For high‐energy lithium–sulfur batteries, the poor volumetric energy density is a bottleneck as compared with lithium–ion batteries, due to the low density of both the sulfur active material and sulfur host. Herein, in order to enhance the volumetric energy density of sulfur cathode, a universal approach is proposed to fabricate a compact sulfur cathode with dense materials as sulfur host, instead of the old‐fashioned lightweight carbon nanomaterials. Based on this strategy, heavy lanthanum strontium manganese oxide (La_0.8Sr_0.2MnO₃), with a high theoretical density of up to 6.5 g cm⁻³, is introduced as sulfur host. Meanwhile, the La_0.8Sr_0.2MnO₃ host also acts as an efficient electrocatalyst to accelerate the diffusion, adsorption, and redox dynamics of lithium polysulfides in the charge–discharge processes. As a result, such S/La_0.8Sr_0.2MnO₃ cathode presents high gravimetric/volumetric capacity and outstanding cycling stability. Moreover, an ultra‐high volumetric energy density of 2727 Wh L⁻¹_‐cathode is achieved based on the densification effect with higher density (1.69 g cm⁻³), which is competitive to the Ni‐rich oxide cathode (1800–2160 Wh L⁻¹) of lithium–ion batteries. The current study opens up a path for constructing high volumetric capacity sulfur cathode with heavy and catalytic host toward practical applications of lithium–sulfur batteries.

中文翻译：

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用于锂硫电池的具有重催化金属氧化物主体的高体积能量密度硫阴极。

对于高能锂硫电池来说，由于硫活性材料和硫主体的密度较低，与锂离子电池相比，体积能量密度差是一个瓶颈。在此，为了提高硫阴极的体积能量密度，提出了一种通用方法，以致密材料作为硫主体来制造紧凑的硫阴极，而不是老式的轻质碳纳米材料。基于该策略，引入理论密度高达6.5 g cm ^{-3的重镧锶锰氧化物（La} _0.8 Sr _0.2 MnO _{3 ）作为硫主体。}同时，La _0.8 Sr _0.2 MnO ₃主体还充当有效的电催化剂，加速多硫化锂在充放电过程中的扩散、吸附和氧化还原动力学。因此，这种S/La _0.8 Sr _0.2 MnO ₃正极表现出高的重量/体积容量和出色的循环稳定性。此外，基于更高密度（1.69 g cm ^{-3 ）的致密化效应，实现了2727 Wh L -1}_阴极的超高体积能量密度，这与富镍氧化物阴极（1800–2160 Wh）具有竞争力。 L ⁻¹ ) 的锂离子电池。目前的研究为构建具有重催化主体的高体积容量硫阴极走向锂硫电池的实际应用开辟了道路。