Origin of fast charging in solid- state batteries revealed by Cryo-transmission X- ray microscopy

• 成果类型: Article
• 署名作者: Liu, Jiaxuan; Song, Yajie; Liu, Qingsong; Zhao, Wei; An, Hanwen; Zhou, Zinan; Xu, Zihan; Li, Menglu; Deng, Biao; Wang, Jiajun
• 署名单位: Harbin Institute of Technology; Harbin Institute of Technology; Harbin Institute of Technology; Harbin Institute of Technology; Chinese Academy of Sciences; Shanghai Institute of Applied Physics, CAS
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13629
• DOI: 10.1073/pnas.2410406121
• 发表日期: 2024-12-17
• 关键词: reaction-mechanisms; EVOLUTION; DYNAMICS; layers

摘要

The interface issue poses a limitation on the fast charging of solid- state batteries (SSBs), with the high- impedance non- Faraday electric field serving as a pivotal factor. However, the mechanism of fast- charging capability degradation triggered by the dynamic evolution of non- Faraday electric fields remains unclear due to the lack of particle- scale nondestructive detection techniques. Here, we dissect the generation and elimination processes of non- Faradaic electric field in segments using the developed operando cryogenic transmission X- ray microscopy (Cryo-TXM). This method accurately tracks the ion self- balancing pathways in LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) post- fast- charging, elucidating the high polarization during late charging caused by exacerbated irreversible local electric field. By intermittently applying reverse potential during fast charging to alleviate the exacerbation of non- Faradaic electric field at the cathode interface, we achieved a roughly 400% reversible capacity increase of SSBs at 10 C. This insightful dynamic imaging method effectively captures and resolves the transient, opaque signals within SSBs, significantly enhancing their fast- charging performance.