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通过N表面兴奋剂共同提高丰富的基阴极材料的阳离子-离子氧化逆转率

Xinrui Liu¹, Qing Zhang¹, Jiahao Ji¹

¹School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China.

ACS applied materials & interfaces

|July 18, 2024

概括

兴奋剂通过改善离子扩散和结构稳定性来增强丰富的基层氧化物 (LRMO) 阴极材料. 这导致了高能量密度可充电电池的优越电化学性能.

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
储能储能储能储能储能储能

背景情况:

富基层氧化物 (LRMO) 是高能量密度电池的有希望的阴极材料,因为它们的高特异性容量和成本效益.
然而,LRMO患有氧气释放,缓慢的Li+扩散和过渡金属离子迁移等问题,导致结构退化和容量衰减.

研究的目的:

研究 (N) 兴奋剂对LRMO阴极材料电化学性能的影响.
为了提高阴离子-离子氧化还原反应的可逆性,并改善可充电电池的LRMO的稳定性.

主要方法:

通过处理含有氧气空隙的Li1.16Ni0.21Mn0.63O2-δ (LNMO) 颗粒来合成N-化LRMO (LNMO-N).
使用密度函数理论 (DFT) 计算和实验分析来研究结构和电化学特性.
评估了电化学性能,包括特定容量,库伦比效率,速率能力和循环稳定性.

主要成果:

被N-doped的LNMO-N样本显示了N-doping,减少的Mn/Ni离子和表面氧空缺.
DFT的计算和实验证实,胺降低了扩散能障碍,增强了Li+动力学和过渡金属离子迁移的可逆性.
LNMO-N显示出较好的阴离子-离子氧化还原反应可逆性,在20 mA g-1下达到296.6 mAh g-1的高排放特异容量,初始库伦比效率为85.9%.
该材料在200个周期内表现出了出色的速率能力 (215.1 mAh g-1 在200 mA g-1 上) 和在高电流密度下持续的性能 (141.4 mAh g-1 在1000 mA g-1 上).

结论:

兴奋剂是一种有效的策略,可以提高LRMO阴极材料的电化学性能和结构稳定性.
增强的特性归因于改善的Li+扩散,可逆的过渡金属迁移,以及由N兴奋剂诱导的更灵活的结构.
LNMO-N为下一代高能量密度可充电电池提供了可行的正极材料.

关键词:

的扩散是的扩散.富含的 Mn 基阴极.活动活动活动活动活动活动.阴离子氧化还原剂可逆性的可逆性

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