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Highly durable organic electrode for sodium-ion batteries via a stabilized α-C radical intermediate

Author

Listed:
  • Shaofei Wu

    (South University of Science and Technology of China)

  • Wenxi Wang

    (South University of Science and Technology of China)

  • Minchan Li

    (South University of Science and Technology of China)

  • Lujie Cao

    (South University of Science and Technology of China)

  • Fucong Lyu

    (South University of Science and Technology of China)

  • Mingyang Yang

    (South University of Science and Technology of China)

  • Zhenyu Wang

    (South University of Science and Technology of China)

  • Yang Shi

    (South University of Science and Technology of China)

  • Bo Nan

    (South University of Science and Technology of China)

  • Sicen Yu

    (South University of Science and Technology of China)

  • Zhifang Sun

    (South University of Science and Technology of China)

  • Yao Liu

    (South University of Science and Technology of China)

  • Zhouguang Lu

    (South University of Science and Technology of China)

Abstract

It is a challenge to prepare organic electrodes for sodium-ion batteries with long cycle life and high capacity. The highly reactive radical intermediates generated during the sodiation/desodiation process could be a critical issue because of undesired side reactions. Here we present durable electrodes with a stabilized α-C radical intermediate. Through the resonance effect as well as steric effects, the excessive reactivity of the unpaired electron is successfully suppressed, thus developing an electrode with stable cycling for over 2,000 cycles with 96.8% capacity retention. In addition, the α-radical demonstrates reversible transformation between three states: C=C; α-C·radical; and α-C− anion. Such transformation provides additional Na+ storage equal to more than 0.83 Na+ insertion per α-C radical for the electrodes. The strategy of intermediate radical stabilization could be enlightening in the design of organic electrodes with enhanced cycling life and energy storage capability.

Suggested Citation

  • Shaofei Wu & Wenxi Wang & Minchan Li & Lujie Cao & Fucong Lyu & Mingyang Yang & Zhenyu Wang & Yang Shi & Bo Nan & Sicen Yu & Zhifang Sun & Yao Liu & Zhouguang Lu, 2016. "Highly durable organic electrode for sodium-ion batteries via a stabilized α-C radical intermediate," Nature Communications, Nature, vol. 7(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13318
    DOI: 10.1038/ncomms13318
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