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Proceedings Paper

Laser processing of thick Li(NiMnCo)O2 electrodes for lithium-ion batteries
Author(s): J.-H. Rakebrandt; P. Smyrek; Y. Zheng; H. J. Seifert; W. Pfleging
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Paper Abstract

Lithium-ion batteries became the most promising types of mobile energy storage devices due to their high gravimetric and volumetric capacity, high cycle life-time, and low self-discharge. Nowadays, the cathode material lithium nickel manganese cobalt oxide (NMC) is one of the most widely used cathode material in commercial lithium-ion batteries due to many advantages such as high energy density (>150 Wh kg-1) on cell level, high power density (650 W kg-1 @ 25 °C and 50 % Depth of Discharge) [1], high specific capacity (163 mAh g-1) [2], high rate capability and good thermal stability in the fully charged state. However, in order to meet the requirements for the increasing demand for rechargeable high energy batteries, nickel-rich NMC electrodes with specific capacities up to 210 mAh g-1 seem to be the next generation cathodes which can reach on cell level desired energy densities higher than 250 Wh kg-1 [3]. Laser-structuring now enables to combine both concepts, high power and high energy lithium-ion batteries. For this purpose, lithium nickel manganese cobalt oxide cathodes were produced via tape casting containing 85-90 wt% of active material with a film thickness of 50-260 μm. The specific capacities were measured using galvanostatic measurements for different types of NMC with varying nickel, manganese and cobalt content at different charging/discharging currents ("C-rates"). An improved lithium-ion diffusion kinetics due to an increased active surface area could be achieved by laser-assisted generating of three dimensional architectures. Cells with unstructured and structured cathodes were compared. Ultrafast laser ablation was used in order to avoid a thermal impact to the material. It was shown that laser structuring of electrode materials leads to a significant improvement in electrochemical performance, especially at high charging and discharging C-rates.

Paper Details

Date Published: 17 February 2017
PDF: 7 pages
Proc. SPIE 10092, Laser-based Micro- and Nanoprocessing XI, 100920M (17 February 2017); doi: 10.1117/12.2252093
Show Author Affiliations
J.-H. Rakebrandt, Karlsruhe Institute of Technology (Germany)
P. Smyrek, Karlsruhe Institute of Technology (Germany)
Karlsruhe Nano Micro Facility (Germany)
Y. Zheng, Karlsruhe Institute of Technology (Germany)
Karlsruhe Nano Micro Facility (Germany)
H. J. Seifert, Karlsruhe Institute of Technology (Germany)
W. Pfleging, Karlsruhe Institute of Technology (Germany)
Karlsruhe Nano Micro Facility (Germany)

Published in SPIE Proceedings Vol. 10092:
Laser-based Micro- and Nanoprocessing XI
Udo Klotzbach; Kunihiko Washio; Rainer Kling, Editor(s)

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