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调节MnO₂中介层H⁺迁移,通过W和K共工程调节高容量水性离子电池

Guodong Miao¹, Zhen Wang¹, Feng Sun¹

¹Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, PR China.

Journal of colloid and interface science

|April 23, 2025

概括

和联合合的二氧化 (WKMO) 通过改善离子运输和减少副产品的形成来增强水性离子电池 (AZIB). 这导致长期使用的AZIB具有更高的能量密度和周期寿命.

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:

二氧化 (MnO2) 是高能量密度水性离子电池 (AZIB) 的关键阴极材料.
电解质的pH值变化和MnO2中"死"的H+离子被捕获导致放电副产品 (ZSH) 沉,阻碍了电池的性能.
现有的 MnO2 阴极由于 ZSH 积累而导致循环稳定性和速率能力不佳.

研究的目的:

为AZIBs开发一种基于MnO2的新型阴极材料,克服ZSH沉积的局限性.
为了提高电化学活性,速度性能和MnO2阴极的长期循环稳定性.
调查 (W) 和 (K) 联合兴奋剂对MnO2属性的协同效应.

主要方法:

将MnO2与 (W) 和 (K) 联合化,以创建WKMO阴极材料.
电化学表征包括速率性能和长期循环测试.
物理和化学分析以阐明反应机制和结构稳定性.

主要成果:

WKMO对H+插入/提取的阻力显著降低,并在晶格内增强了H+迁移.
联合兴奋剂有效地减轻ZSH沉积,在延长循环期间保持电池性能.
WKMO表现出异常的速率性能 (150mAhg-1在5Ag-1时) 和长期循环稳定性 (238mAhg-1在1000个循环后在1Ag-1时),比未使用的MnO2显著改善.

结论:

和的联合兴奋剂是一种可行的策略,可以提高AZIB中的MnO2阴极的性能.
W和K的协同效应改善了离子动力学,结构稳定性和导电性,从而产生了优越的电化学性能.
这种多元件调制方法为开发高性能,寿命长的离子电池提供了有希望的途径.

关键词:

水性离子电池的水性离子电池 H(+) 迁移的情况.在 MnO(2) 阴极上氧气缺陷是一种缺陷.在W和K的联合兴奋剂中,W和K联合兴奋剂.

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