Li(NixMnyCoz)O2 cathode materials (NMC) have advantages such as the good Li ion diffusivity, stable reversible capacity, and environmental compatibility in spite of a low actual capacity. Although a double-layer lithium structure can be generated by pre-lithiation, the thickness is very small and the capacity improvement is limited. In this work, a series of Li([Formula: see text][Formula: see text][Formula: see text])O2 nanoparticles are prepared by the sol–gel method and centrifugation and the pre-lithiation process are monitored by transmission electron microscope (TEM). A double lithium structure of about 10 nanometers thick is produced on the NMC materials with different sizes. With decreasing NMC particle size, the proportion of the double-layer lithium structure increases and reaches 48% for a particle diameter of 100[Formula: see text]nm. The results reveal a viable means to improve the capacity of NMC materials in charging and discharging.

中文翻译：

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具有双层锂结构的预锂化 Li(NixMnyCoz)O2 纳米粒子

李(镍X锰是的公司z)O2正极材料（NMC）虽然实际容量较低，但具有良好的锂离子扩散性、稳定的可逆容量和环境相容性等优点。虽然预锂化可以生成双层锂结构，但厚度非常小，容量提升有限。在这项工作中，一系列的 Li([公式：见正文][公式：见正文][公式：见正文])O2通过溶胶-凝胶法制备纳米颗粒，并通过透射电子显微镜（TEM）监测离心和预锂化过程。在不同尺寸的NMC材料上产生了约10纳米厚的双锂结构。随着NMC粒径的减小，双层锂结构的比例增加，粒径为100[公式：见正文]nm时达到48%。结果揭示了提高NMC材料充放电容量的可行方法。