Work

Cold Sintering of LLTO Composite Electrolytes for Solid‐State Lithium Batteries

Year: 2024

Type: article

Abstract: Solid‐state batteries have the potential for higher energy densities and enhanced safety when compared to conventional lithium‐ion batteries. The perovskite‐type Li 3x La 2/3–x TiO 3 (LLTO) is an attractive ceramic electrolyte due to its high ionic conductivity, broad electrochemical stability window, and thermal and chemical stability. The conventional sintering process for ceramics, typically performed at high temperatures (~1000 °C), poses a critical bottleneck for integrating solid electrolytes with active electrode materials. In this study, Li 0.29 La 0.57 TiO 3 /polypropylene carbonate (PPC) composite electrolytes containing lithium perchlorate (LiClO 4 ) were densified using cold sintering at 125 °C. The resulting LLTO‐based composite electrolytes exhibit relative densities above 80 % and ionic conductivities exceeding 10 −4 S cm −1 at room temperature. The symmetric Li/LLTO‐PPC‐LiClO 4 /Li cell with PVDF interlayers achieves a high critical current density of 1.8 mA cm −2 at room temperature. Solid‐state lithium batteries fabricated with LLTO composite solid electrolytes deliver a high discharge capacity of 151 mAh g −1 at 0.1 C and 135 mAh g −1 at 0.2 C. Our approach, which integrates ceramic and polymer materials, produces composite electrolytes with superior properties, highlighting the potential of cold sintering for advancing solid‐state batteries.

Source: Batteries & Supercaps

DOI: 10.1002/batt.202400631

Authors: Aras Karapekmez, Yi‐Chen Lan, Gulin Vardar, Nuri Ersoy, Enrique D. Gomez

Institutions: Pennsylvania State University, Boğaziçi University

Language: English

Topic: Advanced Battery Materials and Technologies

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,840