To tackle the issue of low sulfur utilization and inferior cycle stability of sulfur cathode, we first report a new perovskite-type La_0.6Sr_0.4CoO_3-δ (LSC) immobilizer to anchor the intermediate polysulfides via chemical interaction. The experimental results and theoretical calculations demonstrate that Sr doping results in valence variation in Co along with oxygen vacancy; The Co ions with mixed valence have strong adsorption to the polysulfide ions while the existence of oxygen vacancy enhances the binding strength between Li₂S₄ and LSC. Based on LSC, a dual coxial LSC/[email protected] nanocable is successfully designed and fabricated. With a sulfur loading of 2.1 mg cm⁻², the LSC/[email protected] cathodes demonstrate a high reversible capacity of 996 mA h g⁻¹ at 0.5 C and an outstanding cycle stability with only 0.039% capacity fade per cycle over 400 cycles. Even with a high sulfur loading of 5.4 mg cm⁻², the LSC/[email protected] cathode can still deliver similar sulfur utilization and excellent cycling stability. The excellent cycle stability benefits from the chemical interaction between LSC and polysulfides, and the physical entrapment of the carbon shell. Moreover, the highly conductive [email protected] host and the porous interconnected fiber web-like architecture facilitate the mass transfer during charge/discharge process synchronously.

为了解决硫利用率低和硫阴极循环稳定性差的问题，我们首先报道了一种新型钙钛矿型La _0.6 Sr _0.4 CoO3 _-δ（LSC）固定剂，可通过化学相互作用固定中间多硫化物。实验结果和理论计算表明，Sr掺杂会导致Co的价态随氧空位的变化而变化。具有混合价的Co离子对多硫化物离子具有强吸附性，而氧空位的存在增强了Li ₂ S ₄与LSC之间的结合强度。基于LSC，成功设计和制造了双轴LSC / [受电子邮件保护的]纳米电缆。硫负荷为2.1 mg cm ^-2，LSC / [受电子邮件保护的]阴极在0.5 C下显示出996 mA h g ^-1的高可逆容量，并且具有出色的循环稳定性，在400次循环中，每个循环的容量衰减仅为0.039％。即使在5.4 mg cm ^-2的高硫负载下，LSC / [受电子邮件保护的]阴极仍可以提供相似的硫利用率和出色的循环稳定性。优异的循环稳定性得益于LSC和多硫化物之间的化学相互作用以及碳壳的物理截留。此外，高导电性（受电子邮件保护的）主体和多孔互连的纤维网状架构有助于在充电/放电过程中同步进行质量传递。