Majid Farahmandjou . You can use multi valence doped ion (V+5), (W+6), which has small ionic radius, facilitate Li diffusion , and slowing O-2 movement

Thanks Khaled.

But some metal doping may change the crystal structure which cause voltage fading in cathode. What is the best doping ratio to keep the crystal stability?

On the other hand, doping atoms should enhance the binding energy of the transition metal (Mn, Ni and Co) and decrease the cation mixing and then increase the capacity retention.

Apart from doping, is there any way to suppress the oxygen movement in Li- rich cathode materials?

Dear Majid, thank you for posting this very interesting technical question. As a synthetic chemist working in the field of organolanthanide chemistry I'm certainly not a proven expert enough to give you a qualified answer. However, I just came across some potentially useful references which might help you in your analysis. Please have a look at the following articles entitled:

Suppressing Surface Lattice Oxygen Release of Li-Rich Cathode Materials via Heterostructured Spinel Li 4 Mn 5 O 12 Coating

Article Suppressing Surface Lattice Oxygen Release of Li-Rich Cathod...

and

Surface reinforcement doping to suppress oxygen release of Li-rich layered oxides

Article Surface reinforcement doping to suppress oxygen release of L...

Unfortunately these articles have not yet been posted by the authors as public full texts on RG. However, there is always the possibility to request a full text directly from the authors. Also please check if they are perhaps available through your institution. I hope this helps.

Good luck with your research and best wishes!

Thank you Professor Edelmann for your valuable assistance.

I have read several ublished papers about improving capacity of the Li rich cathode materials especially MNC systems. Most of them refer to metal doping and surface coating modification by anionic and cationic elements to suppress oxygen release and crystal stability.

I am searching a practical way to suppress the oxygen gas generated from the initial charging above 4.5 V. I am looking for a chemical reaction to enhance the metal oxygen (M-O) bond strenth to improve the electrochemical properties of the Li rich cathode oxide.

Despise from cathode application, is there any practical way to increase the M-O bond?

regards

Hi,

I am a fresh researcher but I think this link will be useful https://m.youtube.com/watch?v=_Rkm1Ts3fPk

Thank you Akaawase to send me the useful link.