Study of the lithium-ion battery at low temperatures
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Date
2020-08
Authors
Mashekova, Aiym
Nurpeissova, Arailym
Bakenov, Zhumabay
Mukanova, Aliya
Journal Title
Journal ISSN
Volume Title
Publisher
The 8th International Conference on Nanomaterials and Advanced Energy Storage Systems; Nazarbayev University; National Laboratory Astana; Institute of Batteries
Abstract
Nowadays, LIBs are one of the most demanded power sources due to their portability, high power
and energy density. The performance of LIBs depends on ambient temperature, especially, at low temperatures.
According to [1] kinetic reactions rate slows down at low working temperatures, due to physical and chemical
electrolyte properties changes, such as viscosity and conductivity etc. The main function of the electrolyte is to
transport lithium ions between the electrodes, which slows down due to a decrease in electrical conductivity at
a low operating temperature of LIBs. Furthermore, the solid electrolyte interphase (SEI) morphology,
components, and formation mechanism have significant impact on the performance of LIB. Therefore, the wide
service temperature range and required properties of the electrolyte can be achieved by changing the
combination and ratio of solvents, salts and additives.
In present work, two types of lithium-ion cells (CR2032, MTI Corp.) were assembled in Ar-filled
glovebox (LABmaster Pro, MBRAUN, <0.1 ppm H2O and O2). The first one was a reference and another one
was with electrolyte additive. 1 M LiPF6 (LPF) in ethylene carbonate (EC)/dimethyl carbonate (DMC)/ethyl
methyl carbonate (EMC) (1:1:1, by volume) was used as an electrolyte. The modified electrolyte was prepared
by adding 3 wt. % acetonitrile (AN) to the above LPF-based electrolyte. Cathode slurry was prepared by mixing
LiFePO4 (LFP), acetylene black (AB), and poly(vinyldifluoride) (PVDF) at a weight ratio of 80:15:5 in Nmethyl-
pyrrolidone (NMP) solvent, lithium metal was used as an opposite and reference electrode. The
electrochemical performance of the cells with and without AN additive was investigated at room and low (- 30
OC) temperature. All electrochemical cycling test results as well as synthesis routes and characterization details
will be presented at the conference.
Description
Keywords
Research Subject Categories::TECHNOLOGY, lithium-ion batteries, Ar-filled glovebox, low temperatures