The Synergy of La2O3 Nanoparticles and Graphene for Advanced Li‐S Batteries. Issue 10 (14th March 2022)

• Record Type: Journal Article
• Authors: Li, Yiding; Sun, Kai; Cheng, Pu; Li, Jianjun; Liu, Dequan; He, Deyan
• Is Part Of: ChemistrySelect. Volume 7:Issue 10(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-14
• Subjects: Li−S battery -- Synergy -- La2O3 nanoparticles -- Graphene -- Polysulfides -- Absorption; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202104328
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: As a promising alternative for next‐generation energy storge devices, lithium‐sulfur batteries suffer from polysulfide shuttle and the inherent slow kinetics under long‐ term operating and high mass loading which mainly cause by the absence of available immobilizer and conversion mediators. Herein, La2 O3 nanoparticles anchored on graphene composite is designed and demonstrates a high‐performance sulfur immobilizer and conversion promoter. Benefiting from the composite, the corresponding Li−S batteries display good cycling stability (capacity fading rate 0.051 % per cycle after 500 cycles), high initial specific capacity (1423.7 mA h g −1 at 0.2 A g −1 ), and excellent cycling performance at high sulfur loading (5.03 mg cm −2 ). The results of experiments and density functional theoretical (DFT) calculations revealed that the La2 O3 nanoparticles is a desirable separator modification material that can effectively tuning the absorption and conversion interactions with polysulfides through S−La and Li−O chemical bonds. Abstract : The hybrid materials that combine La2 O3 and Graphene takes full advantage of the synergistic effect. In the composite materials, graphene offers excellent electron transfer and large specific surface area, while La2 O3 nanoparticles promote the LiPSs conversion due to the polar surface. Deriving from the synergistic effect, the cells show high sulfur utilization, conversion and performance stability with added La2 O3 /Graphene layer.