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A series of manganese spinels LiMn2-yMeyO4 (Me = Li, Al, Mg) were prepared and examined by XRD and electrochemical methods. The spinels doped with Li or high content of Al can exhibit discharge capacity in the 5 V region, but spinels doped with Mg do not exhibit any 5 V discharge capacity. It is also observed that the 5 V discharge capacity of Li/Al doped spinels will be greatly suppressed once calcinated at temperatures above 900 ℃ in preparation. It is suggested that the 5 V discharge capacity of Li/Al doped spinels may be originated from the special chemical/structural characteristics of spinel phases containing Li or high content of Al prepared at temperatures below 900 ℃.
A series of manganese spinels LiMn2-yMeyO4 (Me = Li, Al, Mg) were prepared and examined by XRD and electrochemical methods. The spinels doped with Li or high content of Al can exhibit discharge capacity in the 5 V region, but spinels doped with Mg do not exhibit any 5 V discharge capacity. It is also seen that the 5 V discharge capacity of Li / Al doped spinels will greatly greatly reduced once calcinated at temperatures above 900 ℃ in preparation. It is suggested that the 5 V discharge capacity of Li / Al doped spinels may be originated from the special chemical / structural characteristics of spinel phases containing Li or high content of Al prepared at temperatures below 900 ° C.