Undesirable interfacial reactions and the resulting capacity degradation hinder the widespread application of lithium-rich layered oxide (LLO) as a cathode in high-energy lithium-ion batteries. Herein, a method to suppress the interfacial reactions of LLO is devised by treating the carbonate precursor with weak-base salts to induce elemental segregation and promote particle growth, by which a rock-salt structure is in-situ constructed on the particle surface. This rock-salt structure is in excellent lattice alignment with the internal structure, which is conducive to enhancing surface structural stability and suppressing interfacial reactions. As a result, the two treated samples deliver a capacity retention ratio larger than 93.9% after 200 cycles, with much superior voltage and capacity stability than the untreated sample. This in-situ construction method is beneficial for developing advanced LLO cathodes.

中文翻译：

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相间工程旨在实现无 Co 富锂层状氧化物的卓越结构稳定性


不良的界面反应和由此产生的容量退化阻碍了富锂层状氧化物 （LLO） 作为阴极在高能锂离子电池中的广泛应用。在此，设计了一种抑制 LLO 界面反应的方法，通过用弱碱盐处理碳酸盐前驱体以诱导元素偏析并促进颗粒生长，从而在颗粒表面原位构建岩盐结构。这种岩盐结构与内部结构具有极好的晶格排列，有利于增强表面结构稳定性和抑制界面反应。因此，两个处理过的样品在 200 次循环后提供大于 93.9% 的容量保留率，具有比未处理样品优越得多的电压和容量稳定性。这种原位构建方法有利于开发先进的 LLO 阴极。