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Memory effect in a lithium-ion battery

Nature Materials volume 12, pages 569575 (2013) | Download Citation

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Abstract

Memory effects are well known to users of nickel–cadmium and nickel–metal-hydride batteries. If these batteries are recharged repeatedly after being only partially discharged, they gradually lose usable capacity owing to a reduced working voltage. Lithium-ion batteries, in contrast, are considered to have no memory effect. Here we report a memory effect in LiFePO4—one of the materials used for the positive electrode in Li-ion batteries—that appears already after only one cycle of partial charge and discharge. We characterize this memory effect of LiFePO4 and explain its connection to the particle-by-particle charge/discharge model. This effect is important for most battery uses, as the slight voltage change it causes can lead to substantial miscalculations in estimating the state of charge of batteries.

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Acknowledgements

We would like to thank C. Villevieille for experimental support and advice, M. Heß for helpful discussions and comments, S. Urbonaite for valuable suggestions on the manuscript and H. Kaiser and C. Junker for all-round technical assistance.

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Affiliations

  1. Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

    • Tsuyoshi Sasaki
    •  & Petr Novák
  2. Toyota Central R&D Labs., Battery Laboratory, 41-1, Yokomichi, Nagakute, Aichi 480-1192, Japan

    • Tsuyoshi Sasaki
    •  & Yoshio Ukyo

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Contributions

T.S. conceived and carried out the experiments, analysed the data and wrote the paper, Y.U. directed this work, and P.N. discussed and directed this work.

Competing interests

The authors declare no competing financial interests.

Corresponding authors

Correspondence to Tsuyoshi Sasaki or Petr Novák.

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DOI

https://doi.org/10.1038/nmat3623

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