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記
日時： 2022 年 8 月 1 日（月） 14:30 ~ 16:00
形式： 対面（事前登録をお願いします。詳細は後述）
場所： 長崎大学文教キャンパス 総合教育研究棟 2 階多目的ホール
講師： Dr. Martin Ihrig (Forschungzentrum Jülich GmbH)
演題： Ceramic-Based All Solid-State Li Batteries by Advanced Sintering Techniques
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問い合わせ先本セミナーオーガナイザー 長崎大学大学院工学研究科 山田博俊
Tel: 095-819-2861 （内線 2861）／E-mail: h-yama@nagasaki-u.ac.jp

Ceramic-Based All Solid-State Li Batteries by Advanced Sintering Techniques
Martin Ihrig*; Alexander M. Laptev; Ruijie Ye; Tarini P. Mishra; Martin Finsterbusch; andOlivier Guillon
Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis andProcessing, 52425 Jülich, Germany*E-mail of the Corresponding Author: m.ihrig@fz-juelich.deAbstract
Garnet-based Li7La3Zr2O12 (LLZ) all-solid-state Li batteries (ASBs) are considered the next generation ofLi batteries. Fabrication of such ASBs requires co-sintering of the cathode active material (CAM) andelectrolyte. However, the conventional co-sintering of CAM and LLZ leads to non-conductive side phases
as a result of long exposure to high temperatures. Advanced sintering shortens the dwell time and reduces
the sintering temperature are required to maintain phase purity.
Such a technique is Field Assisted Sintering Technique/Spark Plasma Sintering. The application of highmechanical pressure allows to lower the sintering temperature and reduce the dwell time to minutes for thefabrication of functional LiCoCO2 (LCO)/LLZ solid-state battery components e.g. dense and thick
LCO/LLZ composite cathodes providing a good utilization of LCO and leading to a high areal capacity. A
careful optimization of the sintering parameters allows the tailoring of the density and enable polymer
infiltration and so called “polymer-ceramic” ASBs
Another technique is Ultrafast High-temperature Sintering (UHS) can sinter bulk sinter-additive-free LLZ
pellets within seconds, kinetically inhibiting side reactions. Although the sintering process is short, amechanically stable, phase pure, and sufficiently dense LLZ with good ionic conductivity is obtained. The
introduced UHS process is predestined for co-sintering of LLZ and CAMs, as it could help to overcome
thermodynamic limitations and avoid the formation of a diffusion-based secondary phase, which enables
CAM/LLZ combinations which were unsuitable so far.
Besides, tape casting is suitable for the preparation of thin LLZ-based separator, a prerequisite to obtainhigh energy density. Tape casting is besides relevant for other ceramic materials such as LiFePO4 andLi1.5Al0.5Ti1.5(PO4)3 as these materials can be co-sintered. Assembly into polymer-ceramic full cells showstheir promising electrochemical performance and after some conditioning stable cycling.
Keywords: Ceramic Li batteries, FAST/SPS, UHS, tape casting, LLZO, LCO, LATP, LFP
References:
1. Ihrig et al., ACS Appl. Mater. Interfaces, 2022, 14, 9, 11288-11299
2. Ihrig et al., J. Power Sources, 2021, 482, 228905
3. Ihrig et al., ACS Appl. Energy Mater., 4, 10, 2021, 10428–10432
4. Ihrig et al.; J. Eur. Ceram. Soc., 2021, 41, 12, 6075-6079
5. Ihrig et al., J. Power Sources 2022, under review
6. Bram et al.; Adv. Eng. Mater., 2020, 22: 2000051
7. Ye et al., Green Chem. 2020, 22, 4952-4961
8. Ye et al., ChemSusChem 2021, 14 (20), 4397-4407
9. Ye et al., ACS Sustain. Chem. Eng. 2022, 10, 23, 7613–7624