Lithium–sulfur batteries are appealing due to their high energy density and low cost. However, their commercial viability is challenged by uncontrollable dendritic Li growth and severe polysulfide shuttling during cycling. Here, a 3D framework coupling lithiophilic and catalytic CoSe nanoparticles with conductive carbon nanowires (CoSe@C) as an efficient host both for lithium and sulfur is reported. As a cathode host, CoSe@C offers highly efficient catalytic activity for polysulfide redox. As a rationally designed matrix with a high affinity for Li, CoSe@C guides a homogenous growth of Li within the 3D framework, which effectively suppresses dendritic Li growth. As a result, the CoSe@C/Li anode exhibits an ultralong lifespan of > 3000 h with a low overpotential of <23 mV. Remarkably, a full cell with a S/CoSe@C cathode and a CoSe@C/Li anode with a low negative to positive electrode capacity (N/P) ratio of ≈4 exhibits long cycle life of over 600 cycles with a high areal capacity of 5.8 mA h cm⁻². It also remains stable after 50 cycles even with lean electrolyte (E/S: 4.5 µL mg⁻¹) and a low N/P ratio of ≈4. This work offers new insights and opportunities for developing dendrite‐free, high‐performance Li–S battery technology.

中文翻译：

---

3D CoSe @ C气凝胶作为Li-S电池中无枝晶锂金属阳极和高效硫阴极的主体

锂硫电池具有高能量密度和低成本，因此颇具吸引力。然而，它们的商业生存能力受到不可控制的树枝状Li的生长和循环过程中严重的多硫化物穿梭的挑战。在这里，报道了将锂硫和催化CoSe纳米粒子与导电碳纳米线（CoSe @ C）耦合为锂和硫的有效基质的3D框架。作为阴极主体，CoSe @ C为多硫化物氧化还原提供了高效的催化活性。作为对锂具有高亲和力的合理设计的基质，CoSe @ C可以在3D框架内引导Li的均匀生长，从而有效抑制树枝状Li的生长。结果，CoSe @ C / Li阳极具有> 3000 h的超长寿命，且<23 mV的低过电势。值得注意的是⁻²。即使使用稀薄的电解质（E / S：4.5 µL mg ^-1）和低的N / P比（≈4），它在50个循环后也保持稳定。这项工作为开发无枝晶，高性能锂电池技术提供了新的见识和机会。