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一种多功能双阴离子兴奋剂策略,以稳定高压中低层氧化物阴极

Yabin Shen¹, Dongming Yin², Hongjin Xue³

¹Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450002, China.

Journal of colloid and interface science

|March 6, 2024

概括

Al/Zr 双离子兴奋剂增强了用于离子电池的高压层氧化物阴极. 这一策略改善了结构稳定性和扩散,提高了先进电池应用的性能和循环寿命.

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:

中,低的层氧化物阴极为离子电池提供成本和容量优势.
这些阴极的高充电电压会导致结构退化和扩散差,限制性能.
现有的阴极材料在高工作电压下难以保持稳定性和效率.

研究的目的:

提高 LiNi0.6Co0.05Mn0.35O2 (NCM) 阴极材料在 4.5 V 的高充电电压下的电化学性能.
研究Al/Zr双离子兴奋剂对NCM阴极的结构完整性和离子动力学的影响.
为了改善基于NCM的阴极的循环寿命和速率能力,用于实际的离子电池应用.

主要方法:

在LiNi0.6Co0.05Mn0.35O2 (NCM) 阴极材料上采用了一种多功能Al/Zr双离子兴奋剂策略.
在 4.5 V 的高充电切断电压下评估了电化学性能.
使用磁相互作用和键强度原理分析了结构稳定性和扩散动力学.

主要成果:

/联合兴奋剂 (NCMAZ) 抑制了Li+/Ni2+的混合,增加了扩散率,并阻止了H1/H2阶段的共存.
通过强大的Al-O和Zr-O键增强了晶格氧框架的稳定性,抑制了H2-H3相变和氧气损失.
在100个循环后,NCMAZ表现出94.2%的容量保留率,明显超过未使用过的NCM (79.4%).
NCMAZ表现出优越的速率性能,在5C下提供92 mAh/g,而NCM则为59 mAh/g.

结论:

Al/Zr 双离子兴奋剂是一种有效的策略,可以增强中,低层氧化物阴极的高压性能.
兴奋剂方法提高了结构稳定性和离子动力学,从而延长了循环寿命和更好的速率能力.
这种修改策略使高压NCM阴极更接近先进离子电池的实际应用.

关键词:

双质子兴奋剂是双质子兴奋剂.高压低阴极高压低阴极格子氧气稳定性格子氧气稳定性 (+) /尼 (2+) 的混合.离子电池是一种离子电池.

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