Plasma chemical etching for c-Si photovoltaics
    Structuring of TCO layers for TF-Photovoltaics
    Infection control – Process and materials studies
    Application demonstrator for infection control
    Energy storage – Process and materials R&D
    Application demonstrator for energy storage
    Interface technologies for durable adhesion
    Application demonstrator for interface technologies
    Cross-cutting equipment development

Application demonstrator for energy storage

CVD reactor for CNT synthesis
© Fraunhofer IWS

CNT coated Ni foil
© Fraunhofer IWS

CNT coated flexible substrate
© Fraunhofer IWS

Characterization of CNT supercap
© Fraunhofer IWS

Targets

• demonstrate scalability of CNT based electrode approach to industrial level
• continuous production route for CNT-based electrodes
• performance increase of CNT based supercaps against SoA commercial solutions

Steps

• specially designed equipment for roll-to-roll processing of both the catalyst layer and the aligned CNTs (by AP-CVD)
• coin cell fabrication tool for extended performance tests

Performance tests => Coin cell configuration

• cycle stability
• energy density
• power density
• series resistance
• temperature dependence

Performance tests: Charge/discharge - cycle stability

• low internal resistance
• good cycle stability up to 45.000 cycles
• almost no side reactions

Electrochemical characterization => Impedance spectroscopy

• low capacitance decrease at much higher frequencies
• fast ion diffusion and conductivity

Unique high power density confirmed by CNT approach