In-situ XRD Battery Cell Rigaku manual

 Having read  papers on “Electrode Materials for Lithium Ion Batteries “ I cannot help but wonder why people have not considered The Intercalation Compound  Graphite Ferric Chloride as a suitable Cathode material.  I have a  back round in Graphite Intercalation Compounds and would appreciate understanding  why this material is not considered as a suitable Cathode material. This idea is not discussed in The Handbook of Batteries  by Linden and Reddy or in the book “Carbon” by Kim Kinoshita as possible Cathode material. Also, Internet searches yields no discussion of this question or investigative work.  I would very much appreciate any comments on this question. I am considering recommending that work be started to investigate this material as a suitable cathode material. I would appreciate any and all positive or negative comments on this question. 

F.J. Salzano

I am using LiCoO2 as cathode and Graphite as anode and Solid polymer electrolyte as electrolyte. I am facing problems in charging and discharging. I think parameters are not perfect. OCV is upto 2 V. 

How do you interpret a three-loop EIS for a graphite anode composite in Li-ion battery (after SEI layer formation)?

Hi,

I so badly need the active surface area of graphite felt (KFD 2.5 EA), produced by SGL Carbon group. This material is mostly used in energy applications (flow batteries etc.). If anyone has determined its surface area (by BET or any other method), I would be very grateful to know what this area is. Any papers that used this material and stated the area will also be appreciated.

Thank you.

Details:

Cell size: 18650

Capacity: 3Ah

Nominal discharge voltage: 3.9V

Material: LI (Ni_1/3 Mn_1/3 Co_1/3) O₂

80 wt% active material

Material: Graphite

Composition: 90 wt% active material

The theoretical gravimetric capacity of the cathode is 278mAh/g and the theoretical capacity of the anode is 372mAh/g.

How do I calculate the mass required to balance the cell?

In an Mg ion battery system (via CR2016 coin cells), transition metal oxide (TMO) as cathode, pure Mg metal as anode, glass fibre as separator and APC solution (2PhMgCl/THF + AlCl3) as electrolyte. Several current collectors were used here, including Graphite foil (Gif), Copper foil (Cuf), Nickel foil (Nif) and Stain steel foil (SSf). The potential range is 0.2V-2.1V. The measured capacity was shown in the following picture. Compared with TMO-Gif, the much lower specific capacity with metal current collectors maybe due to the severe corrosion. In a chloride-rich environment of APC electrolyte, the severe corrosion behavior on the surface of these metals due to the reactions with chloride anions. Gif does not have this kind of corrosion problem, so the TMO-Gif shows much higher capacity and good stability. However, if there is corrosion problem with SSf, it must be existed in the coin cell which is also made of stain steel. I have no idea why I did not find the obvious corrosion problem in coin cell when I disassemble it? The good stability and high capacity are the strong support that the Mg-battery with coin cell is very stable.  How to explain the bad performance with SSf current collector but good performance with Gif current collector in a coin cell?

a part of fundamentals.of.electrochemistry book :

When alternating current is used for the measurements, a transient state arises at the

electrode during each half-period, and the state attained in any half-period changes

to the opposite state during the next half-period. These changes are repeated according

to the ac frequency, and the system will be quasisteady on the whole (i.e., its

average state is time invariant).

For measurements, an ac component IIm sin ωt with the amplitude Im and angular

frequency ω (ω2πf, where f is the ac frequency) is passed through the electrode

(alone or in addition to a direct current). Alternating potential (polarization) changesΔE having the same frequency and an amplitude ΔEm are the response. Sometimes

alternating potential components are applied, and the resulting alternating current component

is measured. In all cases the potential changes are small in amplitude (10 mV).

For an electrode behaving like a pure (ohmic) resistance R, the relation between

the instantaneous values of current and the changes in potential at all times would be

ΔE/IΔEm /ImR. This is actually not found in real electrodes, but instead, a

phase shift α analoguous to that observed in electric circuits containing reactive elements

appears between alternating current and alternating polarization. In electrochemical

systems the potential changes always lag the current changes: ΔEΔEm

sin(ωtα), which corresponds to an electric circuit with capacitive elements. Thus,

the ac behavior of an electrode cannot be described in terms of a simple polarization

resistance R (even if variable) but only in terms of an impedance Z characterized by

two parameters: the modulus of impedance ZΔEm/Im and the phase shift α. The

reciprocal of impedance, Y1/Z, is known as admittance or ac conductance.

A model for the ac response of real electrodes is the simple electric equivalent circuit

consisting of a resistance Rs and capacitance Cs connected in series (Fig. 12.12a).

It follows from the rules for ac circuits that for this combination

Dear Members,

Most of commercial Li-ion batteries use graphite as the anode material in their batteries. I am looking for the information on material structure and properties of these electrodes. However, I find that the specific details about materials are rarely available. Could you please share the articles/papers you have come across which gives the details about commercial graphite based anode materials? (Eg. Tesla Li-ion battery)