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氧缺陷和Cl-化调制TiNb2O7化合物在离子电池中具有高速性能

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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