Internal resistance mapping preparation to optimize electrode thickness and density using symmetric cell for high-performance lithium-ion batteries and capacitors

JOURNAL OF POWER SOURCES

卷:396

Article

Kisu, Kazuaki^1,2  Aoyagi, Shintaro¹  Nagatomo, Haruka¹  Iwama, Etsuro^1,2  Reid, McMahon Thomas Homer^1,2  Naoi, Wako²  Naoi, Katsuhiko^1,2,3,4 

[1] Tokyo Univ Agr & Technol, Dept Appl Chem, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan

[2] Tokyo Univ Agr & Technol, Inst Global Innovat Res, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan

[3] K&W Inc, Div Art & Innovat Technol, 1-3-16-901 Higashi, Tokyo 1860002, Japan

[4] Tokyo Univ Agr & Technol, Adv Capacitor Res Ctr, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan

关键词: Lithium-ion batteries;    Internal resistance;    Composite electrode;    Symmetric cell;    Electrode density;   

DOI  :  10.1016/j.jpowsour.2018.05.083

来源: Elsevier

【 摘 要 】

Methods for characterizing and optimizing the internal resistance of electrodes are crucial for achieving the simultaneous goals of high energy density and high power density in lithium-ion batteries. In this study we proposeand confirm the efficacy ofa method for electrode design optimization based on the construction of an internal resistance map, a visualization tool for minimizing electrode resistance. The construction of the map proceeds by identifying the three primary components of the electrode resistancecharge-transfer resistance, ionic resistance, and contact resistanceand elucidating the dependence of each component on electrode density and thickness. We fabricate electrode sheets of various densities and thicknesses and conduct electrode impedance spectroscopy (EIS) measurements to measure the dependence of internal resistance on density and thickness, which we characterize via empirical formulas incorporated into our internal resistance map. Using our map, we predict that the resistance per unit area of a nickel-cobalt- manganese (NCM) electrode attains its minimum value at thickness 70 mu m and density 2.9 g cm(-3). We then further use the map to predict variations in IR drop for NCM electrodes of different densities, obtaining results in excellent agreement with experimental measurements.

【 授权许可】

Free