Sodium‐ion batteries (SIBs), which are being considered as possible alternatives to lithium‐ion batteries, have attracted great scientific and industrial interest because sodium is inexpensive and more abundant than lithium. Among various anode materials for SIBs, Na₂Ti₃O₇, with a layered structure, has a high potential due to its stable electrochemical sodiation/desodiation behavior. However, Na₂Ti₃O₇ has a large band‐gap energy and a zigzag framework, which results in low electrical conductivity and poor sodium‐ion diffusion. Thus, to circumvent such drawbacks, in this study, Na₂Ti₃O₇ was successfully exfoliated by the soft‐chemical exfoliation technique via a two‐step intercalation reaction. Transmission electron microscopy (TEM) studies show that the obtained exfoliated material is composed of thin nanosheets. Electrochemical sodium‐ion storage tests showed that the exfoliated nanosheets had a much higher discharge capacity than bare bulk Na₂Ti₃O₇, revealing that the exfoliation process could be utilized to develop new electrode materials with enhanced energy‐storage properties.

中文翻译：

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Na2Ti3O7剥离成具有增强放电容量的胶体纳米片

钠离子电池（SIB）被认为是锂离子电池的可能替代品，由于钠比锂便宜且含量更高，因此引起了极大的科学和工业兴趣。在用于SIB的各种阳极材料中，具有层状结构的Na ₂ Ti ₃ O ₇由于其稳定的电化学钠化/脱氮行为而具有高电势。但是，Na ₂ Ti ₃ O ₇具有较大的带隙能和锯齿形的骨架，导致电导率低和钠离子扩散差。因此，为避免此类缺陷，本研究中使用了Na ₂ Ti ₃ O ₇软化学剥离技术通过两步插层反应成功剥离了角质层。透射电子显微镜（TEM）研究表明，获得的剥离材料由纳米薄片组成。电化学钠离子存储测试表明，剥落的纳米片比裸露的Na ₂ Ti ₃ O ₇具有更高的放电容量，表明剥落过程可用于开发具有增强的储能性能的新型电极材料。