Research Assistant; m​/f​/d focus battery research

Founded in 1607, Justus Liebig University Giessen (JLU) is a research university rich in tradition. Inspired by curiosity about the unknown, we enable around 25,000 students and 5,800 employees to advance science for society. Join us in breaking new ground and writing success stories - your own and those of our university.

Support us as early as possible in part‑time (67 %) as a

Research Assistant (m/f/d)

with a focus on battery research

The position is part of the project “Optimization and scaling of argyrodite solid‑state electrolytes for all‑solid‑state batteries (OSAKA)” funded by the BMFTR and is to be filled until 31 December 2028. It will be based at the Institute of Physical Chemistry (Prof. Dr. Jürgen Janek) at the Faculty of Biology and Chemistry. The salary is in accordance with the collective labor agreement of the State of Hessen (E 13 TV‑H).

As part of the project, the upscaling of sulfide‑based all‑solid‑state batteries (ASSB) will be investigated in collaboration with our project partners. For this purpose, analytical methods and electrochemical measurements will be used here at JLU to support the development of an optimal composition and microstructure for the cathode. In addition, degradation reactions at the interface between the solid electrolyte and cathode active material (CAM) will be investigated and the effect of CAM coatings will be evaluated.

• Production of coated and uncoated cathode composites and interlayers for lithium metal anodes
• Evaluation of interface stability using cell cycling and electrochemical impedance spectroscopy (EIS)
• Evaluation of the influence of the cathode microstructure using FIB‑SEM and other methods
• Investigation of interfaces in cathode composites and in the Si anode‑separator composite before and after cycling using XPS, ToF‑SIMS, and FIB‑SEM
• Close cooperation with colleagues within the project network
• Participating in project meetings and national and international scientific conferences
• Publishing results in scientific journals

• A scientific university degree in chemistry, physics, or materials science (MSc, diploma, or equivalent) with a grade of at least “good”
• Knowledge of materials and interface chemistry as well as surface analysis methods (especially ToF‑SIMS, XPS, FIB‑SEM)
• Practical knowledge of cell construction
• Experimental experience and skills in the preparation and characterization (surface analysis, electrochemical measurement methods) of batteries and battery materials (especially under protective gas atmosphere)
• Good IT skills, especially for data evaluation
• Proficiency in German and/or English (spelling and grammar)
• Strong communication skills and an interdisciplinary, open mindset
• Excellent written expression and scientific writing style for publication

• Interdisciplinary research in the field of analysis of energy‑relevant materials with excellent equipment in a world‑renowned research institute
• A varied job in a dynamic team with flexible working hours
• Free use of local public transport (Landes Ticket Hessen)
• More than 100 training seminars, workshops and e‑learning opportunities per year for personal development, as well as a wide range of health and sports activities
• Remuneration according to TV‑H, company pension scheme, child allowance and special payments
• Good compatibility of family and career (certificate “audit familiengerechte hochschule”)

If you have any further questions, please do not hesitate to contact Dr. Bjoern Luerssen by e‑mail (bjoern.luerssen ).

JLU welcomes qualified applications regardless of biological and social gender, disability, nationality, ethnic and social origin, religion, ideology, age as well as sexual orientation and identity. The JLU aims for a higher proportion of women in accordance with the women's promotion plan. We therefore particularly encourage qualified female candidates to apply. JLU is certified as a family‑friendly university. Applications from disabled people of equal aptitude will be given preference.

Apply via our online form by 24 March 2026
, indicating reference number 160/08. We look forward to receiving your application.