Facile fabrication of a high performance TiNb2O7 anode for large-scale electrical energy storage,Journal of Materials Chemistry A

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Facile fabrication of a high performance TiNb2O7 anode for large-scale electrical energy storage
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-08-01 , DOI: 10.1039/d2ta03995h
Li-Qian Cheng ₁ , Yijuan He ₁ , Kai Chen ₂ , Zhenhua Ma ₁ , Ruiping Liu ₁ , Na Liu ₂ , Yichen Deng ₂

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The titanium niobium oxide (TiNb₂O₇) material is synthesized by a facile two-step solid-state calcination (denoted as 2ndTNO). The 2ndTNO delivers a high reversible discharge capacity of 288 mA h g⁻¹ at 0.1C, good rate performances at 1C–5C, and an excellent capacity retention of 85.4% after 500 cycles at 1C/1C (with a discharge capacity of 195.5 mA h g⁻¹ after 500 cycles). Large-size 40 Ah LFP/TNO pouch type batteries are also assembled and exhibit excellent cycling stabilities. The enhancement in electrochemical properties of 2ndTNO is mainly attributed to the generation of oxygen vacancies during the second calcination, which increases the electronic conductivity via charge redistribution and atom reduction to lower valence states (Nb⁴⁺ and Ti³⁺). The two-step calcination is a promising method for mass production of high-performance oxide electrode materials.

中文翻译：

用于大规模电能存储的高性能 TiNb2O7 阳极的简易制造

钛铌氧化物（TiNb ₂ O ₇）材料通过简便的两步固态煅烧（记为2ndTNO）合成。2ndTNO 在 0.1C 下具有 288 mA hg ^-1的高可逆放电容量，在 1C-5C 下具有良好的倍率性能，在 1C/1C 下 500 次循环后具有 85.4% 的出色容量保持率（放电容量为 195.5 mA hg ^-1 500 次循环后）。还组装了大尺寸 40 Ah LFP/TNO 袋式电池，表现出出色的循环稳定性。2ndTNO 电化学性能的增强主要归因于第二次煅烧过程中氧空位的产生，从而增加了电子电导率电荷再分配和原子还原到较低价态（Nb ⁴⁺和 Ti ³⁺）。两步煅烧是大规模生产高性能氧化物电极材料的一种很有前景的方法。

更新日期：2022-08-01

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