New Mechanistic Insights on Na-Ion Storage in Nongraphitizable Carbon,Nano Letters

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New Mechanistic Insights on Na-Ion Storage in Nongraphitizable Carbon
Nano Letters ( IF 9.6 ) Pub Date : 2015-08-05 00:00:00 , DOI: 10.1021/acs.nanolett.5b01969
Clement Bommier ₁ , Todd Wesley Surta ₁ , Michelle Dolgos ₁ , Xiulei Ji ₁

Affiliation

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.

中文翻译：

不可石墨化碳中钠离子存储的新机制

不可石墨化的碳，也称为硬碳，被认为是新兴的Na离子电池最有希望的阳极之一。目前对硬碳中Na离子存储的机械理解是基于2000年代初首次提出的“卡片纸屋”模型。该模型描述了Na离子的插入首先是通过在层状纳米域中的石墨烯片之间插入而发生的，然后是Na填充碳结构中的孔。我们试图通过调整涡轮层纳米域的尺寸来测试该模型，但揭示了结构缺陷与Na离子存储之间的相关性。根据我们的实验数据，我们提出了另一种硬碳沉积的替代方法，该方法包括通过插入和最后通过孔隙填充将Na离子存储在缺陷部位。

更新日期：2015-08-05

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