Construction of conductive PTh-promoted NaTi2(PO4)3 nanocomposite with two-electron reactions for sodium energy storage

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2024-07-19 DOI:10.1016/j.ssi.2024.116643

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Abstract

As a new negative material for sodium-ion batteries, NaTi₂(PO₄)₃ has received great attention because of its excellent safety, abundant natural resources, low toxicity and two-electron reactions. However, the pure NaTi₂(PO₄)₃ anode material displays a bad conductivity, resulting in an inferior electrochemical performance for sodium energy storage. In this work, we introduce a good route to fabricate the conductive PTh-promoted NaTi₂(PO₄)₃ (NaTi₂(PO₄)₃@PTh) composite with superior rate property and superior cycle stability for the first time. In this fabricated material, the conductive PTh layer has been successfully coated on the NaTi₂(PO₄)₃ nanoparticles. Compared to NaTi₂(PO₄)₃, the prepared NaTi₂(PO₄)₃@PTh anode possesses better cycle stability and higher capacity. It shows the capacity of 129.5 mAh g⁻¹ at 0.1C and presents the high capacity retention of around 98.3% at 10C over 300 cycles. Therefore, this fabricated NaTi₂(PO₄)₃@PTh nanocomposite can be employed as the novel negative electrode in sodium-ion storage.

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利用双电子反应构建导电的 PTh 促进 NaTi2(PO4)3 纳米复合材料，用于钠储能

作为钠离子电池的新型负极材料，NaTi2(PO4)3 因其极佳的安全性、丰富的自然资源、低毒性和双电子反应而备受关注。然而，纯 NaTi2(PO4)3 负极材料的电导率较低，导致钠储能的电化学性能较差。在这项工作中，我们首次提出了一条良好的路线来制备导电的 PTh 促进 NaTi2(PO4)3 （NaTi2(PO4)3@PTh）复合材料，该材料具有优异的速率特性和循环稳定性。在这种制备的材料中，导电 PTh 层已成功涂覆在 NaTi2(PO4)3 纳米颗粒上。与 NaTi2(PO4)3 相比，制备的 NaTi2(PO4)3@PTh 阳极具有更好的循环稳定性和更高的容量。它在 0.1C 时的容量为 129.5 mAh g-1，在 10C 时的容量保持率高达 98.3%，循环 300 次以上。因此，这种制备的 NaTi2(PO4)3@PTh 纳米复合材料可用作钠离子存储的新型负极。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.