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化高压电解质用于稳定富含的电池

Christopher Poches¹, Amir Abdul Razzaq¹, Haiden Studer¹

¹Department of Mechanical Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, United States.

ACS applied materials & interfaces

|September 11, 2023

概括

使用化溶剂的新型高压稳定电解质 (HVE) 显著改善了富含 (Ni) 的电池的循环寿命. 这种HVE在4.5V的500个循环后保持80%的容量,克服了高能量密度离子电池的降解问题.

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:

最先进的离子电池正在接近其特定的能量极限.
富含 (富含Ni) 的阴极材料,如LiNi_0.8Mn_0.1Co_0.1O₂ (NMC811),具有更高的特定容量和能量密度.
富含的阴极在高电压下由于结构变化和副作用而遭受容量降解.

研究的目的:

开发和评估一种基于化溶剂的新型高压稳定电解质 (HVE),用于丰富的正极式电池.
使用HVE与基线电解质 (BE) 相比,评估Li/NMC811细胞的循环性能和稳定性.
通过物理,电化学和理论分析,了解改善循环稳定的背后机制.

主要方法:

一种HVE的配方,包括Li bis(trifluoromethanesulfonyl) imide (LiTFSI) 在乙烯碳酸盐 (FEC),bis(2,2,2-trifluoroethyl) 碳酸盐 (FDEC) 和甲基 (2,2,2-trifluoroethyl) 碳酸盐 (FEMC) 中,并添加Li二酸盐 (LiDFOB) 添加剂.
使用HVE和BE的Li/NMC811电池电池的电化学评估.
在4.5V的高切断电压下进行长期循环测试,与Li/Li+相比.
物理和电化学分析,以调查电解质稳定性.
密度函数理论 (DFT) 建模,以评估电解质氧化/脱趋势.

主要成果:

带有HVE的Li/NMC811细胞表现出优异的长期循环性能,在4.5V的500个循环后保持大约80%的容量.
在循环稳定性方面,HVE显著优于基线电解质 (BE).
DFT建模表明,HVE与BE相比,对去/氧化的倾向较低,这有助于其增强的稳定性.

结论:

开发的基于化溶剂的HVE有效地提高了高电压下基于Ni丰富阴极的电池的循环稳定性.
性能提升归因于HVE固有的高压稳定性,减少了寄生反应和材料降解.
这项研究提供了一种有前途的策略,以克服丰富的阴极中的循环降解挑战,从而实现具有长周期寿命的高能量密度电池.

关键词:

密度函数理论建模密度函数理论建模化高压电解质的高压电解质化溶剂化溶剂离子电池是一种离子电池.富含的阴极是什么意思

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