4.8 Article

From Flower-Like to Spherical Deposition: A GCNT Aerogel Scaffold for Fast-Charging Lithium Metal Batteries

Journal

ADVANCED ENERGY MATERIALS
Volume 11, Issue 42, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102454

Keywords

fast-charging; graphene aerogels; lithium metal anodes; ultrahigh capacity retention; ultrahigh rates

Funding

  1. National Key Research and Development Program of China New Energy Project for Electric Vehicle [2016YFB0100204]
  2. National Natural Science Foundation of China [51772030, 51972030]
  3. Beijing Outstanding Young Scientists Program [BJJWZYJH01201910007023]

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The graphene/carbon nanotube composite aerogel as a stable host for a lithium metal anode is able to significantly decrease the local current density, enable spherical and uniform lithium deposition, and maintain high Coulombic efficiency in cycling experiments.
Lithium metal anode has attracted the attention of both academic and industrial community for its high specific capacity and lowest redox potential. However, uncontrollable growth of lithium dendrite and low Coulombic efficiency (CE) exclude it from real world applications, especially in the fast-charging area. Herein, a graphene/carbon nanotube composite (GCNT) aerogel as a stable host for a lithium metal anode is proposed. The porous aerogel with large surface area and high conductivity can significantly decrease the local current density to enable spherical and uniform lithium deposition. The GCNT aerogel electrode can maintain a high CE of 97.7% for 430 cycles at a current of 1 mA cm(-2) under a capacity of 1 mAh cm(-2) while symmetric cells can sustain a high current up to 8 mA cm(-2). The composite anode paired with a LiFePO4 cathode shows ultrahigh-rate capability of 18 C and ultrahigh capacity retention of 97.6% and average CE of 99.1% in the subsequent 570 cyclings at 4 C. When paired with the LiNi0.8Co0.1Mn0.1O2 cathode, the composite anode can also demonstrate a high rate of 10 C and achieve a high capacity retention of 83.2% and an average CE of 99.8% for the subsequent 470 cycles at 2 C.

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