Effect of thickness on the maximum potential drop of current collectors

Abstract

The basic principle for achieving high-power capability on an electrochemical energy storage cell is minimizing the overall resistance. The resistance due to current collecting systems has not received sufficient attention in the past, presumably because it was not considered of significance for low-power batteries and supercapacitors. However, the necessity of high-power cells has reduced other sources of the inner resistance, and the current collector potential drop has become more important. Moreover, the miniaturization of energy storage devices could increase the ohmic loses in current collectors. In this work, we have developed an electrical model to assess the effect of the current collector thickness on the maximum potential drop. We have found that the thickness of current collectors is a critical parameter that can increase the maximum potential drop drastically. Indeed, the maximum potential drop of current collectors remains almost constant for thicknesses greater than 500 μm, but below this value, there is an inverse relationship between the maximum potential drop and the thickness. We have also analyzed the effect of the material and tab position in the maximum potential drop.

Two-Dimensional Materials to Address the Lithium Battery Challenges

“…As key component of batteries, current collectors are responsible for allowing the electrons to flow though the electrical circuit during charge/discharge. Low electrical conductivity often leads to intensified voltage polarization and poor electrochemical performance. , The electrical conductivity is dependent on a variety of factors including synthesis methods, purification degree, and the thickness of a material. , Therefore, these materials should be tuned to have a low electrical resistance of usually < 0.001 Ω cm, i.e. , high electrical conductivity of >1000 S/cm .…”

“…340,341 The electrical conductivity is dependent on a variety of factors including synthesis methods, purification degree, and the thickness of a material. 342,343 Therefore, these materials should be tuned to have a low electrical resistance of usually < 0.001 Ω cm, i.e., high electrical conductivity of >1000 S/cm. 341 In addition, current collectors should endure aggravated electrochemical environments.…”