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在P2型分层氧化物阴极中通过对离子电池的协同/兴奋剂实现稳定的循环性能

Tiancheng Dong¹, Xinlei Tang¹, Muhammad Mudassir Hassan¹

¹State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, People's Republic of China.

ACS applied materials & interfaces

|August 26, 2024

概括

这项研究通过在层层的过渡金属氧化物中使用和编码对离子电池 (SIB) 进行增强. 这一策略激活了阳离子氧化还原反应,提高了SIB阴极的能量密度和稳定性.

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
储能储能储能储能储能储能

背景情况:

离子电池 (SIB) 对储能充满希望.
分层过渡金属氧化物是潜在的SIB阴极材料.
对于先进的SIB应用,需要更高的能量密度.

研究的目的:

通过激活离子氧化还原反应 (ARRs) 来提高SIB的能量密度.
为了研究和对Na_0.75Ni_0.3Mn_0.7O₂阴极的合作用.
为了提高ARR和电化学性能的可逆性.

主要方法:

合成和Zn的代号为Na_0.75Ni_0.3Mn_0.7O₂. 这两种代号的合成方法
电极性能 (容量,速度,循环稳定性) 的电化学测试.
密度函数理论 (DFT) 计算,以了解对ARRs的兴奋剂效应.

主要成果:

Na_0.75Li_0.15Ni_0.1Zn_0.05Mn_0.7O₂在100 mA g^{-1时实现了134 mA hg-1的放电能力.}
在200个循环中,经过密封的材料表现出极好的循环稳定性,没有显著的容量损失.
DFT计算证实,与单元兴奋剂相比,配合兴奋剂会增加ARR.

结论:

协同的Li和Zn配合有效地激活了SIB层氧化物中的ARRs.
双离子兴奋剂通过减轻相位过渡来提高速率容量和周期稳定性.
这种配合策略为设计高能量密度SIB阴极提供了一条新的途径.

关键词:

这是一种P2型层状氧化物.阳离子氧化还原反应是阳离子还原反应.阴极是天主体,它们是天主体.codoping 策略的使用方法离子电池和离子电池的电池

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