Laminated lithium-ion cells with high specific characteristics

Electrical Engineering

Electrical engineering complexes and systems


Аuthors

Rebrov S. G.1*, Yanchur S. V.2**, Faustov A. V.3***, Filin S. V.3****

1. State Scientific Center of the Russian Federation “Keldysh Research Center”, Moscow, Russia
2. Keldysh Research Centre, 8, Onezhskaya str., Moscow, 125438, Russia
3. Research Institute of Applied Acoustics, 7А, 9th of May str., Dubna, Moscow region, 141981, Russia

*e-mail: rebrov_sergey@mail.ru
**e-mail: y3862@yandex.ru
***e-mail: artefausto@yandex.ru
****e-mail: svfilin@yandex.ru

Abstract

Lithium-ion batteries are widely employed for space applications due to a number of advantages compared to other electrochemical systems, especially due to their high specific energy and volume values. Laminated lithium-ion cells possess maximum specific characteristics among lithium-ion cells of other types (cylindrical and prismatic). Besides, they allow use available space more effectively. Despite skeptical attitude towards the laminated Lithium-ion batteries, however, there is information on their successful application in space conditions.

Keldysh Research Center is developing the space oriented Lithium-ion batteries with improved operational and specific characteristics. For example, Keldysh Research Center has already developed and tested the Lithium-ion battery for application in outer space conditions. The objective of the studies being performed is creation of the laminated Lithium-ion battery with improved specific characteristics, large calendar and cyclic life and a possibility to function in conditions of outer space. The task at this stage of the research work consists in searching for cathode and anode compositions allowing achieve maximum specific and volumetric parameters, as well as study electrical characteristics of these batteries under normal climatic conditions.

The studies conducted by Keldysh Research Center with cooperation of the Research Center of Applied Acoustics aiming at searching for cathode and anode composition allowed obtain maximum specific and volumetric parameters for laminated lithium-ion cells (often also called polymer Li-ion by mistake).

Two types of Lithiated oxide of Nickel-Manganese-Cobalt (NMC) and three types of Lithiated oxide of Nickel-Cobalt-Aluminum (NCA) were used as active cathode materials. Six different types of battery-grade carbons were used as active anode materials. N-methylpyrrolidone was used as a solvent for cathode slurries manufacturing, and water was used for anode manufacturing. As the studies revealed, the brand NCA A801-COA was the best choice as an active cathode material and carbon black brand AGP-2A was the best choice as an active anode material. The mass fraction of the active cathode material in the cathode mass was improved up to 93%; the fraction of the active anode material was improved up to 95%. Specific characteristics increase while manufacturing laminated batteries of high capacity. It indicates the batteries manufacturing flexibility while transferring from small-sized laboratory cells to large-sized experimental cells.

The obtained optimal electrodes compositions for Li-ion cells with rated capacity in the range of 1.6-15.3 A·h allow achieving the specific and volumetric values at the level of 230-268 W·h/kg and 520-560 W·h/lrespectively. The following characteristics were demonstrated herewith: for charge-discharge currents of 0.2C-0.2C the cyclability was about 1200 cycles with 97.75% efficiency; for charge-discharge currents of 0.2C-0.1C it was about 980 cycles with 87.8% efficiency, and for charge-discharge currents of 0.5C-1C the cyclability was about 460 cycles with efficiency of 89.1%.

Keywords:

laminated lithium-ion cell, lithiated nickel-cobalt-aluminun oxide, high specific energy, cyclability, discharge capacity

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