The Synthesis and Electrochemical Properties of Lithium Manganese Oxide (Li<sub>2</sub>MnO<sub>3</sub>)

Seo, Hyo-Ree; Lee, Eun-Ah; Yi, Cheol-Woo; Kim, Ke-On

doi:2011.2.3.180

J. Electrochem. Sci. Technol > Volume 2(3); 2011 > Article

Article

Journal of Electrochemical Science and Technology 2011;2(3):180-185.
DOI: https://doi.org/10.5229/JECST.2011.2.3.180

The Synthesis and Electrochemical Properties of Lithium Manganese Oxide (Li₂MnO₃)

Hyo-Ree Seo, Eun-Ah Lee, Cheol-Woo Yi, Ke-On Kim

Department of Chemistry, Korea University;Department of Chemistry, Korea University;Department of Chemistry, Sungshin Women's University;Department of Chemistry, Korea University;

Abstract

The layered lithium-manganese oxide ($Li_2MnO_3$) 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 $Li_2MnO_3$ are closely connected to the changes of electrochemical properties. The crystallinity of $Li_2MnO_3$ is enhanced as the annealing temperature increase, but its capacity is reduced due to the easier structural changes of less crystalline $Li_2MnO_3$ 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 $Li_2MnO_3$ and increase the discharge capacity and cycleability.

Key Words: $Li_2MnO_3$, manganese oxyhydroxide (MnO(OH)), hydrothermal reaction, structure changes, spinel $Li_2MnO_4$