The synergistic effect of carbon coating and CNTs compositing on the hard carbon anode for sodium ion batteries

Abstract

The synergistic effect of surface carbon coating and CNT compositing on mesoporous hard carbon was investigated. The sample showed excellent cyclic and rate performances, suggesting a highly efficient and easy scale-up approach to elevate hard carbons as anodes for SIBs.

Mesoporous Weaved Turbostratic Nanodomains Enable Stable Na+ Ion Storage and Micropore Filling is Revealed to be More Unsafe than Adsorption and Deintercalation

“…The observed first broad reduction peak at around 0.217 V was associated to the electrolyte decomposition reaction and the formation of a solid electrolyte interface (SEI), which disappeared in the subsequent cycles, confirming an irreversible process. The similar irreversible cathodic peak is observed in the cyclic voltammograms of the HC anode. , A predominant reduction peak was observed at 0.014 V, corroborating the Na + ion intercalation of the micropore filling mechanism , in the derived mesoporous HC anode (Figure a). Subsequently, a predominant anodic peak was observed at 0.185 V, corresponding to the Na + ion deintercalation from the MHCSs.…”

“…The similar irreversible cathodic peak is observed in the cyclic voltammograms of the HC anode. 61,62 A predominant reduction peak was observed at 0.014 V, corroborating the Na + ion intercalation of the micropore filling mechanism 28,48 in the derived mesoporous HC anode (Figure 4a). Subsequently, a predominant anodic peak was observed at 0.185 V, corresponding to the Na + ion deintercalation from the MHCSs.…”

Coaxial Hard Carbon‐coated Carbon Nanotubes as Anodes for Sodium‐ion Batteries

“…As mentioned before, hard carbon is adopted to provide high reversible specific capacity and the interior CNTs make contributions to high conductivity. [9] As discussed above, CNTs@C-180 are chosen to be annealed for further characterization and electrochemical tests. It is also worth noticing that the reference HCSs are distributed in a uniform size of ~200 nm (Figure S3).…”

“…Speaking of batteries, numerous advanced and latemodel techniques are necessary to be developed to meliorate energy storage to keep abreast with the development of the new era. [8][9][10] Lithium-ion batteries (LIBs) have dominated the power sources of portable electronic devices and electric vehicles for many years. [9,11] LIBs advantage over other counterparts on account of their high energy density, long cycle life, and low maintenance cost.…”

“…[8][9][10] Lithium-ion batteries (LIBs) have dominated the power sources of portable electronic devices and electric vehicles for many years. [9,11] LIBs advantage over other counterparts on account of their high energy density, long cycle life, and low maintenance cost. [12][13][14][15] While merely improving LIBs technology is unable to solve the deficiency and maldistribution of lithium resources, which impedes their large-scale application.…”