The severe shuttle effect and sluggish redox kinetics are the current bottlenecks of lithium-sulfur (Li-S) batteries, resulting in capacity fading and inferior rate performance, especially under the condition of high sulfur loading and low electrolyte/sulfur ratio (E/S). Herein, conductive carbon nanoparticles (Ketjen Black, KB) covered by borocarbonitride (BCN) are assembled into micro-sized particles to form a polar KB@BCN hybrid, which is employed as a sulfur host with enhanced tap density via a facile intergrowth method. At a molecular level, BCN, endowed with abundant adsorption sites as the adsorbent and catalyst, can adsorb polysulfides and catalyze the conversion of polysulfides. On the nanometer scale, the BCN is loaded on the highly conductive KB nanoparticles, which can improve the conductivity of the hybrid (1786 S m⁻¹), thereby improving the conversion of polysulfides. On the micrometer scale, the BCN and the KB nanoparticles together form micro-sized particles to improve the tap density, which is beneficial to build thick electrodes and reduce the amount of electrolyte. When applied as a sulfur cathode, KB@BCN-2 shows good cycling capability (a low-capacity decay of 0.05% after 800 cycles at 0.5C) and high rate performance (765 mA h g⁻¹ at 3.0C). Even under a lean electrolyte condition (E/S = 5 μL mg⁻¹), the KB@BCN-2-S has a high initial capacity of 1266 mA h g⁻¹ at 0.1C. Significantly, incorporating polar electrocatalysts with carbon matrix to form a high-density sulfur host through secondary granulation can provide a new insight for achieving high-performance Li-S batteries.

严重的穿梭效应和缓慢的氧化还原动力学是目前锂硫（Li-S）电池的瓶颈，导致容量衰减和倍率性能较差，尤其是在高硫负载和低电解液/硫比（E/S ）。在此，被硼碳氮化物（BCN）覆盖的导电碳纳米粒子（Ketjen Black，KB）组装成微米级粒子，形成极性 KB@BCN 杂化物，通过简单的共生方法将其用作具有增强振实密度的硫主体。在分子水平上，BCN作为吸附剂和催化剂具有丰富的吸附位点，可以吸附多硫化物并催化多硫化物的转化。在纳米尺度上，BCN 负载在高导电性 KB 纳米粒子上，可以提高杂化（1786 S m^-1 )，从而提高多硫化物的转化率。在微米尺度上，BCN和KB纳米粒子共同形成微米级粒子，提高振实密度，有利于构建厚电极和减少电解质用量。当用作硫正极时，KB@BCN-2 表现出良好的循环能力（0.5C 下 800 次循环后低容量衰减为 0.05%）和高倍率性能（3.0C 下765 mA hg ^-1）。即使在贫电解质条件下（E/S = 5 μL mg ^-1），KB@BCN-2-S 也具有 1266 mA hg ^-1的高初始容量在 0.1C。重要的是，将极性电催化剂与碳基质结合以通过二次造粒形成高密度硫主体可以为实现高性能锂硫电池提供新的见解。