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Consummating ion desolvation in hard carbon anodes for reversible sodium storage

Author

Listed:
  • Ziyang Lu

    (University of Tsukuba)

  • Huijun Yang

    (University of Tsukuba)

  • Yong Guo

    (Tianjin University)

  • Hongxin Lin

    (Xiamen University)

  • Peizhao Shan

    (Xiamen University)

  • Shichao Wu

    (Tianjin University)

  • Ping He

    (Nanjing University)

  • Yong Yang

    (Xiamen University)

  • Quan-Hong Yang

    (Tianjin University)

  • Haoshen Zhou

    (University of Tsukuba
    Nanjing University)

Abstract

Hard carbons are emerging as the most viable anodes to support the commercialization of sodium-ion (Na-ion) batteries due to their competitive performance. However, the hard carbon anode suffers from low initial Coulombic efficiency (ICE), and the ambiguous Na-ion (Na+) storage mechanism and interfacial chemistry fail to give a reasonable interpretation. Here, we have identified the time-dependent ion pre-desolvation on the nanopore of hard carbons, which significantly affects the Na+ storage efficiency by altering the solvation structure of electrolytes. Consummating the pre-desolvation by extending the aging time, generates a highly aggregated electrolyte configuration inside the nanopore, resulting in negligible reductive decomposition of electrolytes. When applying the above insights, the hard carbon anodes achieve a high average ICE of 98.21% in the absence of any Na supplementation techniques. Therefore, the negative-to-positive capacity ratio can be reduced to 1.02 for full cells, which enables an improved energy density. The insight into hard carbons and related interphases may be extended to other battery systems and support the continued development of battery technology.

Suggested Citation

  • Ziyang Lu & Huijun Yang & Yong Guo & Hongxin Lin & Peizhao Shan & Shichao Wu & Ping He & Yong Yang & Quan-Hong Yang & Haoshen Zhou, 2024. "Consummating ion desolvation in hard carbon anodes for reversible sodium storage," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47522-y
    DOI: 10.1038/s41467-024-47522-y
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    1. Wenyi Liu & Wenjun Cui & Chengjun Yi & Jiale Xia & Jinbing Shang & Weifei Hu & Zhuo Wang & Xiahan Sang & Yuanyuan Li & Jinping Liu, 2024. "Understanding pillar chemistry in potassium-containing polyanion materials for long-lasting sodium-ion batteries," Nature Communications, Nature, vol. 15(1), pages 1-15, December.

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