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稳定和快速的离子运输电解质接口被修改为含和的新型溶剂,用于丰富的阴极材料

Xiaoli Peng¹, Hongmei Shen¹, Kai Su¹

¹School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China.

ACS applied materials & interfaces

|June 17, 2024

概括

这项研究引入了甲基-2--4-三甲基酸盐 (MNTB) 和乙烯碳酸盐 (FEC) 作为增强离子电池性能的添加剂. MNTB/FEC组合创建了一个稳定的阴极-电解质间相,显著改善NCM811阴极的循环稳定性和容量保留.

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:

富含的第三层氧化物LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) 为先进的电池提供了高能量密度.
脆弱的阴极-电解质界面 (CEI) 由于粒子粉碎,结构崩和电解质分解,限制了NCM811的性能.
现有的添加剂,如乙烯碳酸盐 (FEC),可以增加接口阻抗和极化.

研究的目的:

使用一种新型的添加剂策略,为NCM811阴极开发一种强大的CEI薄膜.
为了提高基于NCM811的离子电池的电化学性能,循环稳定性和速率能力.
为了减轻HF腐蚀和接口阻抗等问题.

主要方法:

甲基-2--4-三甲基酸盐 (MNTB) 与乙烯碳酸盐 (FEC) 的协同调节,形成CEI膜.
对CEI薄膜组成 (Li₃N,LiF,Li₂O) 和其结构特征的分析.
在各种条件下 (高电压,高速率) 用MNTB/FEC修改过的电解质对NCM811红色白色Li电池进行电化学测试.

主要成果:

通过MNTB/FEC添加剂的组合,产生了一种密集,稳定,富含无机物CEI薄膜.
具有MNTB/FEC的NCM811电池表现出显著改善的循环稳定性,在4.3V的300个循环后保持81.10%的容量,而标准电解质的容量为32.8%.
速度能力得到了增强,在7°C下容量为115.43 mA hg-1 ,而标准电解质的容量为93.34 mA hg-1.

结论:

与FEC协同调节的MNTB有效地形成了一个强大的CEI,在高切断电压下增强NCM811的稳定性.
MNTB/FEC策略改善了Li+迁移,NCM811的结构完整性,并抑制了有害的副作用.
这种方法为改善离子电池中商业NCM811电极的性能和稳定性提供了一个有希望的修改策略.

关键词:

这是一部CEI电影.在NCM81111中,使用的是NCM811 消除了高频率的存在.气和气中的气和.协同调节协同调节.

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