Carbons Derived from Regenerated Spherical Cellulose as Anodes for Li‐Ion Batteries at Elevated Temperatures

Author:

Fischer Johanna12ORCID,Wolfram Lisa1,Oswald Steffen1,Fischer Steffen2,Mikhailova Daria1ORCID

Affiliation:

1. Leibniz Institute for Solid State and Material Research (IFW) Dresden e.V. Institut for Materials Chemistry (IMC) Helmholtzstraße 20 01069 Dresden Germany

2. TUD Dresden University of Technology Institut of plant and wood chemistry (IPWC) Pienner Straße 19 01737 Tharandt Germany

Abstract

AbstractBiomass‐based materials have emerged as a promising alternative to the conventional graphite anode in Li‐ion batteries due to their renewability, low cost, and environmental friendliness. Therefore, a facile synthesis method for porous hard carbons based on cellulose acetate microspheres and bead cellulose is used, and their application as anode materials in Li‐ion batteries is discussed. The resulting porous carbons exhibit promising electrochemical characteristics, including a reversible capacity of about 300 mAh g−1 at 0.1 C (37 mA g−1) after 50 cycles, and stable capacities up to 210 mAh g−1 over 1000 cycles at 1 C (372 mA g−1) in half‐cells for cellulose acetate microspheres carbonised at 1200 °C. Moreover, at 60 °C cellulose‐derived carbons show higher specific capacities than graphite (300 mAh g−1 vs 240 mAh g−1 at 1 C after 500 cycles), indicating their potential for use in high‐temperature applications. The different charge storage mechanisms of the prepared hard carbon materials and graphite are observed. While capacity of graphite is mainly controlled by the Faradaic redox process, the cellulose‐derived carbons combine Faradaic intercalation and capacitive charge adsorption.

Publisher

Wiley

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