Impact of thermal treatment on the Li-ion transport, interfacial properties, and composite preparation of LLZO garnets for solid-state electrolytes

Abstract

Heat treatment of LLZO garnets can effectively remove lithium hydroxide and carbonate layers from its surface, increase the Li dynamics in the structure and improve the processing of composite polymer electrolytes for solid-state batteries.

Two-step cold sintering of Li1.3Al0.3Ti1.7(PO4)3 composite solid electrolyte with non-equilibrium microstructures for enhanced electrochemical performance

“…The precipitation of LiTFSI efficiently fills gaps in the solid-electrolyte, increasing its density and minimizing the isolation of internal pores for enhanced ion transport. 33 By calculating the mass fraction based on the atomic ratio of carbon, the LiTFSI content in the solid-state electrolyte is determined to be approximately 18%, which closely matches the amount added during the CSP.…”

In Situ Fabrication of High Ionic and Electronic Conductivity Interlayers Enabling Long-Life Garnet-Based Solid-State Lithium Batteries

“…53−55 These peaks also indicate the weak crystallinity of carbon, predominantly in an amorphous state. The peak near 379 cm −1 corresponds to Li 2 S, 56 while peaks at 661 and 739 cm −1 are related to LLZTO, 57 and a peak near 1090 cm −1 corresponds to Li 2 CO 3 . 57 The HRTEM image of the Li 2 S@C interface layer shown in Figure 2c reveals a lattice spacing of 0.287 nm, corresponding to the (200) plane of Li 2 S (PDF# 23-0369).…”

“…The peak near 379 cm −1 corresponds to Li 2 S, 56 while peaks at 661 and 739 cm −1 are related to LLZTO, 57 and a peak near 1090 cm −1 corresponds to Li 2 CO 3 . 57 The HRTEM image of the Li 2 S@C interface layer shown in Figure 2c reveals a lattice spacing of 0.287 nm, corresponding to the (200) plane of Li 2 S (PDF# 23-0369). The elemental linear distribution result in EDS linear scanning mode at the interface of the LLZTO substrate and the Li 2 S@C layer is shown in Figure 2d, indicating that C and S elements are enriched in the Li 2 S@C layer, implying that the interface phases are major Li 2 S and minor phases of C reacting with LLZTO.…”

Porous Ga0.25Li6.25La3Zr2O12 frameworks by gelcasting–reaction sintering for high-performance hybrid quasi-solid lithium metal batteries

“…In the second temperature range of 680–860 °C, the total weight losses are approximately 16.5%, which is due to the emission of CO 2 caused by the decomposition of Li 2 CO 3 and La 2 O 2 CO 3 at high temperature. 34–36 The cross-section SEM images of GLLZO frameworks sintered at various temperatures are shown in Fig. 2(a)–(h).…”