期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202001973
关键词
dendrite-free Li anodes; hierarchical 3D networks; high areal capacity; solid state electrolyte; Li metal batteries
类别
资金
- National Natural Science Foundation of China [51872027]
- National Key R&D Program of China [2018YFB0104300]
- Beijing Natural Science Foundation [L172023]
A carbonized metal-organic framework (MOF) nanorod arrays modified carbon cloth (NRA-CC) has been developed for uniform Li plating/stripping in solid-state Li metal batteries. This electrode effectively suppresses Li dendrite growth and improves cycling stability and Coulombic efficiency.
Li metal is one of the most promising anode materials for high energy density batteries. However, uncontrollable Li dendrite growth and infinite volume change during the charge/discharge process lead to safety issues and capacity decay. Herein, a carbonized metal-organic framework (MOF) nanorod arrays modified carbon cloth (NRA-CC) is developed for uniform Li plating/stripping. The carbonized MOF NRAs effectively convert the CC from lithiophobic to lithiophilic, decreasing the polarization and ensuring homogenous Li nucleation. The 3D interconnected hierarchal CC provides adequate Li nucleation sites for reducing the local current density to avoid Li dendrite growth, and broadens internal space for buffering the volume change during Li plating/stripping. These characteristics afford a stable cycling of the NRA-CC electrode with ultrahigh Coulombic efficiencies of 96.7% after 1000 h cycling at 2 mA cm(-2) and a prolonged lifespan of 200 h in the symmetrical cell under ultrahigh areal capacity (12 mAh cm(-2)) and current (12 mA cm(-2)). The solid-state batteries assembled with the composite Li anode, high-voltage cathode (LiNi0.5Co0.2Mn0.3O2), and composite solid-state electrolyte also deliver excellent cyclic and rate performance at 25 degrees C. This work sheds fresh insights on the design principles of a dendrite-free Li metal anode for safe solid-state Li metal batteries.
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