Huang Shaobo, Zhang Hao, Fan Li-Zhen
College of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China.
Research Institute of Chemical Defense, Beijing Key Laboratory of Advanced Chemical Energy Storage Technology and Materials, Beijing 100191, China.
ACS Appl Mater Interfaces. 2022 Apr 20;14(15):17539-17546. doi: 10.1021/acsami.2c02631. Epub 2022 Apr 11.
Constructing a composite lithium anode with a rational structure has been considered as an effective approach to regulate and relieve the tough problems of a sparkling Li anode. However, the potential short circuits risk that Li deposition at the surface of the framework has not yet been resolved. Here, we present a simple regulating-deposition strategy to guide the preferentially bottom-up deposition/growth of Li. The triple-gradient structure of modified porous copper with electrical passivation (top) and chemical activation (bottom) shows significant improvements in the morphological stability and electrochemical performance. Meanwhile, the generation of LiSe can as an advanced artificial SEI layer be devoted to homogeneous Li plating/stripping. As a result, the composite anode exhibits a long-term cycling over 250 cycles with a high average CE of 98.2% at 1 mA cm. Furthermore, a capacity retention of 94.4% in full cells can be achieved when pairing with LiFePO as the cathode. These results ensure a bright direction for developing high-performance Li metal anodes.
