Asla Bish

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Questions related from Asla Bish

Some half cells show negative Open circuit voltage (OCV)?

Sometimes before charge/discharge Li ion half cells do measure negative OCV open circuit voltage ( ~ -1.5 V). It's very rare but did came across some of the cells. Could you please share your...

04 November 2019 6,474 1 View

Transition metals in layered oxide compounds has a co-ordination number of 6 with neighboring oxygen atoms?

In transition metal oxide compounds (Eg.NaNi0.5Mn0.5O2, layered structure), each transition metal is co-ordinated with 6 oxygen atoms (octahedral coordination type ). However i have seen in many...

15 February 2018 9,745 2 View

Which is the best way to perform EIS test (Galvanostatic mode /Potentiostatic mode) of a battery ?

I want to measure the impedance of a Sodium ion coin cell battery. However i was wondering which mode to use? Which is the most common mode? I tried with potentiostatic mode but my plot below 1Hz...

27 August 2017 4,769 7 View

What are the implications of having multiple voltage plateus in the charge/discharge curve of a battery for practical applications?

Thank you for your time.

18 August 2017 7,038 7 View

During EIS test why do we provide low AC potential? Also the battery Open Circuit voltage decreases from 3V to 0.2V after EIS test?

I have noticed in many papers of Li/Na ion battery, they provide 5mV voltage for EIS test. Thank you for your time.

10 August 2017 1,211 9 View

Can you please give the reason for frequent breakdown of Quartz tube after heating to 900 deg. C?

I am heating my sample (NaNiCoMnO2) at 900 deg. C in presence of air for 12 hours to form metal oxide. After heating to 900 deg. C the quartz tube becomes whitish (See the attached picture) ....

10 June 2017 5,399 9 View

What is the significance of frequency range in Electrochemical Impedance Spectroscopy (EIS) plot?

In Li-Ion Battery papers i have seen in Nyquist plot (EIS plot) they categorize different resistance depending upon the frequency. Low frequency region is Warburg impedance, high frequency region...

22 March 2017 2,199 7 View

What might have caused my sample to erupt (Refer to attached fig.)?

I am trying to synthesize NaNi1/3Co1/3Mn1/3O2 material. I used sol-gel method maintaining pH of 10 and citric acid as chelating agent. I used sodium acetate, manganese acetate, cobalt acetate and...

12 March 2017 8,785 3 View

Kalman Filter can be only be applied for the Gaussian System?

Gaussian System in the sense that all the variables involve to define the system should be Gaussian distribution? I read so many papers using Kalman Filter for Battery modeling, SOC...

15 February 2017 5,865 0 View

What will cause the Hysteresis loss in Li-Ion Battery?Is there a way to reduce it?

We always observe a gap between the charging and discharging curve for different Li-ion battery cathode materials. I read in literature that polarization and overpotential is the main reason for...

12 February 2017 5,925 4 View

Can we express the representation of two mentioned compounds as equivalent notation?

Please see the attached picture for the equation. Value of x ranges from 0 to 1. Reason for equivalency?

02 November 2015 4,214 5 View

Why can't we use same current collector for anode and cathode (copper) in lithium ion batteries?

Apart from conductivity of current collectors, what is the other property that can have impact on Battery performance and how? Thanks in advance

15 October 2015 5,834 18 View

Testing method to prove battery 1C capability?

Is there any specific test method to prove that battery has 1C capability (Charge C rate @1C, Discharge C-rate @1C, Cycle life @1C)? Any testing method that would confirm the battery technology...

01 January 1970 8,697 3 View