Building a Self-Adaptive Protective Layer on Ni-Rich Layered Cathodes to Enhance the Cycle Stability of Lithium-Ion Batteries,Advanced Materials

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Building a Self-Adaptive Protective Layer on Ni-Rich Layered Cathodes to Enhance the Cycle Stability of Lithium-Ion Batteries
Advanced Materials ( IF 27.4 ) Pub Date : 2022-08-02 , DOI: 10.1002/adma.202204835
Hua Yang ₁ , Rui-Min Gao ₁ , Xu-Dong Zhang ₂ , Jia-Yan Liang ₂ , Xin-Hai Meng ₂ , Zhuo-Ya Lu ₂ , Fei-Fei Cao ₁ , Huan Ye ₁

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Layered Ni-rich lithium transition metal oxides are promising battery cathodes due to their high specific capacity, but their poor cycling stability due to intergranular cracks in secondary particles restricts their practical applications. Surface engineering is an effective strategy for improving a cathode's cycling stability, but most reported surface coatings cannot adapt to the dynamic volume changes of cathodes. Herein, a self-adaptive polymer (polyrotaxane-co-poly(acrylic acid)) interfacial layer is built on LiNi_0.6Co_0.2Mn_0.2O₂. The polymer layer with a slide-ring structure exhibits high toughness and can withstand the stress caused by particle volume changes, which can prevent the cracking of particles. In addition, the slide-ring polymer acts as a physicochemical barrier that suppresses surface side reactions and alleviates the dissolution of transition metallic ions, which ensures stable cycling performance. Thus, the as-prepared cathode shows significantly improved long-term cycling stability in situations in which cracks may easily occur, especially under high-rate, high-voltage, and high-temperature conditions.

中文翻译：

在富镍层状阴极上构建自适应保护层以增强锂离子电池的循环稳定性

层状富镍锂过渡金属氧化物因其高比容量而成为有前途的电池正极，但由于二次粒子的晶间裂纹导致其循环稳定性差，限制了其实际应用。表面工程是提高正极循环稳定性的有效策略，但大多数报道的表面涂层不能适应正极的动态体积变化。_{本文在LiNi 0.6} Co _0.2 Mn _0.2 O ₂上构建了一个自适应聚合物（聚轮烷-共聚丙烯酸）界面层。. 具有滑环结构的聚合物层具有很高的韧性，可以承受颗粒体积变化引起的应力，可以防止颗粒开裂。此外，滑环聚合物作为一种物理化学屏障，可抑制表面副反应并减轻过渡金属离子的溶解，从而确保稳定的循环性能。因此，在容易发生裂纹的情况下，特别是在高倍率、高电压和高温条件下，所制备的正极显示出显着改善的长期循环稳定性。

更新日期：2022-08-02

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