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High-performance battery electrodes via magnetic templating

Nature Energy volume 1, Article number: 16099 (2016) | Download Citation

Abstract

In lithium-ion batteries, the critical need for high-energy-density, low-cost storage for applications ranging from wearable computing to megawatt-scale stationary storage has created an unmet need for facile methods to produce high-density, low-tortuosity, kinetically accessible storage electrodes. Here we show that magnetic control of sacrificial features enables the creation of directional pore arrays in lithium-ion electrodes. The directional pores result in faster charge transport kinetics and enable electrodes with more than threefold higher area capacity (for example, >12 mAh cm−2 versus <4 mAh cm−2 in conventional electrodes) at practical charge–discharge rates. We demonstrate these capabilities in laboratory cells under various test conditions, including an electric vehicle model drive cycle.

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Acknowledgements

This work was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the US Department of Energy under Contract no. DE-AC02-05CH11231, Subcontract no. 7056592 under the Batteries for Advanced Transportation Technologies (BATT) Program. J.S.S. thanks the Swiss National Science Foundation for financial Support (Grant Numbers P300P2_154584 and P2EZP2_148768).

Author information

Affiliations

  1. Department of Materials Science and Engineering, MIT, Cambridge, Massachusetts 02139, USA

    • J. S. Sander
    • , L. Li
    •  & Y.-M. Chiang
  2. Department of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, USA

    • R. M. Erb
    •  & A. Gurijala

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Contributions

J.S.S., R.M.E. and Y.-M.C. conceived the research, designed the experiments, and wrote the manuscript. J.S.S., L.L. and A.G. carried out the experiments and analysed the data.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Y.-M. Chiang.

Supplementary information

PDF files

  1. 1.

    Supplementary Information

    Supplementary Figures 1–5

Videos

  1. 1.

    Supplementary Video 1

    Out-of-plane alignment of magnetic emulsion droplets in water. The movie shows chaining and alignment of magnetic emulsion droplets in a dc magnetic field.

  2. 2.

    Supplementary Video 2

    Out-of-plane alignment of magnetic emulsion droplets in water. The movie shows chaining and alignment of magnetic emulsion droplets in a dc magnetic field.

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DOI

https://doi.org/10.1038/nenergy.2016.99

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