Experimental investigation of the lithium-ion battery impedance characteristic at various conditions and aging states and its influence on the application

Impact of Temperature and Discharge Rate on the Aging of a LiCoO2/LiNi0.8Co0.15Al0.05O2Lithium-Ion Pouch Cell

“…23 The ohmic resistance originates from the bulk chemistry of a cell, including resistance of the electrolyte, active materials and current collectors. 5,[24][25][26][27] The ohmic resistance increase mainly originates from the decomposition of electrolyte, including both conductive salt and solvent, which in turn changes the electrolyte conductivity. 21,[28][29][30] The cell cycled at 40 • C with a higher aging rate and a new cell were disassembled.…”

A study of the effects of external pressure on the electrical performance of a lithium-ion pouch cell

“…fig. 5 (a) and (b) is due to change in temperature [9,10]. However, total resistance R d increases, as external pressure increases at both temperatures tested.…”

“…Impedance rise originating from different phenomenon are separated by their different time constant [9][10][11]. By analyzing the impedance spectrum in Nyquist representation the root cause can be identified.…”

“…However, total resistance R d increases, as external pressure increases at both temperatures tested. This indicates external pressure changes the bulk transport properties of active materials of the cell [9]. R d is plotted against the external pressure in fig.…”

“…The first parameter is R 0 , which is the point on the 'x' axis where the impedance spectrum crosses the axis. It is commonly referred to as the pure ohomic resistance of the cell [9]. The second parameter is R d , the real part of the battery impedance when negative imaginary part has the local minimum at the higher end of the 'x' axis.…”