Production and Characterisation of Fibre-Reinforced All-Solid-State Electrodes and Separator for the Application in Structural Batteries

Batteries

Arno Kwade¹  Daniel Vogt¹  Peter Michalowski¹ 

[1] Cluster of Excellence SE²A—Sustainable and Energy-Efficient Aviation, Technische Universität Braunschweig, Hermann-Blenk-Str. 42, 38108 Braunschweig, Germany;

关键词: structural battery composite;    polymer electrolyte;    all solid state;    carbon fibre;    electrical properties;    multifunctional;   

DOI  :  10.3390/batteries8060055

来源: DOAJ

【 摘 要 】

The electrification of the air transport sector demands for an energy storage that adds as little volume and weight to the overall system as possible. Regarding this so-called structural battery, composites enable the storage of electrical energy in commonly used load bearing fibre composite structures. A structural battery composite can store electrical energy while bearing mechanical loads, thus reducing parasitic mass and volume. In this study, structural cathodes were prepared by slurry coating carbon fibres with lithium iron phosphate (LFP), polyethylene oxide (PEO), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and carbon black. For the structural anodes, the carbon fibres were utilised as active material and slurry coated with PEO and LiTFSI. These structural electrodes as well as a structural separator were characterised by electrochemical cycling. With 139 $\mathrm{mAh}{\mathrm{g}}_{\mathrm{AM}}^{-1}$, the structural cathodes demonstrated good utilisation of the active material. The carbon fibres used in the anode exhibited capacities of up to 92 $\mathrm{mAh}{\mathrm{g}}_{\mathrm{AM}}^{-1}$. High irreversible lithium losses were observed, which are attributed to the poor electrolyte wetting behaviour of the carbon fibres. A structural battery demonstrator with a lithium metal anode was realised and reached a maximum specific energy of 64 $\mathrm{Wh}{\mathrm{kg}}^{-1}$ with respect to electrode and separator weight.

【 授权许可】

Unknown