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

doi:10.1016/j.jmst.2022.12.055

J. Mater. Sci. Technol. ›› 2023, Vol. 153: 32-40.DOI: 10.1016/j.jmst.2022.12.055

• Research Article • Previous Articles Next Articles

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

Kaiming Wang^a,b,1, Yifei Chen^a,1, Liang Zhang^a, Qihang Zhang^a, Zhi Cheng^a, Yining Su^a, Fei Shen^a,*, Xiaogang Han^a,c,d,*

^aState Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
^bSchool of Future Technology, Xi’an Jiaotong University, Xi’an 710049, China;
^cKey Laboratory of Smart Grid of Shaanxi Province, Xi’an, Xi’an 710049, China;
^dNational Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology, Xi’an 710049, China

Received:2022-10-11 Revised:2022-12-01 Accepted:2022-12-11 Published:2023-08-01 Online:2023-03-10
Contact: *State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi’an Jiaotong University, Shaanxi 710049, China. E-mail addresses: feishen@xjtu.edu.cn (F. Shen), xiaogang.han@xjtu.edu.cn (X. Han).
About author:¹These authors contributed equally to this work.

Abstract

Abstract: 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 traditional 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 reversible and stable lithiophilic layer LiC_x formed in situ by heating/pressing treatment provides abundant nucleation sites and reduces the Li nucleation overpotential, thereby effectively suppressing Li dendrite growth. Moreover, the volume change and pulverization problems of Li metal anode during deposition/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 stable 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.

Key words: Hot-pressing, Hybrid anode, Lithiophilic layer licx, Li dendrite, Solid-state batteries

Kaiming Wang, Yifei Chen, Liang Zhang, Qihang Zhang, Zhi Cheng, Yining Su, Fei Shen, Xiaogang Han. One step hot-pressing method for hybrid Li metal anode of solid-state lithium metal batteries[J]. J. Mater. Sci. Technol., 2023, 153: 32-40.

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

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