Interface Engineering of Biomass‐Derived Carbon used as Ultrahigh‐Energy‐Density and Practical Mass‐Loading Supercapacitor Electrodes

Abstract

The development of flexible electrodes with high mass loading and efficient electron/ion transport is of great significance but still remains the challenge of innovating suitable electrode structures for high energy density application. Herein, for the first time, lignosulfonate-derived N/S-co-doped graphene-like carbon is in situ formed within an interface engineered cellulose textile through a sacrificial template method. Both experimental and theoretical calculations disclose that the formed pomegranate-like structure with continuous conductive pathways and porous characteristics allows sufficient ion/electron transport throughout the entire structures. As a result, the obtained flexible electrode delivers a remarkable integrated capacitance of 6534 mF cm −2 (335.1 F g −1 ) and a superior stability at an industrially applicable mass loading of 19.5 mg cm −2 . A pseudocapacitive cathode with ultrahigh capacitance of 7000 mF cm −2 can also be obtained based on the same electrode structure engineering. The asassembled asymmetric supercapacitor achieves a high areal capacitance of 3625 mF cm −2 , and a maximum energy density of 1.06 mWh cm −2 , outperforms most of other reported high-loading supercapacitors. This synthesis method and structural engineering strategy can provide materials design concepts and a wide range of applications in the fields of energy storage beyond supercapacitors.

Enhancement of Li2ZrO3 Modification of the Cycle Life of N/S-Doped LiMn0.5Fe0.5PO4/C Composite Cathodes for Lithium Ion Batteries

“…16 In particular, some surface modification strategies have achieved exciting results. Carbon-based coatings, such as pyrolytic carbon 17 and graphene, 18 can build an efficient conductive medium between the active particles and then promote the charge transfer in the cathodes. Lu et al 19 previously formed a carbon coating on the LiMn 0.5 Fe 0.5 PO 4 particles by natural agar pyrolysis, which enhanced the charge transfer in cathodes.…”

Recent Advances of Aqueous Electrolytes for Zinc‐Ion Batteries to Mitigate Side Reactions: A Review

“…[15] These structures can pierce the separator and cause a short circuit, leading to reduced battery performance and safety. [16] The strategies of inhibiting zinc dendrites has the following aspects: porous electrode structure design to reduce the local current or; (4) new separator, etc.…”

Dual Action of Lignin: Electrode and Electrolyte for Sustainable Supercapacitor Application

“…Based on the calculation and fitting (Figure S6, Supporting Information), the b value at anodic currents was estimated to be 0.99, which indicated the surfacecontrolled capacitive charge storage behavior. 32 We further disintegrated the capacitance from surface-controlled contribution and diffusion-controlled contribution by the following expression: 33,34 It was observed that the capacitance of the supercapacitor is mainly dominated by the surface-controlled contribution, as shown in Figure S7 (Supporting Information). Upon increasing the scan rate from 10 to 100 mV s −1 , the diffusion contribution decreases and the capacitance contribution increases.…”