Open-Channel [011] Facet CeO2 with a Shorter Pathway of Li+ Migration as a Modification Material for LiNi0.8Co0.1Mn0.1O2 toward High-Rate Lithium-Ion Batteries,ACS Sustainable Chemistry & Engineering

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Open-Channel [011] Facet CeO2 with a Shorter Pathway of Li+ Migration as a Modification Material for LiNi0.8Co0.1Mn0.1O2 toward High-Rate Lithium-Ion Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-05-19 , DOI: 10.1021/acssuschemeng.0c02729
Yu Ma ₁ , Fei Lv ₂ , Zhiqiang Wang ₃ , Jing Feng ₁ , Mengtao Wu ₂ , Zhifang Liu ₁ , Li Chen ₁ , Yuzong Gu ₂

Affiliation

A stable interface is vital for the long cycling stability of nickel-rich material LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811). As such, the common remedy to improve the stability of nickel-rich layered oxide is to adopt a coating strategy. However, most of the coating materials used in this strategy are often randomly oriented, which may pose challenges toward efficient Li⁺ transportation from the electrolyte to the core material and vice versa. In this work, we demonstrate with the use of a CeO₂ shell with [011] exposed facets as a well-oriented coating material with a shorter straight Li⁺ migration pathway and higher electronic conductivity to further improve the stability and rate performance of the nickel-rich layered oxide. As a result, our CeO₂[011]-modified LiNi_0.8Co_0.1Mn_0.1O₂ (1.0%-NCM811) showed improved electrochemical performance, especially in terms of rate capability. Cycling stability was also enhanced for tests conducted at room temperature and at an elevated temperature of 55 °C. The higher rate performance by our 1.0%-NCM811 may stem from the open shorter channels available in the [011] facet and the higher electrical conductivity. Based on this work, the orientation of the coating material is crucial as it could affect the rate capability of the core material drastically.

中文翻译：

具有更短的Li ⁺迁移路径的开放通道[011]小平面CeO ₂作为面向高速率锂离子电池的LiNi _0.8 Co _0.1 Mn _0.1 O ₂的改性材料

稳定的界面对于富镍材料LiNi _0.8 Co _0.1 Mn _0.1 O ₂（NCM811）的长循环稳定性至关重要。因此，提高富镍层状氧化物稳定性的常用方法是采用涂层策略。但是，该策略中使用的大多数涂层材料通常都是随机取向的，这可能对从电解质到芯材的有效Li ⁺传输（反之亦然）提出挑战。在这项工作中，我们演示了使用具有[011]暴露小平面的CeO ₂壳作为定向良好的涂层材料，并具有较短的笔直Li ⁺迁移途径和更高的电子电导率，以进一步提高富镍层状氧化物的稳定性和倍率性能。结果，我们的CeO ₂ [011]改性的LiNi _0.8 Co _0.1 Mn _0.1 O ₂（1.0％-NCM811）显示出改善的电化学性能，特别是在速率能力方面。对于在室温和55°C的高温下进行的测试，循环稳定性也得到了增强。我们的1.0％-NCM811具有较高的速率性能，这可能是由于[011]小平面中可用的开放式较短通道以及较高的电导率。基于这项工作，涂层材料的取向至关重要，因为它可能会严重影响芯材的速率性能。

更新日期：2020-05-19

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