Abstract
In this paper an innovative method to improve the contact state between Li metal and LLZTO solid electrolyte surface is presented. Based on the interdiffusion between Cu and Zr elements, the Cu mesh coated with Ag layer (ACM) is welded on the LLZTO ceramic surface at 3 MPa pressure for 30 min at 900 °C under Ar atmosphere. The molten Li metal wets and spreads on the LLZTO solid electrolyte surface with the assistance of the ACM fixed on the ceramic surface. As a result, the interfacial resistance between the Li metal anode and the LLZTO solid electrolyte surface is reduced from 2869.05 Ω·cm2 to 34.1 Ω·cm2. Moreover, the ACM can guide the Li metal into an orderly deposition to enhance the stability of the Li/LLZTO interface. The ACM divides the Li plating/stripping space into several small areas, similar to forming several independent small units in a large system. This division reduces the risk and probability of uneven Li plating/stripping space in the entire system. Therefore, the Li/100ACM-LLZTO /Li symmetric cell can operate stably for 800 h at 0.1 mA/cm2. And the Li/100ACM-LLZTO/LFP full cell still has a capacity retention rate of 81% after 300 cycles at 0.5C.
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