Mn02 and Ramsdellite -Mn

The structure of the lithiated ramsdellite- Mn02 product after reaction with LiOH at 300 °C is shown in Fig. 3(d) [6]. The overall ideal reaction, which is similar to that when LiOH is used as a lithiating agent, can be written as  

In this case, lithiation of ramsdellite occurs by incorporation of Li20 into the Mn02 structure, which is analogous to the situation for the stabilization of a - MnOz (see Sec. 1.2.2) the reaction 

These electrodes have been evaluated in lithium-polymer cells that operate at 85 °C [35]. Although the electrochemical discharge is not yet fully understood, differential capacity plots have shown evidence of two reversible ordering transitions and a kinetically slow phase transformation. 

The best known layered structures that have been exploited in lithium-ion cells have the general formula LiM02 (M= Co, 

In the ideal layered LiM02 structure, the Li+ and the M3+ ions occupy octahedral sites in alternate layers between cubic close packed oxygen layers (Fig. 5). 

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