Preparation of lithium indium oxide via a rheological phase route and its electrochemical characteristics in LiOH and Li2SO4solutions
✍ Scribed by Zhang, Guo-Qing ;Zhang, Sheng-Tao ;Wu, Xing-Fa
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 385 KB
- Volume
- 207
- Category
- Article
- ISSN
- 0031-8965
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✦ Synopsis
Abstract
Submicrometer‐sized lithium indium oxide (LiInO~2~) powder via a rheological phase method using trilithium citrate tetra hydrate (C~6~H~5~Li~3~O~7~ · 4H~2~O) and indium oxide (In~2~O~3~) has been prepared in this work for the first time. The optimal pyrolyzing temperature range to prepare crystalline LiInO~2~ is between 650 and 900 °C, which was confirmed by thermal gravimetric and differential thermogravimetric analysis of the precursor and X‐ray diffraction analysis. The pure phase LiInO~2~ sample obtained has a uniform particle morphology and submicrosize, which was observed by scanning electron microscopy. The electrochemical studies show that a new pair of cathodic and anodic peaks at 0.23 and 0.38 V (vs. saturated calomel electrode) was obviously observed from the cyclic voltammetry curve of LiInO~2~ in 1 M LiOH solution, indicating a battery characteristic of the material in this electrolyte. While in 1 M Li~2~SO~4~ solution, the sample presents a supercapacitive characteristic within the same potential range. The reasons for different electrochemical behaviors in these two electrolytes can be attributed to the fact that the reaction of lithium ion insertion/extraction into/out of a LiInO~2~ electrode takes place in the bulk material in LiOH electrolyte solution, whereas it takes place on the electrode/electrolyte interface for Li~2~SO~4~ electrolyte case.