Regulating Li electrodeposition by constructing Cu-Sn nanotube thin layer for reliable and robust anode-free all-solid-state batteries  

作　　者：Jaeik Kim Seungwoo Lee Jeongheon Kim Joonhyeok Park Hyungjun Lee Jiseok Kwon Seho Sun Junghyun Choi Ungyu Paik Taeseup Song 

机构地区：[1]Department of Energy Engineering,Hanyang University,Seoul,Republic of Korea [2]School of Chemical Engineering,Yeungnam University,Gyeongsan,Republic of Korea [3]School of Chemical,Biological and Battery Engineering,Gachon University,Seongnam,Republic of Korea [4]Department of Battery Engineering,Hanyang University,Seoul,Republic of Korea

出　　处：《Carbon Energy》2024年第12期283-297,共15页碳能源(英文)

基　　金：Korea Institute of Energy Technology Evaluation and Planning,Grant/Award Number:20214000000520;Ministry of Trade,Industry and Energy,Grant/Award Number:20009985。

摘　　要：Anode-free all-solid-state batteries(AF-ASSBs)have received significant attention as a next-generation battery system due to their high energy density and safety.However,this system still faces challenges,such as poor Coulombic efficiency and short-circuiting caused by Li dendrite growth.In this study,the AF-ASSBs are demonstrated with reliable and robust electrochemical properties by employing Cu-Sn nanotube(NT)thin layer(~1μm)on the Cu current collector for regulating Li electrodeposition.Li_(x)Sn phases with high Li-ion diffusivity in the lithiated Cu-Sn NT layer enable facile Li diffusion along with its one-dimensional hollow geometry.The unique structure,in which Li electrodeposition takes place between the Cu-Sn NT layer and the current collector by the Coble creep mechanism,improves cell durability by preventing solid electrolyte(SE)decomposition and Li dendrite growth.Furthermore,the large surface area of the Cu-Sn NT layer ensures close contact with the SE layer,leading to a reduced lithiation overpotential compared to that of a flat Cu-Sn layer.The Cu-Sn NT layer also maintains its structural integrity owing to its high mechanical properties and porous nature,which could further alleviate the mechanical stress.The LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM)|SE|Cu-Sn NT@Cu cell with a practical capacity of 2.9 mAh cm^(−2) exhibits 83.8%cycle retention after 150 cycles and an average Coulombic efficiency of 99.85%at room temperature.It also demonstrates a critical current density 4.5 times higher compared to the NCM|SE|Cu cell.

关 键 词：all-solid-state battery anode-free Coble creep mechanism Cu-Sn nanotube sulfide-based solid electrolyte 

分 类 号：TM912[电气工程—电力电子与电力传动] TB306[一般工业技术—材料科学与工程]