Extensively Reducing Interfacial Resistance by the Ultrathin Pt Layer between the Garnet-Type Solid-State Electrolyte and Li-Metal Anode
Journal
ACS Applied Materials and Interfaces
Journal Volume
13
Journal Issue
47
Pages
56181-56190
Date Issued
2021
Author(s)
Abstract
All-solid-state Li-ion batteries (ASSLIBs), also known as next-generation batteries, have attracted much attention due to their high energy density and safety. The best advantage of ASSLIBs is the Li-metal anodes that could be used without safety issues. In this study, a highly conductive garnet solid electrolyte (Li6.75La3Zr1.75Ta0.25O12, LLZTO) was used in the ASSLIB, and a Pt film was used to modify the surface of LLZTO to prove the solution of the Li-metal anode for LLZTO. Li-Pt alloy was synthesized to improve the wettability and contact of the interface. The interfacial resistance was reduced by 21 times, at only 9 ω cm2. The symmetric cell could stably cycle over 3500 h at a current density of 0.1 mA cm-2. The full cell of Li|Li-Pt|LLZTO|LiFePO4 and Li|Li-Pt|LLZTO|LiMn0.8Fe0.2PO4 achieved high stability in terms of battery performance. Point-to-point contact transformed into homogeneous surface contact made the Li-ion flux faster and more stable. This surface modification method could provide researchers with a new choice for fixing interface issues and promoting the application of high-performance ASSLIBs in the future. ? 2021 American Chemical Society.
Subjects
Li-Pt alloy
Li6.75La3Zr1.75Ta0.25O12
lithiumphilic
solid-state Li-ion batteries
Anodes
Garnets
Ions
Lithium alloys
Lithium compounds
Lithium-ion batteries
Platinum alloys
Point contacts
Solid electrolytes
All-solid state
Higher energy density
Interfacial resistances
Li metal
Li6.75la3zr1.75ta0.25O12
Lithiumphilic
Metal anodes
Solid-state electrolyte
Solid-state li-ion battery
Ultra-thin
Binary alloys
SDGs
Type
journal article