:The layered lithium-manganese oxide (Li 2 MnO 3 ) as a cathode material of lithium ion secondary batteries was prepared and characterized the physico-chemical and electrochemical properties. The morphological and structural changes of MnO(OH) and Li 2 MnO 3 are closely connected to the changes of electrochemical properties. The crystallinity of Li 2 MnO 3 is enhanced as the annealing temperature increase, but its capacity is reduced due to the easier structural changes of less crystalline Li 2 MnO 3 than highly crystalline one. Moreover, the addition of buffer material such as MnO(OH) into cathode causes to reduce the morphological and structural changes of layered Li 2 MnO 3 and increase the discharge capacity and cycleability.

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The layered lithium-manganese oxide (Li 2 MnO 3 ) as a cathode material of lithium ion secondary batteries was prepared and characterized the physico-chemical and electrochemical properties. The morphological and structural changes of MnO(OH) and Li 2 MnO 3 are closely connected to the changes of electrochemical properties. The crystallinity of Li 2 MnO 3 is enhanced as the annealing temperature increase, but its capacity is reduced due to the easier structural changes of less crystalline Li 2 MnO 3 than highly crystalline one. Moreover, the addition of buffer material such as MnO(OH) into cathode causes to reduce the morphological and structural changes of layered Li 2 MnO 3 and increase the discharge capacity and cycleability.

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