A facile one‐step synthesis of bio‐inspired porous graphitic carbon sheets for improved lithium‐sulfur battery performance

Abstract

The development of cost-effective carbon materials with tunable porosity for energy storage applications is challenging. In this study, a facile one-step in situ chemical activation process was adopted to synthesize porous graphitic carbon sheets (GCSs) from a tissue paper. The resulting GCS exhibits high specific surface area, large pore volume, and a highly graphitized carbon structure with graphene-like morphology. Sulfur-infused GCSs with optimum sulfur loading along with GCS-coated separator deliver a high initial discharge capacity of 1643 mAh g À1 at 0.1C rate. Moreover, when the electrode is tested at a high current rate of 1C, the cell delivered excellent cyclic stability of 652 mAh g À1 over 200 cycles. The improved electrochemical performance attributes to the unique properties of GCS, which functions as an efficient host matrix as well as an interlayer by constraining the dissolved polysulfides in addition to the enhancement in ionic and electronic conductivities.

A High‐Energy Density Li‐Ion Hybrid Capacitor Fabricated from Bio‐Waste Derived Carbon Nanosheets Cathode and Graphite Anode

“…The sp 2 hybridized graphitic layers and tangential vibration of carbon atoms symbolic of their degree of graphitization and conductivity is indicated by the G‐band. [ 3 ] In contrast, the D‐band is representative of the defects in the edge planes and graphitic layers. It can be observed from Figure 2b, that an improvement in the number of sp 2 hybridized carbon atoms is exhibited by the reduction in D‐band and enhancement in G‐band intensity after activation.…”

“…[1] Nevertheless, the low energy density (<10 Wh kg −1 ) restricts their individual commercialization. [3] materials leads to the rationale understanding that the energy and power densities of LIHCs mainly depend on the cathode counterparts due to the asymmetric device fabrication and huge difference in the ratio of specific capacity of cathode:anode. [1] In this context, different types of carbon materials have been extensively studied as cathode materials for LIHCs due to their high conductivity, ease of availability, tunable physical and chemical properties, and high economic value.…”

“…[ 1 ] Nevertheless, the low energy density (<10 Wh kg −1 ) restricts their individual commercialization. [ 3 ] Hence, the quest for a single energy storage system equipped with both high energy and power characteristics along with good rate and stability seems insatiable. Early 2000s has seen the advent of Li‐ion hybrid capacitors (LIHC) which conjugates a high‐capacity anode capable of high charge acceptance with reversible Li‐ion insertion and de‐insertion and a high surface area porous cathode with efficient ion adsorption properties exhibiting electrical double layer charge (EDLC) storage behavior.…”

Renewable biomass-derived carbon-based hosts for lithium–sulfur batteries

“…have been converted into BDC with the micro–mesoporous structure for LSBs (Table 1). For example, Harimohan et al 119 adopted tissue papers as a precursor to obtain porous graphitic carbon sheets. The composite cathode exhibited highly reversible and stable electrochemical performance.…”

Performance evaluation of coated carbon foam material in heat exchanger applications

“…They found that such anode shows excellent electrochemical properties compared to commercial graphite. Additionally, Harimohan et al 20 used a chemical activation method to synthesize porous carbon sheets from tissue paper. They discovered that the new sheets display higher specific surface area and large pore volume.…”