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Hierarchically Structured Nitrogen-Doped Carbon Microspheres for Advanced Potassium Ion Batteries
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-06-17 , DOI: 10.1021/acsmaterialslett.0c00171 Junmin Ge 1 , Bin Wang 2 , Jiang Zhou 3, 4 , Shuquan Liang 3, 4 , Apparao M. Rao 5 , Bingan Lu 1, 6
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-06-17 , DOI: 10.1021/acsmaterialslett.0c00171 Junmin Ge 1 , Bin Wang 2 , Jiang Zhou 3, 4 , Shuquan Liang 3, 4 , Apparao M. Rao 5 , Bingan Lu 1, 6
Affiliation
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Because of their unique properties, microstructured carbons have received widespread attention in various fields, such as energy storage, medicine, and biosensors. In this study, hierarchically structured nitrogen-doped carbon microspheres (CMSs) are synthesized for use as electrodes in a potassium ion battery (PIBs). Compared to traditional carbon nanomaterials, the CMSs possess rich internal structure, which not only provide additional active sites and better electron transport but also mitigate the volume expansion related challenges caused by potassium ion intercalation. As the anode material for PIBs, the CMSs could deliver high reversible discharge capacities of 328 and 125 mAh g–1 at 100 and 3000 mA g–1, respectively. Moreover, the CMSs anodes also exhibit durable cycling performance with a remaining capacity of 136 mAh g–1 even after 10000 cycles at a high current density of 2000 mA g–1. Notably, a full cell assembled with the CMSs anode and an organic cathode exhibits excellent electrochemical characteristics with 78% capacity retention after 1900 cycles at 500 mA g–1, and high energy and power densities of 141Wh kg–1 and 4382 W kg–1, respectively. Considering the rich microstructure of CMSs and their facile synthesis method, this study delineates the merits of employing CMSs in battery applications over other electrode materials.
中文翻译：
用于高级钾离子电池的分层结构氮掺杂碳微球
由于其独特的性能，微结构碳已在能量存储，医学和生物传感器等各个领域受到广泛关注。在这项研究中，合成了分层结构的氮掺杂碳微球（CMS），用作钾离子电池（PIB）中的电极。与传统的碳纳米材料相比，CMS具有丰富的内部结构，不仅提供了更多的活性位点和更好的电子传输，还减轻了因钾离子嵌入而引起的体积膨胀相关挑战。作为PIB的阳极材料，CMS在100和3000 mA g –1时可提供328和125 mAh g –1的高可逆放电容量， 分别。此外，CMS的阳极也表现出与136毫安g的剩余容量耐久循环性能-1即使在2000毫安g的高电流密度下10000次循环-1。值得注意的是，由CMSs阳极和有机阴极组装而成的全电池具有出色的电化学特性，在500 mA g –1的1900次循环后，容量保持率达78％，高能量和功率密度分别为141Wh kg –1和4382 W kg –1， 分别。考虑到CMS的丰富微观结构及其简便的合成方法，本研究描述了在电池应用中使用CMS优于其他电极材料的优点。
更新日期：2020-07-06
中文翻译：
用于高级钾离子电池的分层结构氮掺杂碳微球
由于其独特的性能，微结构碳已在能量存储，医学和生物传感器等各个领域受到广泛关注。在这项研究中，合成了分层结构的氮掺杂碳微球（CMS），用作钾离子电池（PIB）中的电极。与传统的碳纳米材料相比，CMS具有丰富的内部结构，不仅提供了更多的活性位点和更好的电子传输，还减轻了因钾离子嵌入而引起的体积膨胀相关挑战。作为PIB的阳极材料，CMS在100和3000 mA g –1时可提供328和125 mAh g –1的高可逆放电容量， 分别。此外，CMS的阳极也表现出与136毫安g的剩余容量耐久循环性能-1即使在2000毫安g的高电流密度下10000次循环-1。值得注意的是，由CMSs阳极和有机阴极组装而成的全电池具有出色的电化学特性，在500 mA g –1的1900次循环后，容量保持率达78％，高能量和功率密度分别为141Wh kg –1和4382 W kg –1， 分别。考虑到CMS的丰富微观结构及其简便的合成方法，本研究描述了在电池应用中使用CMS优于其他电极材料的优点。
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