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Conductive thin-layer on as-prepared positive electrode by vapour reaction printing for high-performance lithium-ion batteries

Abstract

Surface modification, especially thin-layered coating, has provided a major breakthroughs in high-performance lithium-ion batteries (LIB). The surface coating of conductive materials at the level of single active particles has been used to overcome poor conductivity in the electrode. Nevertheless, the resulting decrease in the volumetric capacity and the complexity of the required manufacturing conditions are problematic for a particle-scale coating techniques. Here, we report a facile alternative route to conformal thin-layered conducting poly(3,4-ethylenedioxythiophene) (PEDOT) through vapour reaction printing (VRP) on as-prepared electrodes. A positive electrode based on micron-sized LiFePO4 (LFP) was used to highlight the possible improvements in the intrinsic limitations of poor electrical and ionic conductivity. The effective conformal surface coating of thin PEDOT layer was confirmed by scanning electron microscopy and X-ray photoelectron spectroscopy. The PEDOT coated LFP electrodes exhibited outstanding improvements not only in cycling stability, showing 96.6% retention of the initial capacity after 100 cycles, but also in their rate capability, achieving 0.668 mAh at a rate of 1C. The uncoated pristine LFP electrode showed only 23.5 % of the initial capacity after 100 cycles and 0.181 mAh at a rate of 1 C. These remarkable results were attributed to the conformal PEDOT layer, which offers improved conduction pathways and ion diffusion. Therefore, this new method of coating the as-prepared electrode with a conductive conformal thin-layer is promising for the design of electrodes for high-performance lithium-ion batteries.

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Publication details

The article was received on 28 Jun 2017, accepted on 11 Sep 2017 and first published on 11 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA05591A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Conductive thin-layer on as-prepared positive electrode by vapour reaction printing for high-performance lithium-ion batteries

    J. Ahn, S. Yoon, S. G. Jung, J. Yim and K. Y. Cho, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA05591A

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