3D Ag@C Cloth for Stable Anode Free Sodium Metal Batteries
- 18 January 2021
- journal article
- research article
- Published by Wiley in Small Methods
- Vol. 5 (4), e2001050
- https://doi.org/10.1002/smtd.202001050
Abstract
While sodium metal anodes (SMAs) feature many performance advantages in sodium ion batteries (SIBs), severe safety concerns remain for using bulk sodium electrodes. Herein, a 3D Ag@C natrophilic substrate prepared by a facile thermal evaporation deposition method, which can be employed as a much safer “anode‐free” SMA, is reported. Initially, there is no bulk sodium on the Ag@C substrate in the assembled SIBs. Upon charging, sodium will be uniformly deposited onto the Ag@C substrate and afterwards functions as a real SMA, thus inheriting the intrinsic merits of SMA and enhancing safety simultaneously. While cycling, the as‐synthesized substrate demonstrates superior sodium plating/stripping cycling stability at 1, 2 and 3 mA cm−2 with a capacity of 2 mAh cm−2. Theoretical simulations reveal that Na ions prefer to bind with Ag and form a Na‐Ag network, thus clearly revealing uniform sodium deposition on the Ag@C substrate. More importantly, a full battery based on Ag@C and Prussian white with impressive Coulomb efficiency (CE), high rate capability (from 0.1 C to 5 C) and long‐term cycling life is illustrated for the first time, thus making Ag@C feasible for the establishment of “anode‐free” SIBs with reduced cost, high gravimetric/volumetric energy density and enhanced safety.Keywords
Funding Information
- University of Hong Kong (9678157)
- Innovation and Technology Commission (ITS/219/19)
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