Enabling High Capacity and Coulombic Efficiency for Li‐NCM811 Cells Using a Highly Concentrated Electrolyte. Issue 2 (29th October 2020)

• Record Type: Journal Article
• Authors: Philip, Maria A.; Haasch, Richard T.; Kim, Jutae; Yang, Jianzhong; Yang, Rachel; Kochetkov, Ivan R.; Nazar, Linda F.; Gewirth, Andrew A.
• Is Part Of: Batteries & supercaps. Volume 4:Issue 2(2021)
• Page Start: 294
• Page End: 303
• Publication Date: 2020-10-29
• Subjects: concentrated electrolyte -- electrochemistry -- interfaces -- lithium metal anode -- NCM811 cathode; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202000192
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: 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 LiNi0.8 Co0.1 Mn0.1 O2 . 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. Abstract : The more the merrier : The use of a highly concentrated electrolyte in place of a dilute 1 m LiPF6 electrolyte in a Li||NCM811 cell stabilizes the Li metal anode interface. This stabilization effect results in a lower cell resistivity, higher discharge capacity, and higher Coulombic efficiency.