Protection of Cobalt-Free LiNiO2 from Degradation with Localized Saturated Electrolytes in Lithium-Metal Batteries,ACS Energy Letters

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Protection of Cobalt-Free LiNiO2 from Degradation with Localized Saturated Electrolytes in Lithium-Metal Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-06-01 , DOI: 10.1021/acsenergylett.2c01081
Laisuo Su ₁ , Eunmi Jo ₁ , Arumugam Manthiram ₁

Affiliation

High-nickel layered oxide cathode materials are the most promising candidates for developing lithium-metal batteries (LMBs) because of their high energy density and low cost. Herein, we present a localized saturated electrolyte (LSE) based on readily available, low-cost LiPF₆ salt with limited solubility in carbonate solvents for developing LiNiO₂ cathodes. Compared to the conventional electrolyte that retains only 55% of the initial capacity after 200 cycles, the LSE retains a record 81% of the initial capacity after 600 deep cycles at 4.4 V (versus Li/Li⁺). The LSE protects the LiNiO₂ surface from degrading into rock-salt and spinel phases during cycling and helps form a robust Li morphology on the Li-metal anode that is covered by an inorganic-rich solid-electrolyte interphase. The drastically enhanced cycling stability with LSE demonstrates the importance of developing robust electrolytes compatible with both high-Ni cathodes and Li-metal anodes.

中文翻译：

锂金属电池中局部饱和电解质防止无钴 LiNiO2 降解

高镍层状氧化物正极材料因其高能量密度和低成本而成为开发锂金属电池（LMB）最有希望的候选材料。在此，我们提出了一种基于易于获得、低成本的 LiPF ₆盐的局部饱和电解质 (LSE)，该盐在碳酸盐溶剂中的溶解度有限，用于开发 LiNiO ₂正极。与传统电解液在 200 次循环后仅保留 55% 的初始容量相比，LSE 在 4.4 V 的 600 次深循环后保留了创纪录的 81% 的初始容量（相对于 Li/Li ⁺）。LSE 保护 LiNiO ₂在循环过程中表面不会降解成岩盐和尖晶石相，并有助于在锂金属负极上形成坚固的锂形态，该负极被富含无机物的固体电解质界面覆盖。LSE 显着提高的循环稳定性证明了开发与高镍正极和锂金属负极兼容的稳健电解质的重要性。

更新日期：2022-06-01

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