All-solid-state sulfide-based lithium-metal batteries are promising candidates for energy storage systems. However, problems associated with undesirable reactions and contact failure at the anode interface have hindered their commercialization.
Here,Wu Feng, Mu Daobin and others of Beijing Institute of TechnologyThrough a viable pre-lithiation pathway, indium foil is imbued with a molded interlayer with a surface rich in LIF and lithium indium alloys. The lithiation alloy of the intermediate layer can act as a lithium reservoir to regulate the Li+ flux and charge distribution, which is conducive to the uniform deposition of lithium. At the same time, it also inhibits the reductive decomposition of Li6PS5Cl electrolyte and maintains sufficient solid-solid contact. The in-situ impedance map shows that the interface achieves a constant interfacial impedance and fast charge transfer.
In addition, the negative electrode can also be used at 2Lithium stripping deposition at 55 mA cm-2 for more than 2000 hours, all-solid-state batteries with lithium cobalt oxide cathode and pre-indium anode can be degraded at 0More than 700 cycles at 5 C with a capacity retention rate of 9615%。
Figure 1Characterization of interfacial structure
In summary, this work generates a multifunctional interlayer film on its surface through pre-lithiation of indium, thus achieving ideal interfacial compatibility between the anode and LPSCL. As lithium reservoirs, the middle and main layers within the pre in are able to regulate the Li+ flux and charge distribution and inhibit dendrite growth. The interface has a LIF and alloy-rich surface layer that protects the LPSCl SE from side reactions and maintains tight interfacial contact.
In-situ impedance spectroscopy combined with DRT technology shows that this versatile interface favors constant interfacial resistance and fast charge transfer. So, in 2At a high current density of 55 mA cm-2, the pre-in symmetrical cell did not undergo a short circuit during 2000 hours of lithium stripping and deposition, indicating excellent electrochemical stability between the pre-in anode and LPSCL. In all-solid-state batteries, a custom pre in can make the lithium cobalt oxide cathode 0Operates at a rate of 5 C and maintains 96 over 700 cycles15% of the best capacity.
Figure 2Full battery performance
toward ultrastable metal anode/li6ps5cl interface via an interlayer as li reservoir，nano letters2023 doi: 10.1021/acs.nanolett.3c03047