As one of the most promising cathodes for next-generation lithium ion batteries (LIBs), Li-rich materials have been extensively investigated for their high energy densities. However, the practical application of Li-rich cathodes is extremely retarded by the sluggish electrode-electrolyte interface kinetics and structure instability. In this context, piezoelectric LiTaO3 is employed to functionalize the surface of Li1.2Ni0.17Mn0.56Co0.07O2 (LNMCO), aiming to boost the interfacial Li+ transport process in LIBs. The results demonstrate that the 2 wt% LiTaO3-LNMCO electrode exhibits a stable capacity of 209.2 mAh g-1 at 0.1 C after 200 cycles and 172.4 mAh g-1 at 3 C. Further investigation reveals that such superior electrochemical performances of the LiTaO3 modified electrode results from the additional driving force from the piezoelectric LiTaO3 layer in promoting Li+ diffusion at the interface, as well as the stabilized bulk structure of LNMCO. The supplemented LiTaO3 layer on the LNMCO surface herein, sheds new light on the development of better Li-rich cathodes toward high energy density applications.

中文翻译：

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压电 LiTaO3 改性富锂阴极-电解质界面处的局部电场驱动的快速锂扩散动力学。

作为下一代锂离子电池（LIB）最有前途的阴极之一，富锂材料因其高能量密度而受到广泛研究。然而，由于电极-电解质界面动力学缓慢和结构不稳定，富锂正极的实际应用受到极大阻碍。在此背景下，采用压电LiTaO3对Li1.2Ni0.17Mn0.56Co0.07O2 (LNMCO)的表面进行功能化，旨在促进LIB中的界面Li+传输过程。结果表明，2 wt% LiTaO3-LNMCO 电极在 200 次循环后在 0.1 C 下表现出 209.2 mAh g-1 的稳定容量，在 3 C 下表现出 172.4 mAh g-1 的稳定容量。进一步的研究表明，LiTaO3 改性的这种优异的电化学性能电极的产生源于压电LiTaO3层促进Li+在界面扩散的额外驱动力，以及LNMCO稳定的体结构。LNMCO 表面上的补充 LiTaO3 层为开发更好的富锂阴极以实现高能量密度应用提供了新的思路。