A Combined Lithium Intercalation and Plating Mechanism Using Conductive Carbon‐Fiber Electrodes. Issue 5 (24th February 2022)

• Record Type: Journal Article
• Authors: Zijian Zhao, Tommy; Dose, Wesley M.; De Volder, Michael F. L.
• Is Part Of: Batteries & supercaps. Volume 5:Issue 5(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-24
• Subjects: lithium metal anode -- 3D structured electrode -- carbon fiber paper -- current collector -- high capacity; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202100399
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Lithium‐metal anodes (LMAs) are desirable for next‐generation rechargeable batteries because of their high energy density. However, in practical applications they are hindered by inhomogeneous and uncontrolled lithium‐dendrite deposition during cycling. Herein, we propose a dual charge storage mechanism, using freestanding carbon‐fiber paper (CFP) with carbon fillers electrode. These CFP electrodes are manufactured at an industrial scale and act both as a host for lithium (Li) intercalation and as a conductive and porous 3D scaffold for Li plating/stripping. The CFP electrode exhibits excellent long‐term cycling stability, as evidenced by Coulombic efficiencies of over 99.5 % on the 250 th cycle in CFP|Li half‐cells with a lithiation capacity of 1.5 mA h cm −2 and current density of 0.5 mA cm −2 . We also demonstrate that the CFPs are sufficiently electrically conductive to operate in small pouch cells without metal foil current collectors, further improving the energy density of the proposed electrodes. Abstract : A dual charge‐storage mechanism is proposed using freestanding carbon‐fiber paper (CFP) with carbon‐fillers electrode, balancing the advantages of existing intercalation anodes and Li‐metal anodes. These CFP electrodes act both as a host for Li intercalation and as a conductive, porous, and lithiophilic scaffold for Li plating/stripping.