Li4Ti5O12-TiO2 composite coating layer enabling LiNi0.8Co0.1Mn0.1O2 electrodes with superior cycling performance

Huang, Kai; Yang, Huili; Xie, Tianzheng; Zhou, Jinxia; Lan, Tu; Ong, Suichang; Jiang, Heng; Zeng, Yibo; Wan, Linyi; Guo, Hang; Zhang, Ying

doi:10.1016/j.jelechem.2023.117923

Cited by 5 publications

(1 citation statement)

References 60 publications

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“…Moreover, side reactions occurring at the interface between sulfide-based SEs and NCMs contribute to increased internal resistance and reduced ion conductivity, resulting in deterioration of the cycling performance. To address these challenges, surface coating of NCM materials with protective layers, such as Li 4 Ti 5 O 12 , LiTaO 3 , Li 3 PO 4 , lithium phosphorus oxynitride (LiPON), and LiNbO 3 , has been performed. − Among these protective layers, LiNbO 3 is widely used due to its chemical stability and relatively high Li ionic conductivity (10 –5 –10 –6 S cm –1 ). − Despite numerous reports indicating the improvement in the battery performance of ASSBs through surface coating, the mechanism underlying these enhancements is not fully understood. A deep understanding of the interactions between SEs and cathodes is crucial.…”

Section: Introductionmentioning

confidence: 99%

Selection of Surface Coating Materials for Ni-Rich NCM in All-Solid-State Batteries through Electronic Band Structure Analysis Using UPS/LEIPS

Terashima,

Mamiya,

Kimoto

et al. 2024

J. Phys. Chem. C

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In recent years, all-solid-state batteries (ASSBs) have garnered significant interest as next-generation batteries for electric vehicles and renewable energy storage. Among the various cathode materials explored for ASSBs, Ni-rich-layered oxides, primarily composed of Ni, Co, and Mn (NCMs), have emerged as promising candidates, especially when combined with sulfide-based solid electrolytes (SEs). However, as the Ni content in NCMs increases, their capacity rises, while their cycling stability decreases. Moreover, the side interactions between NCMs and sulfide-based SEs lead to interface instability, which impedes the efficient transport of Li ions. Researchers have explored surface coatings, such as LiNbO3, as a protective layer on NCMs, aiming to mitigate undesirable interactions. Despite the observed improvements in battery performance, the mechanisms underlying the enhancement via surface coating remain unclear. In this study, we investigated the electronic band structures of the NCMs and Li10GeP2S12 (LGPS), a sulfide-based SE, to predict side reactions occurring at the interface upon their junction. Based on experimental results, we will discuss the solid–solid interactions between them and the properties required for surface coatings to suppress side reactions.

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