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New Oxyhalide Solid Electrolytes with Enhanced Conductivity for All-Solid-State Batteries

Wei XueChongqing UniversityYanming CuiZhejiang Funlithium New Energy Technology Co., LtdZhixu LongChongqing UniversityHongyang ShanChongqing UniversityNur ChamidahFaculty of Engineering, Nara Women’s University, Kitauoya-nishimatchi, Nara 630-8263, JapanKentaro YamamotoFaculty of Engineering, Nara Women’s University, Kitauoya-nishimatchi, Nara 630-8263, JapanMasashi KotobukiBattery Research Center of Green EnergyHao LiInstitute of Nuclear Physics and Chemistry, Academy of Engineering PhysicsNing HuHebei University of TechnologyShufeng SongChongqing University

The Journal of Physical Chemistry Lettersjournal2025en

ABI

Annotatsiya

Departing from conventional Li–M–X6 frameworks, we develop a Li–M–X5 oxyhalide chemistry (Li3xTaO3xCl5–3x, 0.8/3 ≤ x ≤ 1.4/3) to overcome the conductivity limitation of halide-based solid electrolytes (SEs). The designed oxyhalide achieves record ionic conductivities of 9 mS cm–1 at 30 °C and 0.59 mS cm–1 at −35 °C, surpassing most reported halides. Through comprehensive characterization using X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS), we confirm that oxygen incorporation reduces Ta–O/Ta–Cl coordination numbers and induces distorted O/Cl-containing polyhedra, collectively enhancing ion migration. Full ASSBs demonstrate excellent stable cycling with 100% capacity retention after long-term 3200 cycles at a substantial 4 C rate.

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Mavzular

Advanced Battery Materials and Technologies Thermal Expansion and Ionic Conductivity Advancements in Battery Materials

Identifikatorlar

DOI: 10.1021/acs.jpclett.5c01778

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