Amorphous TiO2/C Frameworks as Intercalation Pseudocapacitance Anodes for Fast and Durable Sodium Storage,Energy & Fuels

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Amorphous TiO2/C Frameworks as Intercalation Pseudocapacitance Anodes for Fast and Durable Sodium Storage
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-09-23 , DOI: 10.1021/acs.energyfuels.0c02820
Hui Xu ₁ , Genxi Yu ₂ , Weijuan Wang ₂ , Liguang Qin ₂ , Luohan Ren ₁ , Yaqin Jiang ₁

Affiliation

High rate and long-life sodium-ion batteries (SIBs) are highly desirable for stationary energy storage applications. However, the practical implementations of SIBs are strictly restricted due to the shortage of satisfactory anode materials. In this study, a Fe and N co-doped amorphous TiO₂/C composite synthesized by an MOF-derived approach fulfills the demands of kinetics and durability by stimulating intercalation pseudocapacitance. Unlike traditional crystalline materials whose pseudocapacitance behaviors are highly dependent on the surface area and the crystal structure, the amorphous TiO₂/C composite shows fast Na⁺ intercalation/deintercalation independent of the surface area, and it can deliver impressive capacities, decent rate capability, and excellent cyclability. The electrochemical analysis shows that intercalation pseudocapacitance is responsible for the prominent sodium storage performance of the amorphous TiO₂/C composite. This work demonstrates that Na⁺ intercalation can be realized in amorphous structures and is beneficial for the development of extrinsic pseudocapacitive materials.

中文翻译：

非晶TiO ₂ / C骨架作为插入式伪电容阳极，用于快速持久的钠存储

高速率和长寿命的钠离子电池（SIB）非常适合固定式储能应用。然而，由于缺少令人满意的阳极材料，SIB的实际实施受到严格限制。在这项研究中，通过MOF衍生的方法合成的Fe和N共掺杂的非晶TiO ₂ / C复合材料通过刺激插层拟电容来满足动力学和耐久性的要求。与传统的晶体材料（其假电容行为高度依赖于表面积和晶体结构）不同，非晶态TiO ₂ / C复合材料显示出快速的Na ⁺嵌入/脱嵌不受表面面积的影响，并且可以提供令人印象深刻的容量，良好的速率处理能力和出色的可循环性。电化学分析表明，插层拟电容是非晶TiO ₂ / C复合材料显着的钠存储性能的原因。这项工作表明，Na ⁺嵌入可以在非晶结构中实现，并且有利于非本征伪电容材料的开发。

更新日期：2020-10-16

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