EIS Study on the Electrode-Separator Interface Lamination

Batteries

Madhav Singh¹  Alexander Dinter¹  Martin Frankenberger¹  Karl-Heinz Pettinger¹ 

[1] Technology Center for Energy, University of Applied Sciences Landshut, Wiesenweg 1, D-94099 Ruhstorf, Germany;

关键词: lithium-ion battery;    lamination;    electrochemical impedance spectroscopy;    fast-charging capability;    lifetime;   

DOI  :  10.3390/batteries5040071

来源: DOAJ

【 摘 要 】

This paper presents a comprehensive study of the influences of lamination at both electrode-separator interfaces of lithium-ion batteries consisting of LiNi_1/3Mn_1/3Co_1/3O₂ cathodes and graphite anodes. Typically, electrode-separator lamination shows a reduced capacity fade at fast-charging cycles. To study this behavior in detail, the anode and cathode were laminated separately to the separator and compared to the fully laminated and non-laminated state in single-cell format. The impedance of the cells was measured at different states of charge and during the cycling test up to 1500 fast-charging cycles. Lamination on the cathode interface clearly shows an initial decrease in the surface resistance with no correlation to aging effects along cycling, while lamination on both electrode-separator interfaces reduces the growth of the surface resistance along cycling. Lamination only on the anode-separator interface shows up to be sufficient to maintain the enhanced fast-charging capability for 1500 cycles, what we prove to arise from a significant reduction in growth of the solid electrolyte interface.

【 授权许可】

Unknown