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3 D Porous CoS2 Hexadecahedron Derived from MOC toward Ultrafast and Long‐Lifespan Lithium Storage
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2018-04-20 , DOI: 10.1002/chem.201800217 Han-Chi Wang 1 , Zheng Cui 1 , Chao-Ying Fan 1 , Si-Yu Liu 1 , Yan-Hong Shi 1 , Xing-Long Wu 1 , Jing-Ping Zhang 1
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2018-04-20 , DOI: 10.1002/chem.201800217 Han-Chi Wang 1 , Zheng Cui 1 , Chao-Ying Fan 1 , Si-Yu Liu 1 , Yan-Hong Shi 1 , Xing-Long Wu 1 , Jing-Ping Zhang 1
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A new hexadecahedron assembled by core–shell CoS2 particles@N‐doped carbon (CoS2@NCH) is prepared successfully through the self‐templating method. The CoS2@NCH hybrid electrode delivers a high lithium‐storage capacity of 778 mA h g−1 after 1000 cycles at a high current density of 1 A g−1, which is the longest cycle lifespan among the reported CoS2 anode materials in lithium‐ion batteries. Furthermore, the CoS2@NCH hybrid electrode shows excellent rate capability with a discharge capacity of 220 mA h g−1 at an extremely high current density of 20 A g−1, and a charge capacity of 649 mA h g−1 is restored upon returning the current density back to 2 A g−1. The superior performance is attributed to the unique construction of CoS2@NCH. The N‐doped interconnected porous carbon shells form highly conductive skeletons for quick electron transfer and prevent the electrode from collapsing. Moreover, the porous characteristic of the materials plays a key role: as some effective channels, the mesopores on the porous carbon shells provide greater access for lithium, and the mesopores derived from the particle interspace enables the complete immersion of the electrodes in electrolyte, which alleviates the volume expansion and ensures the integrity of the electrode. In addition, the nanosized CoS2 particles, which shorten the ion‐transport path and provide extra electroactive sites, also improve the reaction kinetics.
中文翻译：
从MOC衍生的3D多孔CoS2六面体，用于超快和长寿命锂存储
通过自模板法成功制备了由核壳型CoS 2颗粒@N掺杂碳组装而成的新的十六面体（CoS 2 @NCH）。CoS 2 @NCH混合电极在1000次循环后以1 A g -1的高电流密度提供了778 mA h g -1的高锂存储容量，这是报道的锂中CoS 2阳极材料中最长的循环寿命离子电池。此外，CoS 2 @NCH混合电极在极高的电流密度20 A g -1下具有220 mA h g -1的放电容量和649 mA h g -1的充电容量，显示出极好的速率能力当电流密度恢复到2 A g -1时恢复。卓越的性能归因于CoS 2 @NCH的独特构造。N掺杂的相互连接的多孔碳壳形成高导电性骨架，可实现快速电子转移并防止电极塌陷。此外，材料的多孔特性起着关键作用：作为一些有效的通道，多孔碳壳上的中孔为锂提供了更大的通道，而源自粒子间隙的中孔使电极完全浸入电解质中，从而将其完全浸入电解质中。减轻了体积膨胀并确保了电极的完整性。此外，纳米CoS 2 可以缩短离子传输路径并提供额外电活性位点的颗粒，还可以改善反应动力学。
更新日期：2018-04-20
中文翻译：
从MOC衍生的3D多孔CoS2六面体，用于超快和长寿命锂存储
通过自模板法成功制备了由核壳型CoS 2颗粒@N掺杂碳组装而成的新的十六面体（CoS 2 @NCH）。CoS 2 @NCH混合电极在1000次循环后以1 A g -1的高电流密度提供了778 mA h g -1的高锂存储容量，这是报道的锂中CoS 2阳极材料中最长的循环寿命离子电池。此外，CoS 2 @NCH混合电极在极高的电流密度20 A g -1下具有220 mA h g -1的放电容量和649 mA h g -1的充电容量，显示出极好的速率能力当电流密度恢复到2 A g -1时恢复。卓越的性能归因于CoS 2 @NCH的独特构造。N掺杂的相互连接的多孔碳壳形成高导电性骨架，可实现快速电子转移并防止电极塌陷。此外，材料的多孔特性起着关键作用：作为一些有效的通道，多孔碳壳上的中孔为锂提供了更大的通道，而源自粒子间隙的中孔使电极完全浸入电解质中，从而将其完全浸入电解质中。减轻了体积膨胀并确保了电极的完整性。此外，纳米CoS 2 可以缩短离子传输路径并提供额外电活性位点的颗粒，还可以改善反应动力学。
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