Amide-Functional, Li3N/LiF-Rich Heterostructured Electrode Electrolyte Interphases for 4.6 V Li||LiCoO2 Batteries,Advanced Energy Materials

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Amide-Functional, Li3N/LiF-Rich Heterostructured Electrode Electrolyte Interphases for 4.6 V Li||LiCoO2 Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-03-04 , DOI: 10.1002/aenm.202300084
Jiandong Liu ₁ , Mingguang Wu ₁ , Xin Li ₁ , Daxiong Wu ₁ , Huaping Wang ₁ , Junda Huang ₁ , Jianmin Ma ₁

Affiliation

Enhancing the charge cut-off voltage of LiCoO₂ at 4.6 V can improve the battery density, however, structural instability is a critical challenge (e.g., electrolyte decomposition, Co dissolution, and structural phase transition). Here, robust electrode electrolyte interphases (EEIs) with the high Li⁺ conductivity offered by polar amide groups and a Li₃N/LiF heterostructure is constructed. 3-(trifluoromethyl) phenyl isocyanate (3-TPIC) is rationally designed as an electrolyte additive for sustaining a 4.6 V Li||LiCoO₂ battery with such CEI, which can effectively address the challenge of structural instability. The polar amide group can achieve Li⁺ de-solvation and increase Li⁺ transport. Li₃N/LiF heterostructure in the cathode electrolyte interphase (CEI) can speed up the Li⁺ insertion/extraction for improving Coulombic efficiency and weakening polarization of LiCoO₂ at 4.6 V. In addition, the solid electrolyte interphase (SEI) with a similar structure on the Li anode surface contributes to the uniform Li deposition for suppressing the Li dendrite growth. As expected, 4.6 V Li||LiCoO₂ batteries with superior EEIs can deliver excellent electrochemical performance.

中文翻译：

用于 4.6 V Li||LiCoO2 电池的酰胺功能、富含 Li3N/LiF 的异质结构电极电解质界面

_{将 LiCoO 2}的充电截止电压提高到 4.6 V 可以提高电池密度，但是，结构不稳定性是一个关键挑战（例如，电解质分解、Co 溶解和结构相变）。在这里，构建了由极性酰胺基团和 Li _{3 N/LiF 异质结构提供的具有高 Li}⁺电导率的稳健电极电解质界面 (EEI) 。3-(三氟甲基)苯基异氰酸酯 (3-TPIC) 被合理设计为电解液添加剂，用于支持具有此类 CEI 的 4.6 V Li||LiCoO ₂电池，可有效解决结构不稳定的挑战。极性酰胺基可以实现Li ⁺去溶剂化，增加Li ⁺运输。正极电解质界面 (CEI) 中的Li ₃ N/LiF 异质结构可以加快 Li ^{+ 的插入/脱出，从而提高 LiCoO}₂在 4.6 V下的库仑效率和弱化极化。此外，固体电解质界面 (SEI) 具有类似的锂负极表面的结构有助于锂的均匀沉积，从而抑制锂枝晶的生长。正如预期的那样，具有出色 EEI 的4.6 V Li||LiCoO _{2电池可提供出色的电化学性能。}

更新日期：2023-03-04

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