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In Situ Sulfurized Carbon-Confined Cobalt for Long-Life Mg/S Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-10 , DOI: 10.1021/acsaem.9b02232 Ju Sun 1 , Chen Deng 1 , Yujing Bi 2 , Kuang-Hsu Wu 1 , Shenmin Zhu 3 , Zhirun Xie 1 , Chilin Li 4 , Rose Amal 1 , Jian Luo 2 , Tianbiao Liu 2 , Da-Wei Wang 1, 5
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-10 , DOI: 10.1021/acsaem.9b02232 Ju Sun 1 , Chen Deng 1 , Yujing Bi 2 , Kuang-Hsu Wu 1 , Shenmin Zhu 3 , Zhirun Xie 1 , Chilin Li 4 , Rose Amal 1 , Jian Luo 2 , Tianbiao Liu 2 , Da-Wei Wang 1, 5
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Magnesium (Mg) batteries have attracted growing attention because of their low cost and high volumetric capacity. Mg/S batteries are of particular interest because of the high capacities of Mg and sulfur, which cooperatively enable high energy densities. However, the shuttling polysulfides during the S0/S2– conversion impair the cathode stability and corrode the Mg anode. This work reports the in situ sulfurization of carbon-confined cobalt in a mesoporous matrix (MesoCo@C) through sulfur melt impregnation and its effectiveness in uplifting the cathode stability and alleviating the Mg anode corrosion (i.e., formation of magnesium sulfides/sulfates). The CoSx species play important roles in binding with polysulfides and regulating the notorious polysulfide shuttle. Both the carbon matrix and the preserved cobalt are excellent electron conductors and allow fast charge transfer to the CoSx species, which become the active sites that facilitate the interaction with magnesium polysulfides and improve the cathode kinetics. These combined effects collectively give rise to the stable capacity of 280 mAh/g at 0.2 C (1 C = 1675 mA/g) for at least 400 cycles.
中文翻译：
长寿命Mg / S电池的原位硫化碳限制钴
镁（Mg）电池因其低成本和高容量而备受关注。Mg / S电池特别受关注，因为Mg和硫的高容量可协同实现高能量密度。但是，在S 0 / S 2–转化过程中穿梭的多硫化物会损害阴极稳定性并腐蚀Mg阳极。这项工作报道了通过硫熔体浸渍法在中孔基质（MesoCo @ C）中对含碳钴进行的原位硫化及其在提高阴极稳定性和减轻镁阳极腐蚀（即形成硫化镁/硫酸镁）方面的有效性。CoS x物种在与多硫化物结合和调节臭名昭著的多硫化物穿梭中起重要作用。碳基体和保留的钴都是极好的电子导体，并允许将电荷快速转移到CoS x物种，而CoS x物种成为促进与多硫化镁相互作用并改善阴极动力学的活性位点。这些综合作用共同产生了在至少200个循环中于0.2 C（1 C = 1675 mA / g）时稳定的容量280 mAh / g。
更新日期：2020-01-10
中文翻译：
长寿命Mg / S电池的原位硫化碳限制钴
镁（Mg）电池因其低成本和高容量而备受关注。Mg / S电池特别受关注，因为Mg和硫的高容量可协同实现高能量密度。但是，在S 0 / S 2–转化过程中穿梭的多硫化物会损害阴极稳定性并腐蚀Mg阳极。这项工作报道了通过硫熔体浸渍法在中孔基质（MesoCo @ C）中对含碳钴进行的原位硫化及其在提高阴极稳定性和减轻镁阳极腐蚀（即形成硫化镁/硫酸镁）方面的有效性。CoS x物种在与多硫化物结合和调节臭名昭著的多硫化物穿梭中起重要作用。碳基体和保留的钴都是极好的电子导体，并允许将电荷快速转移到CoS x物种，而CoS x物种成为促进与多硫化镁相互作用并改善阴极动力学的活性位点。这些综合作用共同产生了在至少200个循环中于0.2 C（1 C = 1675 mA / g）时稳定的容量280 mAh / g。
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