Microarchitectures of Carbon Nanotubes for Reversible Na Plating/Stripping Toward the Development of Room‐Temperature Na–S Batteries
Chhail Bihari Soni, Nitika Arya, Sungjemmenla, S. K. Vineeth, Viswanath Balakrishnan, Vipin Kumar
Abstract
An ordered and homogeneous deposition of sodium metal is pivotal in achieving reversible and long‐term stability of the metal battery. The sodium deposition critically depends on the local interfacial properties of the anode/electrolyte interface. Due to the hostless nature of sodium metal anode, the integrity of the interface deteriorates rapidly, leading to a rise in stripping/plating overpotential or premature cell failure. Herein, well‐ordered microarchitectures of carbon nanotubes (MACNTs) as a potential host for reversible and highly stable stripping/plating of sodium metal are reported. Besides accommodating sodium metal, the MACNT host facilitates the formation of inorganic‐rich solid–electrolyte interphase over the sodium metal anode. As a result, it can achieve stripping/plating reversibility for 1200 h at a current of 1 mA cm −2 . An overpotential of about 30 mV occurs for the stripping/plating process, indicating uniform and compact deposition of sodium. Moreover, when applying to a room‐temperature Na–FeS 2 battery, the MACNT host achieves stable cycling for over 200 cycles at 200 mA g −1 and delivers a capacity of about 210 mA h g −1 .