Electrochemical behaviors of LiCo1/3Ni1/3Mn1/3O2 in lithium batteries at elevated temperatures

Electrochemical behaviors of LiCo1/3Ni1/3Mn1/3O2 were examined in non-aqueous lithium cells and lithium-ion cells with Li[Li1/3Ti5/3]O-4 at 30, 55, 75, and 95 degrees C. Li/LiCo1/3Ni1/3/Mn1/3O2 cells showed rechargeable capacity of 205 mAh g(-1) at 30 degrees C, 210mAh g-1 at 55 degrees C, and 225 mAh g-1 at 75 degrees C in voltages of 2.5-4.6V. Results on rate-capability tests at 55 degrees C indicated that LiCo1/3Ni1/3Mn1/3O2 was capable to deliver 160 mAh g(-1) of capacity even at 4000 mA g(-1) while high-rate charge was very hard due to electrical shortage derived from lithium metal deposition. Lithium-ion cells of Li[Li1/3Ti5/3]O-4 and LiCo1/3Ni1/3Mn1/3O2 could operate with rechargeable capacity of 150mAh g(-1) at 1600 mA g(-1) without any electrical shortage during charge and discharge at 55 degrees C. One-hundred cycle test of the lithium-ion cell with variation of temperature 55, 75, and 95 degrees C, in voltages of 1.00-3.05 V was also examined and shown that LiCo1/3Ni1/3Mn1/3O2 was the most promising positive-electrode material for advanced lithium-ion batteries. (c) 2005 Elsevier B.V. All rights reserved.