Spherical Polyelectrolyte Brushes Templated Hollow C@MnO Nanospheres as Sulfur Host Materials for Li−S Batteries. Issue 4 (16th March 2022)

• Record Type: Journal Article
• Authors: Xie, Dongjiu; Jouini, Oumeima; Mei, Shilin; Quan, Ting; Xu, Yaolin; Kochovski, Zdravko; Lu, Yan
• Is Part Of: ChemNanoMat. Volume 8:Issue 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-16
• Subjects: hollow nanospheres -- lithium-sulfur battery -- manganese monoxide -- sperical polyelectrolyte brushes; Nanochemistry -- Periodicals; Nanostructured materials -- Periodicals; Nanochemistry; Nanostructured materials; Periodicals; 541.2
• DOI: 10.1002/cnma.202100455
• Languages: English
• ISSNs: 2199-692X

Abstract

Abstract: Li−S battery has been considered as the next‐generation energy storage device, which still suffers from the shuttle effect of lithium polysulfides (LiPSs). In this work, mesoporous hollow carbon‐coated MnO nanospheres (C@MnO) have been designed and synthesized using spherical polyelectrolyte brushes (SPB) as template, KMnO4 as MnO precursor, and polydopamine as carbon source to improve the electrochemical performance of Li−S battery. The hollow C@MnO nanospheres enable the combination of physical confinement and chemical adsorption of the LiPSs. The thin carbon coating layer can provide good electrical conductivity and additional physical confinement to polysulfides. Moreover, the encapsulated MnO inside the carbon shell exhibits strong chemical adsorption to polysulfides. The constructed C@MnO/S cathode shows the discharge capacity of 1026 mAh g −1 at 0.1 C with 79% capacity retention after 80 cycles. The synthesized hollow C@MnO nanoparticles can work as highly efficient sulfur host materials, providing an effective solution to suppress the shuttle effect in Li−S battery. Abstract : As next‐generation energy storage device, Li−S battery suffers from the shuttle effect of lithium polysulfides. To mitigate this issue, mesoporous hollow carbon‐coated MnO nanospheres (C@MnO) have been designed and used as sulfur host material. The Li−S batteries with C@MnO/S as cathode delivers a discharge capacity of 412 mAh g −1 after 500 cycles at 1 C.