Enabling High Capacity and Coulombic Efficiency for Li‐NCM811 Cells Using a Highly Concentrated Electrolyte,Batteries & Supercaps

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Enabling High Capacity and Coulombic Efficiency for Li‐NCM811 Cells Using a Highly Concentrated Electrolyte
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-09-22 , DOI: 10.1002/batt.202000192
Maria A. Philip ₁ , Richard T. Haasch ₂ , Jutae Kim ₁ , Jianzhong Yang ₃ , Rachel Yang ₁ , Ivan R. Kochetkov ₄ , Linda F. Nazar ₄ , Andrew A. Gewirth ₅

Affiliation

Lithium metal batteries suffer from dendrite formation and the associated safety hazards of thermal runaway reactions. In this study, we report the performances of a highly concentrated electrolyte (HCE) and a dilute LiPF₆ electrolyte in lithium metal cells using LiNi_0.8Co_0.1Mn_0.1O₂. While the HCE exhibits lower bulk ionic conductivity than the dilute LiPF₆ electrolyte, the cell conductivity is higher for the HCE system, indicating higher thermodynamic stability of the electrolyte against the electrodes. Full cell cycling demonstrates higher capacity for the HCE system, which declines as a function of cycle number due to the formation of decomposition products, similar to the dilute LiPF₆ system. The origin of the enhanced performance is the higher stability of the HCE against a Li metal anode as compared to the dilute LiPF₆ electrolyte. Cycling at higher temperatures further enhances the performance of the HCE, which is more thermally stable than the dilute LiPF₆ electrolyte.

中文翻译：

使用高浓度电解质为Li-NCM811电池实现高容量和库仑效率

锂金属电池遭受枝晶形成以及热失控反应的相关安全隐患的困扰。在这项研究中，我们报告了使用LiNi _0.8 Co _0.1 Mn _0.1 O ₂在锂金属电池中高浓度电解质（HCE）和稀LiPF ₆电解质的性能。虽然HCE的体积离子电导率比LiPF ₆稀释的电导率低电解质，对于HCE系统，电池电导率较高，表明电解质对电极的热力学稳定性更高。完整的电池循环显示出HCE系统的更高容量，该功能由于分解产物的形成而与循环次数成函数关系，类似于稀LiPF ₆系统。与稀释的LiPF ₆电解质相比，增强性能的起因是HCE对Li金属阳极的稳定性更高。在更高温度下循环可进一步增强HCE的性能，该HCE比稀释的LiPF ₆电解质更热稳定。

更新日期：2020-09-22

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