HANNOVER MESSE 2020, 20 - 24 April
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Aqueous processing of cathode material

Process for the production of cathodes for lithium-ion batteries.

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Karlsruher Institut für Technologie

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Exhibitor details
Logo Aqueous processing of cathode material

Product description

Due to their high energy density, lithium-ion batteries are among the most widely used storage media when it comes to portable electronic devices, e-mobiles or stationary energy storage devices. The increasing economic importance goes hand in hand with a steadily rising production demand, which increasingly focuses on the sustainable production of batteries and electrodes. One approach in electrode manufacturing is to renounce expensive, toxic organic solvents such as N-methylpyrrolidone (NMP) by using water as dispersion medium instead. This environmentally friendly method already works for anodes, but experiments in cathode production have so far failed due to the associated deterioration in battery performance. The reason is that the lithium contained is dissolved out of the cathode and the pH value rises drastically, which ultimately leads to corrosion of the current collector. Scientists from the Helmholtz Institute Ulm (HIU) at KIT have developed a new method for the aqueous processing of cathode material for lithium-ion batteries. The method overcomes the previous disadvantages by synergistically combining two processing additives and without the need for any additional processing steps. On the one hand, phosphoric acid is added to the electrode paste to buffer the pH value and stabilize the active material surface. On the other hand, citric acid is added in order to crosslink the water-soluble binder in situ. The binder thus crosslinked improves the mechanical properties of the electrode and leads to substantially enhanced cycle stability, while the modified active material surface leads to a significant improvement in capacity and rate performance.

You can get an overview of this technology at KIT stand. Detailed information can be exchanged individually in contact with the responsible scientific employees of KIT after the industry fair.

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