2016, Volume 19, Issue 2
Influence of Temperature Variation Over Characteristic Capacity in 18650 Li-Ion Rechargeable Battery
National Research and Development Institute for Cryogenics and Isotopic Technologies - ICSI Rm. Valcea, Uzinei Street no. 4, PO Box Râureni 7, 240050, Râmnicu Vâlcea, Romania
Temperature variation it is known to have an important impact on the safety, cycle lifetime and performances of lithium-ion battery. This paper deals with an 18650 type Li-ion rechargeable battery, which was charged/discharged with a specific rate of 0.2A into a range of temperature between 2-52°C. Tested cell was fabricated in research laboratory of ROM-EST. To reach the goal has been used Fuelcon B Evaluator battery testing system equipped with a thermal chamber which allow variation of temperature into a range -30 to 80°C. Battery testing unit, is a scalable system with 8 optional enlargement channels. The charge/ discharge current can be chose between 10 mA and 100A. Tendency of specific charging capacity is to decrease when temperature grow or drops compare with room temperature, reaching a maximum value at 32°C (82 mAhg-1) and a minimum at 2°C, where charging capacity was 72 mAhg-1. Discharge capacity respect the same tendency, reaching a maximum value at 32°C mAh (80 mAhg-1) and a minimum at 2°C, where discharging capacity was 70 mAhg-1. The increasing of degradation capacity rate at elevated temperatures is due surface layer passivation by anodic oxidation of electrolyte and co-solvents decomposition. (e.i. ethylene carbonate).
Li-ion battery, specific capacity, battery test station, temperature variation.
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