Conductive Li+ Moieties-Rich Cathode Electrolyte Interphase with Electrolyte Additive for 4.6 V Well-Cycled Li||LiCoO2 Batteries,Advanced Energy Materials

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Conductive Li+ Moieties-Rich Cathode Electrolyte Interphase with Electrolyte Additive for 4.6 V Well-Cycled Li||LiCoO2 Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-04-07 , DOI: 10.1002/aenm.202204272
Kanglong Guo ₁ , Chunlei Zhu ₁ , Huaping Wang ₁ , Shihan Qi ₁ , Junda Huang ₁ , Daxiong Wu ₁ , Jianmin Ma ₁

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Increasing the cut-off voltage of cathodes can improve the energy density of Li||LiCoO₂ batteries. However, the electrolyte and cathode suffer from oxidation and deterioration at high voltage, respectively, which lead to rapid battery degradation. Herein, a uniform, highly Li⁺ conductive cathode electrolyte interphase (CEI) is constructed by using bis-(benzenesulfonyl)imide (BBSI) as an additive to stabilize Li||LiCoO₂ batteries at 4.6 cut-off voltage with superior cycling and high-rate performance. Such a CEI is comprised of LiF and conductive Li⁺ moieties (e.g., Li₂S and Li₃N), which can improve the Li⁺ migration, alleviate cathode degradation, and other secondary degradation factors caused by uneven local Li⁺ intercalation/deintercalation. As expected, Li||LiCoO₂ batteries with a 1% BBSI-containing electrolyte sustain 81.30% of initial capacity after 300 cycles at 0.5C, and 88.27% of initial capacity even after 500 cycles at 2C/3C.

中文翻译：

用于 4.6 V 良好循环 Li||LiCoO2 电池的富含电解质添加剂的导电 Li+ 部分阴极电解质界面

提高正极的截止电压可以提高Li||LiCoO ₂电池的能量密度。然而，电解质和阴极分别在高电压下发生氧化和劣化，导致电池快速退化。在此，通过使用双（苯磺酰基）亚胺（BBSI）作为添加剂构建均匀、高 Li + 导电的阴极电解质界面（CEI），以将 Li||LiCoO 2 电池稳定^在4.6_的截止电压，具有优异的循环和高- 速率性能。这种 CEI 由 LiF 和导电 Li ⁺部分（例如 Li ₂ S 和 Li ₃ N）组成，可以提高 Li ⁺^{迁移，减轻正极退化，以及其他由不均匀的局部 Li +}嵌入/脱嵌引起的二次退化因素。正如预期的那样，使用含 1% BBSI 的电解质的 Li||LiCoO 2 电池在 0.5C 下循环 300 次后仍可保持 81.30% 的初始容量，即使在 2C/3C 下循环 500 次后也能保持 88.27% 的初始容量_。

更新日期：2023-04-07

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