Lithium-rich manganese oxide (Li2MnO3) is prepared by reverse microemulsion method employing Pluronic acid (P123) as a soft template and studied as a positive electrode material. The as-prepared sample possesses good crystalline structure with a broadly distributed mesoporosity but low surface area. As expected, cyclic voltammetry and charge-discharge data indicate poor electrochemical activity. However, the sample gains surface area with narrowly distributed mesoporosity and also electrochemical activity after treating in 4 M H2SO4. A discharge capacity of about 160 mAh g-1 is obtained. When the acid-treated sample is heated at 300 °C, the resulting porous sample with a large surface area and dual porosity provides a discharge capacity of 240 mAh g-1. The rate capability study suggests that the sample provides about 150 mAh g-1 at a specific discharge current of 1.25 A g-1. Although the cycling stability is poor, the high rate capability is attributed to porous nature of the material.
|Number of pages||12|
|Journal||Journal of Solid State Electrochemistry|
|State||Published - Dec 2013|
Bibliographical noteFunding Information:
The authors thank Renault Nissan Technology and Business Centre India Pvt. Ltd. for financial support, and Dr. Subramani and Dr. Arockia Vimal for helpful discussions. The authors also thank Dr. C. Shivakumara for his help in analysis of XRD patterns.
- High rate capability
- Lithium-ion cell
- Lithiumexcess manganese oxide
- Microemulsion route
- Polymer template