氧缺陷和Cl-化调制TiNb2O7化合物在离子电池中具有高速性能

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Published on: November 11, 2013

Pei Cui¹, Panpan Zhang¹, Xueli Chen¹

¹School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.

ACS applied materials & interfaces

|September 11, 2023

概括

兴奋剂和氧气空缺增强氧化 (TiNb2O7) 离子电池的阳极材料. 这提高了离子和电子导电性,提高了高速率应用的性能.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
电池技术电池技术

背景情况:

氧化和 (TiNb2O7) 是离子电池的一个有前途的阳极材料,由于其高容量和安全性.
低离子和电子导电性限制了TiNb2O7的实际应用,特别是在高速率电池中.
制定增强离子/电子传输的策略对于推进基于TiNb2O7的能量储存至关重要.

研究的目的:

为了提高TiNb2O7.7的离子和电子导电性.
研究兴奋剂和氧气空置工程对TiNb2O7电化学性能的影响.
探索改性TiNb2O7作为离子电池的高性能阳极材料的潜力.

主要方法:

一种简单的固体相方法,使用化 (NH4Cl) 进行兴奋剂和氧气空缺的产生.
瑞特维尔德精炼分析晶体结构并确认氧气位点中的替代.
密度函数理论 (DFT) 计算用于研究电子结构修改和电荷补偿机制.

主要成果:

在TiNb2O7中成功地引入了兴奋剂和氧气空缺,由Rietveld精炼证实.
由于离子传输的改善,Li+扩散系数从2.39 × 10^-14提高到1.50 × 10^-13 cm2/s.
修改后的TiNb2O7表现出金属性质和优越的速率性能,在50°C下达到172.82 mAh g−1的功率.

结论:

同时的兴奋剂和氧空缺工程有效地提高了TiNb2O7.7的电化学性能.
这些修改优化了能量带和晶体结构,从而改善了离子/电子传输和更高的容量.
这种方法为设计高速离子电池的先进阳极材料提供了可行的策略.

关键词:

用进行兴奋剂.高速能力能力的高率能力.有空缺的氧气位.氧化和的氧化物.

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