Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7745995 | Solid State Ionics | 2014 | 4 Pages |
Abstract
Recently, layered Li1 + xV1 â xO2 with x â¥Â 0 has attracted significant attention as an anode material for Li-ion batteries. Its high volumetric and gravimetric capacities (1360 mAh·cmâ 3 and 300 mAh·gâ 1 respectively) make it particularly interesting. During lithium intercalation Li1 + xV1 â xO2 with x > 0 exhibits wide potential plateau below 0.1 V vs. Li/Li+, while for stoichiometric LiVO2 lithium uptake hardly occurs. In this work evaluation of crystal structure, transport and electrochemical properties is given for Li1 + xV1 â xO2 materials with x = 0, 0.03 and 0.07. Li1 + xV1 â xO2 showed activated character of conductivity with activation energy about 0.2-0.3 eV. Thermoelectric power values exceeding 80 μV·Kâ 1 point to electron holes as the main charge carriers. Thermogravimetric measurements carried out in air indicated only minor variations of mass of the materials up to 215 °C, suggesting high stability along with low level of oxygen nonstoichiometry.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
BartÅomiej GÄdziorowski, Åukasz Kondracki, Konrad Åwierczek, Janina Molenda,