A Flexible 3D Multifunctional MgO‐Decorated Carbon Foam@CNTs Hybrid as Self‐Supported Cathode for High‐Performance Lithium‐Sulfur Batteries

Abstract

One of the critical challenges to develop advanced lithium-sulfur (Li-S) batteries lies in exploring a high efficient stable sulfur cathode with robust conductive framework and high sulfur loading. Herein, a 3D flexible multifunctional hybrid is rationally constructed consisting of nitrogen-doped carbon foam@CNTs decorated with ultrafine MgO nanoparticles for the use as advanced current collector. The dense carbon nanotubes uniformly wrapped on the carbon foam skeletons enhance the flexibility and build an interconnected conductive network for rapid ionic/electronic transport. In particular, a synergistic action of MgO nanoparticles and in situ N-doping significantly suppresses the shuttling effect via enhanced chemisorption of lithium polysulfides. Owing to these merits, the as-built electrode with an ultrahigh sulfur loading of 14.4 mg cm −2 manifests a high initial areal capacity of 10.4 mAh cm −2 , still retains 8.8 mAh cm −2 (612 mAh g −1 in gravimetric capacity) over 50 cycles. The best cycling performance is achieved upon 800 cycles with an extremely low decay rate of 0.06% at 2 C. Furthermore, a flexible soft-packaged Li-S battery is readily assembled, which highlights stable electrochemical characteristics under bending and even folding. This cathode structural design may open up a potential avenue for practical application of high-sulfur-loading Li-S batteries toward flexible energy-storage devices.

Multifunctional Heterostructures for Polysulfide Suppression in High‐Performance Lithium‐Sulfur Cathode

“…Ultraviolet–visible (UV–vis) absorption tests are also used to compare the adsorbability of DCC and DCC@MoS 2 /PrNP/CNTs toward LiPS. Both patterns manifest an adsorption peak between 200 and 350 nm, which is attributed to a high concentration of polysulfide ions . Compared with the blank Li 2 S 6 solution, the sample adding only DCC exhibits weak adsorption of S 6 2− ions.…”

A New Anode for Lithium‐Ion Batteries Based on Single‐Walled Carbon Nanotubes and Graphene: Improved Performance through a Binary Network Design

“…The galvanostatic charge/discharge voltagep rofiles for the first three cycles were performed at ac urrent density of 0.1 Ag À1 within the potential range 0.01-3.0 Vv ersus Li/Li + + (Figure 4a). [31][32][33][34][35] In the first charge process, ap lateau was located at 0.1-0.3 V, which corresponded to Li deintercalation from LiC 6 . [31][32][33][34][35] In the first charge process, ap lateau was located at 0.1-0.3 V, which corresponded to Li deintercalation from LiC 6 .…”

Three‐Dimensional Interconnected Porous Nitrogen‐Doped Carbon Hybrid Foam for Notably Promoted Direct Dehydrogenation of Ethylbenzene to Styrene

“…[1] Various strategies have been adopted to prepare 3D carbon materials, such as self-assemble method, [2] direct-templated chemical vapor deposition (CVD) [3] and carbonization of 3D organic templates [4] , and the fruitful 3D structured carbon matrix has been fabricated (e. g., 3D graphene aerogel, [5] carbon foam [6] and 3D CNTs foam [7] ). [1] Various strategies have been adopted to prepare 3D carbon materials, such as self-assemble method, [2] direct-templated chemical vapor deposition (CVD) [3] and carbonization of 3D organic templates [4] , and the fruitful 3D structured carbon matrix has been fabricated (e. g., 3D graphene aerogel, [5] carbon foam [6] and 3D CNTs foam [7] ).…”

“…Consequently, the formed carbon foam possesses both interconnected 3D macroporous framework derived from 3D organic precursor and versatile micro/nano-scale characteristics from the fine substances wrapping the carbon skeleton. [6] Yang group proceeded the pioneering work which nitrogen-containing 3D porous carbon monolith manufactured through a one-step pyrolysis method using a high quality urea loaded melamine sponge precursor. Furthermore, for the merit of abundant nitrogen content on the surface of carbon materials, enhanced negative charges mobility and ample nitrogen vacancies, nitrogen-doped carbon foam is attractive for heterogeneous catalysis and electrodes preparation.…”