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<p>Fine particles with carbon coating are generally necessary to achieve acceptable electrochemical performance for LiFePO<sub>4</sub> (LFP) due to the poor intrinsic electric and ionic conductivities. In this work, the synergy of polyethylene glycol (PEG) was investigated as both grinding aid and carbon source to modify LFP toward high performance. The yielded graphite coating has a limited thickness of 8&#xa0;nm, regardless of the concentration and molecular weight of PEG, while the extra concentration results in amorphous carbon dispersed among particles. A higher PEG concentration produces finer LFP particles but less active materials, while the semi-solid PEG shows the best grinding effect toward a reversible capacity close to the theoretical value. These results could be well addressed based on polymer conformations, and this work paves a more efficient way to develop high-performance LFP.</p>

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Synergy of polyethylene glycol as grinding aids and carbon-coating sources for LiFePO4 cathodes toward its theoretical capacity

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Jialin Song,
  • Yingmin Wang,
  • Yitong Guo,
  • Jianbing Qiang,
  • Zhangjie Xu,
  • Jiliang Zhang

摘要

Fine particles with carbon coating are generally necessary to achieve acceptable electrochemical performance for LiFePO4 (LFP) due to the poor intrinsic electric and ionic conductivities. In this work, the synergy of polyethylene glycol (PEG) was investigated as both grinding aid and carbon source to modify LFP toward high performance. The yielded graphite coating has a limited thickness of 8 nm, regardless of the concentration and molecular weight of PEG, while the extra concentration results in amorphous carbon dispersed among particles. A higher PEG concentration produces finer LFP particles but less active materials, while the semi-solid PEG shows the best grinding effect toward a reversible capacity close to the theoretical value. These results could be well addressed based on polymer conformations, and this work paves a more efficient way to develop high-performance LFP.