
http://dx.doi.org/10.1002/advs.202204232DOI Listing

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