One step hot-pressing method for hybrid Li metal anode of solid-state lithium metal batteries  

作　　者：Kaiming Wang Yifei Chen Liang Zhang Qihang Zhang Zhi Cheng Yining Su Fei Shen Xiaogang Han 

机构地区：[1]State Key Laboratory of Electrical Insulation and Power Equipment,School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China [2]School of Future Technology,Xi’an Jiaotong University,Xi’an 710049,China [3]Key Laboratory of Smart Grid of Shaanxi Province,Xi’an,Xi’an 710049,China [4]National Innovation Platform(Center)for Industry-Education Integration of Energy Storage Technology,Xi’an 710049,China

出　　处：《Journal of Materials Science & Technology》2023年第22期32-40,共9页材料科学技术（英文版）

基　　金：supported by the National Key R&D Program of China (Grant No.2020YFA0710500);The authors acknowledge the basic scientific research business expenses Program of Xi’an Jiaotong University (Grant No.xzy022022053);the Independent Research Project of the State Key Laboratory of Electrical Insulation and Power Equipment (Grant No.EIPE23303)for financial support.

摘　　要：Safety issues induced by infinite anode volume change and uncontrolled lithium(Li)dendrite growth have become the biggest obstacle to the practical application of Li metal batteries.In addition,the tra-ditional rolling method makes it difficult to manufacture thin Li foil with high mechanical strength and low Li content.Herein,a three-dimensional(3D)lithophilic carbon paper/copper(Cu)current collector hybrid anode with ultra-low Li metal content is prepared by a hot-pressing method.The highly re-versible and stable lithiophilic layer LiC_(x) formed in situ by heating/pressing treatment provides abun-dant nucleation sites and reduces the Li nucleation overpotential,thereby effectively suppressing Li den-drite growth.Moreover,the volume change and pulverization problems of Li metal anode during depo-sition/stripping also can be accommodated by the 3D skeleton.The optimization effect has been directly confirmed by in-situ optical and ex-situ scanning electron microscope observation.Therefore,highly sta-ble performance(158.4 mA h g^(-1) at 2 C after 200 cycles with a capacity retention of 95.24%)in Li@LCP-Cu||NCM811 coin cell can be achieved.Furthermore,the solid-state battery assembled with the hybrid anode,poly(vinylidene fluoride)(PVDF)-based polymer electrolyte and polyethylene oxide(PEO)interface functional layer also exhibits the best electrochemical and safety performance,which also proves that the Li@LCP-Cu anode has great potential for application in solid-state batteries.

关 键 词：HOT-PRESSING Hybrid anode Lithiophilic layer licx Li dendrite Solid-state batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TG146.26[一般工业技术—材料科学与工程]