High performance screen-printed electrodes prepared by a green solvent approach for lithium-ion batteries
2016; Elsevier BV; Volume: 334; Linguagem: Inglês
10.1016/j.jpowsour.2016.10.019
ISSN1873-2755
AutoresA. Gören, João Victor Carvalho Mendes, Henrique Miguel Ribeiro Rodrigues, R. Sousa, Juliana Oliveira, Loïc Hilliou, Carlos M. Costa, M.M. Silva, S. Lanceros‐Méndez,
Tópico(s)Recycling and Waste Management Techniques
ResumoNew inks based on lithium iron phosphate and graphite for cathode and anode, respectively, were developed for printable lithium-ion batteries using the “green solvent” N,N′-dimethylpropyleneurea (DMPU) and poly(vinylidene fluoride), PVDF, as a binder. The results were compared with the ones from inks developed with the conventionally used solvent N-methyl-2-pyrrolidone, NMP. The rheological properties of the PVDF/DMPU binder solution shows a more pronounced shear thinning behavior than the PVDF/NMP solution. Cathode inks prepared with 2.25 mL and 2.50 mL of DMPU for 1 g of electrode mass show an apparent viscosity of 3 Pa s and 2 Pa s for a shear rate of 100 s−1, respectively, being therefore processable by screen-printing or doctor blade techniques. The electrodes prepared with DMPU and processed by screen-printing show a capacity of 52 mAh g−1 at 2C for the cathode and 349 mAh g−1 at C/5 for the anode, after 45 charge-discharge cycles. The electrochemical performance of both electrodes was evaluated in a full-cell and after 9 cycles, the discharge capacity value is 81 mAh g−1, showing a discharge capacity retention of 64%. The new inks presented in this work are thus suitable for the development of printed batteries and represent a step forward towards more environmental friendly processes.
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