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3D CoSe@C Aerogel as a Host for Dendrite‐Free Lithium‐Metal Anode and Efficient Sulfur Cathode in Li–S Full Cells

Journal Article · · Advanced Energy Materials
 [1];  [1]
  1. Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA
Abstract

Lithium–sulfur batteries are appealing due to their high energy density and low cost. However, their commercial viability is challenged by uncontrollable dendritic Li growth and severe polysulfide shuttling during cycling. Here, a 3D framework coupling lithiophilic and catalytic CoSe nanoparticles with conductive carbon nanowires (CoSe@C) as an efficient host both for lithium and sulfur is reported. As a cathode host, CoSe@C offers highly efficient catalytic activity for polysulfide redox. As a rationally designed matrix with a high affinity for Li, CoSe@C guides a homogenous growth of Li within the 3D framework, which effectively suppresses dendritic Li growth. As a result, the CoSe@C/Li anode exhibits an ultralong lifespan of > 3000 h with a low overpotential of <23 mV. Remarkably, a full cell with a S/CoSe@C cathode and a CoSe@C/Li anode with a low negative to positive electrode capacity (N/P) ratio of ≈4 exhibits long cycle life of over 600 cycles with a high areal capacity of 5.8 mA h cm −2 . It also remains stable after 50 cycles even with lean electrolyte (E/S: 4.5 µL mg −1 ) and a low N/P ratio of ≈4. This work offers new insights and opportunities for developing dendrite‐free, high‐performance Li–S battery technology.

Sponsoring Organization:
USDOE
OSTI ID:
1786088
Alternate ID(s):
OSTI ID: 1850920
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 41 Vol. 10; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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