通过对高压离子电池的Mg/Cr联合剂增强结构稳定性
Xiaoqian Xu1,2, Sijiang Hu1, Qichang Pan1
1Guangxi Key Laboratory of Low Carbon Energy Materials, Guangxi New Energy Ship Battery Engineering Technology Research Center, Guangxi Scientific and Technological Achievements Transformation Pilot Research Base of Electrochemical Energy Materials and Devices, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China.
Small (Weinheim an der Bergstrasse, Germany)
|November 8, 2023
概括
研究人员开发了一种用于离子电池的新型共P2-NaNMCM材料. 这种材料增强了结构稳定性和容量保留,克服了高压阴极性能方面的挑战.
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:
- P2-Na2/3Ni1/3Mn2/3O2 (P2-NaNM) 阴极材料为离子电池提供高电压和氧化还原能力.
- 这些材料在深度循环过程中遭受氧气演变和相变的结构不稳定.
- 这种不稳定性限制了它们在高能量密度离子电池中的实际应用.
研究的目的:
- 为离子电池开发稳定高性能P2-NaNM阴极材料.
- 研究使用 (Cr) 和 (Mg) 增强结构完整性和电化学性能的联合兴奋剂策略.
- 了解提高稳定性和性能背后的机制.
主要方法:
- 一步合成Cr,Mg联合合P2-NaNMCM材料. 一步合成Cr,Mg联合合P2-NaNMCM材料.
- 电化学性能测试,包括100个循环在1°C的循环稳定性.
- 现场X射线衍射 (XRD) 和现场拉曼光谱分析循环过程中的结构变化.
- 外置X射线光电子光谱 (XPS) 用于研究表面化学和粘合.
主要成果:
- 与P2-NaNMCM-0.01一起合的材料在1C的100个循环后实现了82%的容量保留.
- 胺兴奋剂提供了"支柱效应",抑制了有害的P2-O2相位过渡,并增强了Na+迁移.
- doping形成了强大的TM-O键,有效地阻止了深充电期间的晶格氧气演变.
结论:
- 与Cr和Mg联合合是一种高效的策略,用于稳定离子电池中的P2层氧化物阴极.
- 双功能改进减轻了结构退化,提高了电化学性能,使得高工作电压和能量密度.
- 这项工作为设计下一代离子能量存储的先进阴极材料提供了一个有前途的方法.
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