Jae Won Choi

5 Questions 5 Answers 0 Followers

Questions related from Jae Won Choi

What's the difference between aqueous batteries and pseudocapacitors?

I am working on electrode materials for pseudocapacitors in aqueous electrolyte of 1M Na2SO4. However, after searching for some papers, I found the same electrolyte is used in Na-ion aqueous...

06 June 2017 8,465 0 View

What makes voltage stuck during the galvanostatic charge/discharge measurement?

I measured galvanostatic charge/discharge curve of graphene as a negative electrode for supercapacitor in 1M Na2SO4 electrolyte. Graphene was coated on the nickel foil, voltage range was -1 to 0V...

08 August 2016 8,789 4 View

How to measure specific capacitance of supercapacitors?

I made a three electrode cell of graphene + manganese oxide composite. I use Ag/AgCl and Pt wire as a reference electrode, counter electrode. When I measure CV or galvanostatic data, initial...

10 October 2015 1,255 9 View

How can I remove SEI layer?

I synthesized MnO2/graphene composite. After CV cycling, I would like to remove the SEI layer to measure SEM image. Electrolyte is LiPF6 in EC/DEC (1:1 by volume) How can I remove them? Thank you

09 September 2015 8,707 2 View

How can I prevent slurry for batteries from splitting?

I am making slurries which consist of manganese oxide and graphene. 1. Mix the material with PVDF, the ratio is 9:1 (A total of 40mg) 2. Drop the NMP by disposable pipettes. The amount of NMP...

06 June 2015 4,576 5 View