New Mechanistic Insights on Na-Ion Storage in Nongraphitizable Carbon
New Mechanistic Insights on Na-Ion Storage in Nongraphitizable Carbon
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DOI：
10.1021/acs.nanolett.5b01969
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发表时间：
2015-09-01
期刊：
影响因子：
10.8
通讯作者：
Ji, Xiulei
中科院分区：
文献类型：
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作者：
Bommier, Clement;Surta, Todd Wesley;Ji, Xiulei
非石墨化碳，也称为硬碳，被认为是新兴的钠离子电池最有前途的阳极之一。目前对硬碳中Na离子储存的机理理解是基于21世纪初首次提出的“卡片屋”模型。该模型描述了Na离子插入首先通过在乱层纳米畴中的石墨烯片之间的插入发生，然后通过Na填充碳结构中的孔。我们试图通过调整乱层纳米畴的尺寸来测试该模型，但揭示了结构缺陷和Na离子存储之间的相关性。根据我们的实验数据，我们提出了一个替代的观点钠化的硬碳，包括钠离子存储在缺陷的网站，插层和最后通过孔隙填充。
Nongraphitizable carbon, also known as hard carbon, is considered one of the most promising anodes for the emerging Na-ion batteries. The current mechanistic understanding of Na-ion storage in hard carbon is based on the "card-house" model first raised in the early 2000s. This model describes that Na-ion insertion occurs first through intercalation between graphene sheets in turbostratic nanodomains, followed by Na filling of the pores in the carbon structure. We tried to test this model by tuning the sizes of turbostratic nanodomains but revealed a correlation between the structural defects and Na-ion storage. Based on our experimental data, we propose an alternative perspective for sodiation of hard carbon that consists of Na-ion storage at defect sites, by intercalation and last via pore-filling.