Interface instability that stems from highly catalytic Ni-rich layered cathode and highly reactive lithium metal anode is the key to hindering the development of high-voltage lithium metal batteries (LMBs). Herein, we designed a multifunctional polyamide-based quasi-solid electrolyte (PAM-QSE) to construct a robust cathode electrolyte interphase (CEI) and stable solid electrolyte interphase (SEI) layers on both Ni-rich cathode and Li metal anode and improve flame-retardancy simultaneously. The SEI structure consists of rich lithiophilic N–(C)₃ to homogenize ion distribution and high ionic conductive Li₃N to guide the rapid transform of Li⁺, effectively reshaping the uneven Li⁺ plating/stripping behavior, whereas the CEI structure comprises high antioxidative amide organic species, which mitigates the detrimental parasitic reactions between active materials and electrolytes and alleviates surface structure degradation of cathode. As a result, LiNi_0.6Co_0.2Mn_0.2O₂/Li battery using flame-retardant PAM-QSE delivers excellent long-term cyclability even with high cathode loading (∼6 mg cm^–2) and ultrathin Li (∼50 μm).

中文翻译：

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通过聚酰胺基准固体电解质升级长寿命富镍锂金属电池的电极/电解质中间相

源于高催化富镍层状阴极和高反应性锂金属阳极的界面不稳定性是阻碍高压锂金属电池（LMB）发展的关键。本文中，我们设计了一种多功能聚酰胺基准固体电解质（PAM-QSE），以在富镍阴极和Li金属阳极上构造坚固的阴极电解质中间相（CEI）和稳定的固态电解质中间相（SEI）层，并改善火焰-同时延迟。SEI结构由富集亲锂的N–（C）₃使离子分布均匀，以及高离子导电性Li ₃ N指导Li ⁺的快速转变，有效地重整了不均匀的Li ⁺电镀/剥离行为，而CEI结构包含高抗氧化酰胺有机物，这减轻了活性材料与电解质之间有害的寄生反应，并减轻了阴极的表面结构退化。结果，即使使用高阴极负载（〜6 mg cm ^-2）和超薄锂（〜50μm ），使用阻燃PAM-QSE的LiNi _0.6 Co _0.2 Mn _0.2 O ₂ / Li电池也具有出色的长期循环性。