Cobalt-free lithium nickel oxide (LNO) has garnered significant interest as the end member of high-nickel layered oxide cathodes for next-generation batteries. However, its practical performance notably underperforms expectations because of the structural degradation and unstable interfacial chemistry with electrolytes during cycling. Here, we report that a durable cathode-electrolyte interface (CEI), enriched by in situ formed sulfides and borides, can inhibit LNO structural degradation and suppress Ni ion dissolution. With the CEI protection, the stability of LNO can be remarkably extended, and batteries demonstrate a capacity retention rate of 84% (30 °C) and 79% (50 °C) after 200 cycles at 1C, respectively. These results demonstrate that enriching CEI with sulfur-containing species can effectively stabilize the interfacial chemistry of LNO, particularly at an elevated temperature of 50 °C. This finding provides valuable perspectives on designing electrolytes for cobalt-free LNO and other high-Ni cathodes toward the development of next-generation high-energy-density lithium-ion batteries.

中文翻译：

---

通过富含硫化物的阴极电解质界面实现无钴 LiNiO2 阴极的高稳定性

作为下一代电池高镍层状氧化物阴极的最终成员，无钴锂镍氧化物（LNO）引起了人们的极大兴趣。然而，由于循环过程中的结构退化和与电解质的不稳定界面化学，其实际性能明显低于预期。在这里，我们报道了一种耐用的阴极电解质界面（CEI），通过原位形成的硫化物和硼化物富集，可以抑制 LNO 结构降解并抑制 Ni 离子溶解。通过CEI保护，LNO的稳定性可以显着延长，电池在1C下循环200次后的容量保持率分别为84% (30 °C)和79% (50 °C)。这些结果表明，用含硫物质富集 CEI 可以有效稳定 LNO 的界面化学，特别是在 50 °C 的高温下。这一发现为设计无钴 LNO 和其他高镍阴极电解质以开发下一代高能量密度锂离子电池提供了宝贵的视角。