Surface-roughened current collectors for anode-free all-solid-state batteries

作     者：Donghee Gu Hyoungchul Kim Jong-Ho Lee Sangbaek Park Donghee Gu;Hyoungchul Kim;Jong-Ho Lee;Sangbaek Park

作者机构：Energy Materials Research CenterKorea Institute of Science and Technology(KIST)Seoul 02792.Republic of Korea School of CivilEnvironmental and Architectural EngineeringKorea University.Seoul 02841.Republic of Korea Division of Nanoscience and TechnologyUniversity of Science and Technology(UST)Seoul02792.Republicof Korea Department of Materials Science and EngineeringChungnam National UniversityDaejeon 34134.Republic of Korea 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第7期

页      面：248-257,I0007页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：supported by the Institutional Program(2E31852)of Korea Institute of Science and Technology(KIST) supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT,2022R1C1C1006019) 

主　　题：Anode-free Solid-state batteries Current collectors Surface roughness Li formation 

摘      要：Anode-free all-solid-state batteries(AFASSBs), composed of a fully lithiated cathode and a bare current collector(CC) that eliminates excess lithium, can maximize the energy density(because of a compact cell configuration) and improve the safety of solid-state systems. Although significant progress has been made by modifying CCs in liquid-based anode-free batteries, the role of CCs and the mechanism of Li formation on CCs in AFASSBs are still unexplored. Here, we systematically investigate the effect of the surface roughness of the CCs on the Li plating/stripping behavior in AFASSBs. The results show that the moderately roughened CC substantially improves the Coulombic efficiency and cycle stability of AFASSBs owing to the increased contact points between the solid electrolyte and the roughened CC. In contrast, the excessively roughened CC deteriorates the performance owing to the contact ***, an ex situ interface analysis reveals that the roughened surface of the CC could suppress the interfacial degradation during the Li ion extraction from a sulfide solid electrolyte to a CC. This provides an indication to the origin that hinders the electrochemical performance of AFASSBs. These findings show the potential for the application of surface-engineered CCs in AFASSBs and provide guidelines for designing advanced CCs.