Continental and Aurora finalize design of scalable Level 4 autonomous trucking system; production start in 2027
Hesai introducing high-performance AT512 long-range lidar and ultra-thin ET25 behind-the-windshield lidar

Researchers investigate sodium metasilicate as better binder for Na-ion electrodes

In a paper published in the journal ChemSusChem, a team from Helmholtz Institute Ulm, Karlsruher Institut für Technologie, Swansea University School of Engineering, and IISC Bangalore investigated inorganic sodium metasilicate (SMS) as a viable binder in conjunction with P2-Na0.67Mn0.55Ni0.25Fe0.1Ti0.1O2 (NMNFT) cathode material for sodium-ion batteries (SIBs).

Sodium metasilicate is widely used in laundry detergent, ceramics, plating, textiles, printing, papermaking, concrete, cement, fireproof materials, oils, leather processing, and many other industrial fields. (As a side note, the US government’s Car Allowance Rebate System (CARS), a “cash for clunkers” scheme which ended in 2009, used a sodium silicate to destroy the engines in the sacrificed vehicles. )

P2-type cobalt-free MnNi-based layered oxides are promising cathode materials for sodium-ion batteries (SIBs) due to their high reversible capacity and well chemical stability. However, the phase transformations during repeated (dis)charge steps lead to rapid capacity decay and deteriorated Na+ diffusion kinetics. Moreover, the electrode manufacturing based on polyvinylidene difluoride (PVDF) binder system has been reported with severely defluorination issue as well as the energy intensive and expensive process due to the use of toxic and volatile N-methyl-2-pyrrolidone (NMP) solvent. It calls for designing a sustainable, better performing, and cost-effective binder for positive electrode manufacturing.

—Xu et al.

In their study, the team found that the NMNFT-SMS electrode delivered a superior electrochemical performance compared to carboxy methylcellulose (CMC) and PVDF based electrodes with a reversible capacity of ~161 mAh/g and retaining ~83% after 200 cycles. Lower cell impedance and faster Na+ diffusion was also observed in this binder system.

With these findings, SMS binder can be proposed as a powerful multifunctional binder to enable positive electrode manufacturing of SIBs and to overall reduce battery manufacturing costs.

—Xu et al.

Resources

  • Ruochen Xu, Venkat Pamidi, Yushu Tang, Stefan Fuchs, Helge Stein, Bosubabu Dasari, Zhirong Zhao-Karger, Santosh Behara, Yang Hu, Shivam Trivedi, Anji Reddy Munnangi, Prabeer Barpanda, Maximilian Fichtner (2024) “Greener, Safer and Better Performing Aqueous Binder for Positive Electrode Manufacturing of Sodium Ion Batteries” ChemSusChem doi: 10.1002/cssc.202301154

Comments

The comments to this entry are closed.