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Quantum-Sized Co Nanoparticles with Rich Vacancies Enabled the Uniform Deposition of Lithium Metal and Fast Polysulfide Conversion
Small ( IF 13.0 ) Pub Date : 2024-09-11 , DOI: 10.1002/smll.202406908 Jinsheng Rong 1 , Jiangjiang Zhang 1 , Wenxin Wang 1 , Junqian Miao 1 , Lanli Chen 2 , Shiqiang Cui 1
Small ( IF 13.0 ) Pub Date : 2024-09-11 , DOI: 10.1002/smll.202406908 Jinsheng Rong 1 , Jiangjiang Zhang 1 , Wenxin Wang 1 , Junqian Miao 1 , Lanli Chen 2 , Shiqiang Cui 1
Affiliation
The notorious polysulfide shuttling and uncontrollable Li-dendrite growth are the main obstacles to the marketization of Li-S batteries. Herein, a dual-functional material consisting of vacancy-rich quantum-sized Co nanodots anchored on a mesoporous carbon layer (v-Co/meso-C) is proposed. This material exposes more active sites to improve its reaction performance and simultaneously realizes excellent lithiophilicity and sulfiphilicity characteristics in Li-S electrochemistry. As Li metal deposition hosts, v-Co/meso-C shows small nucleation overpotential, low polarization, and ultra-long cycling stability in both half and symmetric cells, as confirmed by experimental studies. On the S cathode side, experimental and theoretical calculations demonstrate that v-Co/meso-C enhances the adsorption of polysulfides and boosts their catalytic conversion rate. This, in turn, suppresses the shuttle effect of polysulfides and improves sulfur utilization efficiency. Finally, a shuttle-free and dendrite-free v-Co/meso-C@Li//v-Co/meso-C@S full cell is fabricated, exhibiting excellent rate performance (739 mAh g−1 at 5.0 C) and good cyclability (capacity decay rate is 0.033% and 0.035% per cycle at 2.0 and 5.0 C, respectively). Even a pouch cell with high sulfur loading (5.5 mg cm−2) and lean electrolyte/sulfur (4.8 µL mg−1) can still work 50 cycles with 80% capacity retention rate. This study shows far-reaching implications in the design of dendrite-free, shuttle-free Li-S batteries.
中文翻译:
具有丰富空位的量子大小的 Co 纳米颗粒实现了锂金属的均匀沉积和快速的多硫化物转化
臭名昭著的多硫化物穿梭和无法控制的锂枝晶生长是锂硫电池市场化的主要障碍。在此,提出了一种由锚定在介孔碳层 (v-Co/meso-C) 上的富含空位的量子大小的 Co 纳米点组成的双功能材料。该材料暴露了更多的活性位点以提高其反应性能,同时在 Li-S 电化学中实现了优异的亲锂性和亲硫酸性特性。作为锂金属沉积主体,v-Co/meso-C 在半晶池和对称晶池中均表现出小的成核过电位、低极化和超长循环稳定性,实验研究证实了这一点。在 S 阴极侧,实验和理论计算表明,v-Co/meso-C 增强了多硫化物的吸附并提高其催化转化率。这反过来又抑制了多硫化物的穿梭效应,提高了硫的利用效率。最后,制备了无穿梭和无树晶的 v-Co/meso-C@Li//v-Co/meso-C@S 全电池,表现出优异的倍率性能(5.0 C 时为 739 mAh g-1)和良好的循环性(在 2.0 和 5.0 C 下每个循环的容量衰减率分别为 0.033% 和 0.035%)。即使是具有高硫负载量 (5.5 mg cm-2) 和贫电解质/硫 (4.8 μL mg-1) 的软包电池仍然可以以 80% 的容量保留率工作 50 次循环。这项研究显示了对无树突、无穿梭锂硫电池设计的深远影响。
更新日期:2024-09-11
中文翻译:
具有丰富空位的量子大小的 Co 纳米颗粒实现了锂金属的均匀沉积和快速的多硫化物转化
臭名昭著的多硫化物穿梭和无法控制的锂枝晶生长是锂硫电池市场化的主要障碍。在此,提出了一种由锚定在介孔碳层 (v-Co/meso-C) 上的富含空位的量子大小的 Co 纳米点组成的双功能材料。该材料暴露了更多的活性位点以提高其反应性能,同时在 Li-S 电化学中实现了优异的亲锂性和亲硫酸性特性。作为锂金属沉积主体,v-Co/meso-C 在半晶池和对称晶池中均表现出小的成核过电位、低极化和超长循环稳定性,实验研究证实了这一点。在 S 阴极侧,实验和理论计算表明,v-Co/meso-C 增强了多硫化物的吸附并提高其催化转化率。这反过来又抑制了多硫化物的穿梭效应,提高了硫的利用效率。最后,制备了无穿梭和无树晶的 v-Co/meso-C@Li//v-Co/meso-C@S 全电池,表现出优异的倍率性能(5.0 C 时为 739 mAh g-1)和良好的循环性(在 2.0 和 5.0 C 下每个循环的容量衰减率分别为 0.033% 和 0.035%)。即使是具有高硫负载量 (5.5 mg cm-2) 和贫电解质/硫 (4.8 μL mg-1) 的软包电池仍然可以以 80% 的容量保留率工作 50 次循环。这项研究显示了对无树突、无穿梭锂硫电池设计的深远影响。