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A pairwise/sandwich-like assembly consisting of a TaO3 nanomesh and reduced graphene oxide for a pelletized self-supported cathode towards high-areal-capacity Li–S batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-11-14 , DOI: 10.1039/d2ta07139h Chenhui Wang 1 , Nobuyuki Sakai 1 , Yasuo Ebina 1 , Shigeru Suehara 1 , Takayuki Kikuchi 1 , Daiming Tang 1 , Renzhi Ma 1 , Takayoshi Sasaki 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-11-14 , DOI: 10.1039/d2ta07139h Chenhui Wang 1 , Nobuyuki Sakai 1 , Yasuo Ebina 1 , Shigeru Suehara 1 , Takayuki Kikuchi 1 , Daiming Tang 1 , Renzhi Ma 1 , Takayoshi Sasaki 1
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Lithium–sulfur (Li–S) batteries have attracted considerable attention as a promising energy storage technology. However, the low loading and utilization of sulfur result in the poor practical energy density of these batteries, which has hindered their extensive application. Herein, we demonstrate the fabrication of a molecular pairwise/sandwich-like assembly of TaO3/rGO, which can be pelletized into a self-supported cathode to improve sulfur loading and utilization. This unique pairwise/sandwich-like heterostructure of TaO3/rGO was produced through a solution process via self-assembly and identified by X-ray diffraction analysis/simulation and TEM observations. The molecular-scale heterostructure maximizes attractive features of the TaO3 nanomesh: crystalline open channels, polar Ta–O bonds, Lewis acid surfaces and largely exposed active sites, by combining with electrically conductive rGO. As a result, the heterostructure exhibited fast Li+ transfer, effective confinement of polysulfides and high catalytic activity for the conversion of lithium polysulfides and uniform deposition of Li2S, thereby contributing to high sulfur utilization. Consequently, the Li–S batteries assembled with these self-supported cathodes achieved a high areal capacity of 10.5 mA h cm−2 at 2 mA cm−2. This versatile strategy of fabricating electrodes with a high loading of powder-like active materials can be applied to various energy storage systems, such as alkali metal batteries, promoting their practical application.
中文翻译：
由 TaO3 纳米网和还原氧化石墨烯组成的成对/三明治状组件，用于用于高面积容量 Li-S 电池的球状自支撑阴极
锂硫（Li-S）电池作为一种有前途的储能技术引起了人们的广泛关注。然而，硫的低负载和利用率导致这些电池的实用能量密度较差，阻碍了它们的广泛应用。在此，我们展示了 TaO 3 /rGO的分子对/三明治状组装的制造，它可以被造粒成自支撑阴极以提高硫负载和利用率。这种独特的 TaO 3 /rGO成对/三明治状异质结构是通过自组装的溶液过程产生的，并通过 X 射线衍射分析/模拟和 TEM 观察进行了鉴定。分子级异质结构最大限度地发挥了 TaO 3的吸引人的特征nanomesh：通过与导电 rGO 结合，结晶开放通道、极性 Ta-O 键、路易斯酸表面和大量暴露的活性位点。因此，该异质结构表现出快速的 Li +转移、对多硫化物的有效限制以及对多硫化锂转化和 Li 2 S 均匀沉积的高催化活性，从而有助于提高硫的利用率。因此，用这些自支撑正极组装的锂硫电池在 2 mA cm -2下实现了 10.5 mA h cm -2的高面积容量. 这种用高负载量的粉末状活性材料制造电极的通用策略可以应用于各种储能系统，如碱金属电池，促进其实际应用。
更新日期：2022-11-14
中文翻译：
由 TaO3 纳米网和还原氧化石墨烯组成的成对/三明治状组件，用于用于高面积容量 Li-S 电池的球状自支撑阴极
锂硫（Li-S）电池作为一种有前途的储能技术引起了人们的广泛关注。然而，硫的低负载和利用率导致这些电池的实用能量密度较差，阻碍了它们的广泛应用。在此，我们展示了 TaO 3 /rGO的分子对/三明治状组装的制造，它可以被造粒成自支撑阴极以提高硫负载和利用率。这种独特的 TaO 3 /rGO成对/三明治状异质结构是通过自组装的溶液过程产生的，并通过 X 射线衍射分析/模拟和 TEM 观察进行了鉴定。分子级异质结构最大限度地发挥了 TaO 3的吸引人的特征nanomesh：通过与导电 rGO 结合，结晶开放通道、极性 Ta-O 键、路易斯酸表面和大量暴露的活性位点。因此，该异质结构表现出快速的 Li +转移、对多硫化物的有效限制以及对多硫化锂转化和 Li 2 S 均匀沉积的高催化活性，从而有助于提高硫的利用率。因此，用这些自支撑正极组装的锂硫电池在 2 mA cm -2下实现了 10.5 mA h cm -2的高面积容量. 这种用高负载量的粉末状活性材料制造电极的通用策略可以应用于各种储能系统，如碱金属电池，促进其实际应用。
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