Solid‐state batteries (SSBs) promise high energy density and strong safety due to using nonflammable solid‐state electrolytes (SSEs) and high‐capacity Li metal anode. Ta‐substituted Li7La3Zr2O12 (LLZT) SSE possesses superior ionic conductivity and stability with Li metal, yet the interfacial compatibility and lithium dendrite hazards still hinder its applications. Herein, an interfacial engineering is demonstrated by facile acid‐salt (AS) treatment on LLZT, constructing a 3D cross‐linking LiF‐LiCl (CF) network. Such structure facilitates Li wetting via capillary permeation. Notably, CF as electronically insulting phases block the electrons through the interface and ulteriorly suppress the dendrite formation. The assembled Li symmetric cell exhibited a low interfacial impedance (11.6 Ω cm2) and high critical current densities (CCDs) in the time‐constant mode, 1.8 mA cm−2 at 25 °C and 3.6 mA cm−2 at 60 °C, respectively. Meanwhile, by exploring the capacity‐constant mode of CCD measurement, the concept of critical areal capacity (CAC) is first proposed, obtaining its values of ≈0.5 mAh cm−2 at 25 °C and 1.2 mAh cm−2 at 60 °C. Moreover, the safety‐enhanced hybrid SSBs matched with LiFePO4 and LiNi0.6Co0.2Mn0.2O2 deliver a remarkable rate and cycling performances, validating the feasibility of this interfacial engineering in various SSB systems.
Recently, lateral flow assay (LFA) for nucleic acid detection has drawn increasing attention in the point-of-care testing fields. Thanks to its rapidity, easy implementation, and low equipment requirement, it is...
Ultrathin composite solid‐state electrolytes (CSSEs) demonstrate great promise in high‐energy‐density solid‐state batteries due to their ultrathin thickness and good adaptability to lithium metal anodes. However, uncontrolled dendrite growth and performance deterioration caused by the aggregation of inorganic powder restrict the practical application of ultrathin CSSEs. Herein, a flexible, self‐supporting Li6.5La3Zr1.5Ta0.5O12 (LLZO) ceramic skeleton is prepared by the tape‐casting method. Subsequently, a 12 µm‐thick CSSE with a 3D interconnection structure is achieved through in situ UV curing of ethoxylated trimethylolpropane triacrylate (ETPTA) in a ceramic skeleton (CS‐CSSE). This design includes a sintered LLZO ceramic, which can avoid the uneven distribution of the inorganic phase and regulate ion migration. Meanwhile, the cross‐linked ETPTA polymer electrolyte contributes to lower interfacial impedance. In addition, the continuous two‐phase interface can also provide a fast transmission channel for Li+. As a result, CS‐CSSE demonstrates superior Li+ transference number (0.83) and ionic conductivity (1.19 × 10‐3 S cm‐1) at 25 °C. As‐prepared Li|LiNi0.83Co0.12Mn0.05O2 batteries exhibit high discharge specific capacities of 185.4 mAh g‐1 at 0.1 C and average coulombic efficiency greater than 99%. The pouch cells exhibit high energy densities of 376 Wh Kg‐1 and 1186 Wh L‐1. This work provides new insights into the application of ceramics to high‐energy‐density solid‐state batteries.
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