Nanoscale operation of Ni-Rich cathode surface by polycrystalline solid electrolytes Li3.2Zr0.4Si0.6O3.6 coating

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-08, Vol.417, p.129217, Article 129217
• Main Authors: Li, Jianying, Yang, Maoxia, Huang, Zechuan, Zhao, Baiqing, Zhang, Gen, Li, Shaomin, Cui, Yanhua, Dong, Zhaohui, Liu, Hao
• Format: Article
• Language: English
• Subjects: LiNi0.8Co0.15Mn0.05O2; Lithium ion batteries; Nanoscale polycrystalline Li3.2Zr0.4Si0.6O3.6; Nickel-rich oxides; Solid state electrolyte; Surface coating
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2021.129217

The nanoscale polycrystalline of solid electrolyte Li3.2Zr0.4Si0.6O3.6 coating is used to enhance the electrochemical performances of LiNi0.8Co0.15Mn0.05O2 (NCM) for lithium-ion batteries. [Display omitted] •NP-LZSO coating layer was quantitatively analyzed to study the impact of NCM.•NP-LZSO coated NCM was synthesized by simple chemical approach.•NP-LZSO coating approach remarkably improves the NCM cycling stability.•Phase transformation is effectively suppressed by NP-LZSO. As nickel-rich cathodes materials begin to attract immense attentions for its ultra-high capacity for Li-ion batteries (LIBs), their cycling stability remains insufficient for electric vehicles. Surface coating is regarded as an efficient approach in the enhancement of Ni-rich cathodes. Unfortunately, surface modification of cathode via a simple and effective way is still great challenges. Here we report a facile one-step chemical approach using nanoscale polycrystalline of solid electrolyte Li3.2Zr0.4Si0.6O3.6 (NP-LZSO) to build a conductive protective coating on Ni-rich cathode LiNi0.8Co0.15Mn0.05O2 (NCM). The NP-LZSO coating layer facilitates the transportation of Li-ions, significantly suppresses the undesired side reactions in cycling process, and effectively stabilizes the electrolyte-NCM interface. This approach remarkably improves the cycling stability with a capacity retention rate of 79.9% over 400 cycles at 0.2C. This effective strategy provides a new insight using nanoscale polycrystalline of solid electrolyte to modify surface of nickel-rich cathodes to improve its cyclic performance.