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Facile Synthesis of Copper Sulfide Nanosheet@Graphene Oxide for the Anode of Potassium‐Ion Batteries
Energy Technology ( IF 3.6 ) Pub Date : 2019-10-03 , DOI: 10.1002/ente.201900987 Xinxin Jia 1 , Erjin Zhang 1 , Xinzhi Yu 1 , Bingan Lu 1
Energy Technology ( IF 3.6 ) Pub Date : 2019-10-03 , DOI: 10.1002/ente.201900987 Xinxin Jia 1 , Erjin Zhang 1 , Xinzhi Yu 1 , Bingan Lu 1
Affiliation
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Potassium‐ion batteries (PIBs) are promising to expedite future energy storage progress because of the low price and high energy density of potassium. Copper sulfide (CuS), a plentiful, low‐priced, and nontoxic transition metal sulfide, is going to be a promising anode material with high capacity and excellent rate performance for energy storage. Herein, thioacetamide is chosen as the sulfur source to prepare CuS nanosheets uniformly anchored on graphene oxide (CuS@GO) using a simple one‐step method. The prepared CuS@GO increases the active sites and GO effectively alleviates the polymerization of CuS during the cycling. When CuS@GO is utilized as an anode material for PIBs, it exhibits a preeminent specific capacity of 410 mAh g−1 (at a current density of 100 mA g−1) and outstanding rate capability (even achieving a higher capacity of 196.5 mAh g−1 at a current density of 1000 mA g−1). In this study, the phase evolution of CuS during the potassium‐ion insertion and extraction process is further explored by in situ X‐ray diffraction studies, which is significant to clearly understand the energy storage mechanism of CuS. A novel perspective in potassium storage mechanism for transition metal sulfides is provided.
中文翻译：
钾离子电池阳极的硫化铜纳米片@氧化石墨烯的简便合成
由于钾的价格低且能量密度高，钾离子电池（PIB）有望加快未来的储能进度。硫化铜（CuS）是一种价格低廉且无毒的过渡金属硫化物，将成为一种有前途的阳极材料，具有高容量和出色的储能速率性能。在本文中，选择硫代乙酰胺作为硫源，使用简单的一步法制备均匀地锚固在氧化石墨烯（CuS @ GO）上的CuS纳米片。所制备的CuS @ GO增加了活性位点，而GO有效地减轻了循环过程中CuS的聚合。当CuS @ GO用作PIB的阳极材料时，它的卓越比容量为410 mAh g -1（在100 mA g -1的电流密度下））和出色的速率能力（即使在1000 mA g -1的电流密度下也可以实现196.5 mAh g -1的更高容量）。在这项研究中，通过原位X射线衍射研究进一步探索了钾离子插入和萃取过程中CuS的相演化，这对于清楚地了解CuS的储能机理具有重要意义。提供了过渡金属硫化物钾储存机理的新颖观点。
更新日期：2019-10-03
中文翻译：
钾离子电池阳极的硫化铜纳米片@氧化石墨烯的简便合成
由于钾的价格低且能量密度高，钾离子电池（PIB）有望加快未来的储能进度。硫化铜（CuS）是一种价格低廉且无毒的过渡金属硫化物，将成为一种有前途的阳极材料，具有高容量和出色的储能速率性能。在本文中，选择硫代乙酰胺作为硫源，使用简单的一步法制备均匀地锚固在氧化石墨烯（CuS @ GO）上的CuS纳米片。所制备的CuS @ GO增加了活性位点，而GO有效地减轻了循环过程中CuS的聚合。当CuS @ GO用作PIB的阳极材料时，它的卓越比容量为410 mAh g -1（在100 mA g -1的电流密度下））和出色的速率能力（即使在1000 mA g -1的电流密度下也可以实现196.5 mAh g -1的更高容量）。在这项研究中，通过原位X射线衍射研究进一步探索了钾离子插入和萃取过程中CuS的相演化，这对于清楚地了解CuS的储能机理具有重要意义。提供了过渡金属硫化物钾储存机理的新颖观点。
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