Kenneth Pisarczyk - Effect of processing and physical properties on the electrochemical performance of lithium manganese oxide spinel produced from alkali permanganates.     Pillai, Chithambarathanu G

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  Publication Details (including relevant citation   information): Effect of processing and physical   properties on the electrochemical performance of lithium   manganese oxide spinel produced from alkali permanganates.   Pillai, Chithambarathanu G.; Padhi, Akshaya K.; Osborne, Mike;   Pisarczyk, Ken. Carus Chemical Company, LaSalle, IL, USA. ITE   Letters on Batteries, New Technologies & Medicine (2001),   2(3), B9-B16. Publisher: ITE-IBA Publication Office, Journal   written in English. Abstract A process for the industrial   manufacture of lithium manganese dioxide spinel starting from   Mn+7 , such as in KMnO4, is described. In this new process, Mn+7   is reduced to Mn+4 forming an alkali containing synthetic MnO2.   The alkali in MnO2 is replaced by Li in an ion exchange reaction   with a lithium compound to form a spinel precursor that is then   calcined to form Mn +3.5, the spinel LiMn2O4. The physical   properties of the MnO2 are determined. at the permanganate   reduction step by controlling process factors. These MnO2   properties are retained when the spinel is formed. By optimizing   the manufacturing. process, a spinel with higher electrochemical   capacity and lower fade is produced as compared to a spinel   formed by more traditional processes. The electrochemical data   indicate that process conditions to produce the precursor MnO2   and the spinel as well as morphology of the particles have a   greater effect on the electrochemical performance of the cathode   material than those exerted by the physical properties such as   particle size or surface area.

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