Li3N-Modified Garnet Electrolyte for All-solid-state Li-metal Batteries Operated at 40 ºC.
Authors of this article are:
Xu H, Li Y, Zhou A, Wu N, Xin S, Li Z, Goodenough JB.
A summary of the article is shown below:
Lithium carbonate on the surface of garnet blocks Li+ conduction and causes a huge interfacial resistance between the garnet and electrode. To solve this problem, this study presents an effective strategy to reduce significantly the interfacial resistance by replacing Li2CO3 with Li-ion conducting Li3N. Compared to the surface Li2CO3 on garnet, Li3N is not only a good Li+ conductor, but also offers a good wettability with both the garnet surface and a lithium-metal anode. In addition, the introduction of a Li3N layer not only enables a stable contact between the Li anode and garnet electrolyte, but also prevents the direct reduction of garnet by Li metal over a long cycle life. As a result, a symmetric lithium cell with this Li3N-modified garnet exhibits an ultralow overpotential and stable plating/stripping cyclability without lithium dendrite growth at room temperature. Moreover, an all-solid-state Li/LiFePO4 battery with a Li3N-modified garnet also displays high cycling efficiency and stability over 300 cycles even at a temperature of 40 ºC.
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