Assembly of an Elastic & Sticky Interfacial Layer for Sulfide-Based All-Solid-State Batteries

作     者：Su, Yu Liu, Xiangsi Yan, Hao Zhao, Jun Cheng, Yong Luo, Yu Gu, Jiabao Zhong, Haoyue Fu, Ang Wang, Kangjun Wang, Mingsheng Huang, Jianyu Yan, Jiawei Yang, Yong 

作者机构：State Key Laboratory for Physical Chemistry of Solid Surface Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China Pen-Tung Sah Institute of Micro-Nano Science and Technology College of Materials Xiamen University Xiamen361005 China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China 

出 版 物：《SSRN》 

年 卷 期：2023年

核心收录：

主　　题：Solid electrolytes 

摘      要：All-solid-state lithium-ion batteries (ASSLBs) have recently attracted significant attention, however, two major degradation processes at the composite cathode interface in ASSLBs, including side electro-chemical reactions and morphological/structural degradation, still hinder their development seriously. To overcome the above two challenges simultaneously, we propose and demonstrate a successful assembly of an elastic & sticky interfacial layer for ASSLBs by using advanced molecular layer deposition (MLD) technique. Our spectroscopic and mechanical characterization results show that the elastic and sticky Al-GL coating layer (Young’s modulus = 0.17GPa, k = 3.300 N m-1) not only suppresses interfacial side reactions, but also enables single-crystal NCM811 particles to be in close contact with the sulfide electrolyte tightly during repeated cycles. Compared to the irreversible interfacial resistance (51.74 Ω cm-2) formed between bare NCM811 and solid electrolyte during the initial charge progress, the irreversible resistance becomes much less (11.77 Ω cm-2) after Al-GL modification. Therefore, it not only shows a capacity retention of 88.0 % of the composite electrode, which is nearly 30 % higher than bare NCM811 (59.9 %) for 100 cycles at 0.2C (1C =180 mA g-1) with a mass loading of 10.2 mg cm-2 at 30 °C. Furthermore, even with a mass loading of 20.4 mg cm-2 at 60 °C, the capacity retention of 80.0 % is obtained after 1000 cycles at 1C. This work highlights the critical role of elastic and sticky coatings in maintaining the electrochemical-mechanical integrity of composite cathode materials and provides a promising avenue for developing mechanically reliable cathode materials for ASSLBs. © 2023, The Authors. All rights reserved.