Construction of Kinetics Pathways in Lithium Titanate Composite Material to Quickly Store Sodium Ion for the Dual-Ion Batteries,ACS Applied Energy Materials

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Construction of Kinetics Pathways in Lithium Titanate Composite Material to Quickly Store Sodium Ion for the Dual-Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-06 00:00:00 , DOI: 10.1021/acsaem.0c00946
Chao Li ₁ , Zhike Li _{1,

2} , Yangcai He ₁ , Hongyu Wang ₂ , Yongjun Xu ₁

Affiliation

High rate storage of sodium ions in lithium titanate still stay unsolved, although the sodium as a medium in such materials can reduce the voltage platform and enhance the high energy density of electrochemical batteries. Herein, the composite lithium titanate/carbon nanotube materials are synthesized to improve the kinetics process by designing pathways to migrate the electrons and ions. A special micro-nanomaterial comprises many micropores/mesopores formed from nanoparticles of lithium titanate and slender carbon nanotubes with a natural curvature style. Thus, it significantly decreases the kinetics barriers and electrochemical impedance under the charge of a high rate. It is used as sodium-based dual-ion batteries and displays the excellent electrochemical performance, such as a wide voltage window (about 1–4.6 V), a long cycling stability (∼148 mAh g^–1 after 500 cycles), and an outstanding rate capability (∼102 mAh g^–1 at 20 C). Our works demonstrate that a high rate capability may be enabled by a facile design of dual-ion batteries, which avoid the long-term difficulty of sodium-ion batteries and present new opportunities of high-power battery devices.

中文翻译：

钛酸锂复合材料动力学路径的构建以快速存储双离子电池的钠离子

钛酸锂中钠离子的高速率存储仍未解决，尽管作为这种材料中的钠可以降低电压平台并提高电化学电池的高能量密度。在此，合成钛酸锂/碳纳米管复合材料通过设计迁移电子和离子的途径来改善动力学过程。一种特殊的微纳米材料包括许多由钛酸锂的纳米颗粒和具有自然曲率样式的细长碳纳米管形成的微孔/中孔。因此，它在高速率下显着降低了动力学势垒和电化学阻抗。它用作钠基双离子电池，并具有出色的电化学性能，例如宽电压范围（约1–4.6 V），500次循环后为^–1）和出色的速率能力（20 C时约为102 mAh g ^–1）。我们的工作表明，双离子电池的便捷设计可以实现高倍率性能，从而避免了钠离子电池的长期困难，并为大功率电池设备带来了新的机遇。

更新日期：2020-07-06

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