Elibol Meltem Karaismailoglu, Jiang Lihong, Xie Dongjiu, Cao Sijia, Pan Xuefeng, Härk Eneli, Lu Yan
Department for Electrochemical Energy Storage Helmholtz-Zentrum Berlin für Materialien und Energie Hahn-Meitner Platz 1 14109 Berlin Germany.
Department for Energy Science and Technology Turkish-German University Şahinkaya Cad. 106 İstanbul 34820 Turkey.
Glob Chall. 2023 May 13;7(7):2300005. doi: 10.1002/gch2.202300005. eCollection 2023 Jul.
Lithium-sulfur batteries with high energy density still confront many challenges, such as polysulfide dissolution, the large volume change of sulfur, and fast capacity fading in long-term cycling. Herein, a naturally abundant clay material, halloysite, is introduced as a sulfur host material in the cathode of Li-S batteries. Nickel oxide nanoparticles are embedded into the halloysite nanotubes (NiO@Halloysite) by hydrothermal and calcination treatment to improve the affinity of halloysite nanotubes to polysulfides. The NiO@Halloysite composite loaded with sulfur (S/NiO@Halloysite) is employed as the cathode of Li-S batteries, which combines the physical confinements of tubular halloysite particles and good chemical adsorption ability of NiO. The S/NiO@Halloysite electrode exhibits a high discharge capacity of 1205.47 mAh g at 0.1 C. In addition, it demonstrates enhanced cycling stability, retaining ≈60% of initial capacity after 450 cycles at 0.5 C. The synthesized NiO@Halloysite can provide a promising prospect and valuable insight into applying natural clay materials in Li-S batteries.
具有高能量密度的锂硫电池仍然面临许多挑战，例如多硫化物溶解、硫的体积变化大以及长期循环中容量快速衰减。在此，一种天然丰富的粘土材料——埃洛石，被引入作为锂硫电池阴极中的硫主体材料。通过水热和煅烧处理将氧化镍纳米颗粒嵌入埃洛石纳米管（NiO@埃洛石）中，以提高埃洛石纳米管对多硫化物的亲和力。负载硫的NiO@埃洛石复合材料（S/NiO@埃洛石）被用作锂硫电池的阴极，它结合了管状埃洛石颗粒的物理限制和NiO良好的化学吸附能力。S/NiO@埃洛石电极在0.1 C下表现出1205.47 mAh g的高放电容量。此外，它还表现出增强的循环稳定性，在0.5 C下450次循环后保留了约60%的初始容量。合成的NiO@埃洛石可为在锂硫电池中应用天然粘土材料提供有前景的前景和有价值的见解。
