[Eneri]

These are reactions of rechargeable lithium-ion batteries, the anode being Lithium Cobalt oxide and cathode some kind of carbon (e.g. graphite) :
                                       
                                       Charge
Positive electrodes LiCoO2  Li1-x CoO2 + xLi + xe-
                                       
                                       Discharge

                                             Charge
Negative electrodes C+xLi+xe- CLix
                                           
                                           Discharge

                                              Charge
Battery as whole   LiCoO2 + C  Li1-x CoO2+CLix
                                             
                                             Discharge

If these are supposed to be redox equations, what do those 'x'es mean? Could anybody explain this in a simpler manner?

Any help or explanation will be very appreciated...
it's for a battery research

[vmelkon]

In mathematics, x, y and z (and even abcd) represents values that are not known and you are suppose figure it out or give a general description.

In chemistry, it is the same.
You might have a complex mixture of oxides.