Published July 28, 2022 | Version v1
Journal article Open

A Lithium–Sulfur Battery Using Binder-Free Graphene-Coated Aluminum Current Collector

  • 1. BeDimensional S.p.A, 16163 Genoa, Italy
  • 2. Istituto Italiano di Tecnologia, 16163 Genoa, Italy

Description

Lithium–sulfur battery of practical interest requires thin-layer support to achieve acceptable volumetric energy density. However, the typical aluminum current collector of Li-ion battery cannot be efficiently used in the Li/S system due to the insulating nature of sulfur and a reaction mechanism involving electrodeposition of dissolved polysulfides. We study the electrochemical behavior of a Li/S battery using a carbon-coated Al current collector in which the low thickness, the high electronic conductivity, and, at the same time, the host ability for the reaction products are allowed by a binder-free few-layer graphene (FLG) substrate. The FLG enables a sulfur electrode having a thickness below 100 μm, fast kinetics, low impedance, and an initial capacity of 1000 mAh gS–1 with over 70% retention after 300 cycles. The Li/S cell using FLG shows volumetric and gravimetric energy densities of 300 Wh L–1 and 500 Wh kg–1, respectively, which are values well competing with commercially available Li-ion batteries.

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Additional details

Funding

GrapheneCore3 – Graphene Flagship Core Project 3 881603
European Commission