Just out of curiosity, is there anyone current working on materials for cathodes for lithium ion batteries that exceed 5V vs Li?
LiNiPO4, for example. But problem not with cathode, with electrolyte exists.
I guess it would be better to ask a technical question here. What do you want to know about such a positive electrode material?
See, for example:
Article Electrolyte-cathode interactions in 5-V lithium-ion cells
http://jes.ecsdl.org/content/162/14/A2490.short
Article Novel 5 V Spinel Cathode Li 2 FeMn 3 O 8 for Lithium Ion Batteries
Exactly, but what is next when we have found solid electrolytes or cathode coatings that are stable and act as an interlayer, what is next?
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