E3S Web Conf.
Volume 16, 201711th European Space Power Conference
|Number of page(s)||5|
|Section||Energy Storage Posters|
|Published online||23 May 2017|
Toward State Estimation of Satellite-Borne Lithium-Ion Battery Based on Low Frequency Impedance Data
1 SOKENDAI, School of Physical Sciences, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, 252-5210, Japan
2 Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, 252-5210, Japan
3 Tokyo University of Science, Faculty of Science and Technology, 2641 Yamazaki, Noda city, Chiba, 278-8510, Japan
The satellite borne batteries should be composed by safe materials if we don’t want to have a risk of explosion caused by batteries. Therefore, we focused on two safe batteries. One is a lithium-ion battery with an ionic liquid electrolyte, and the other is a LiFePO4/C type lithium-ion battery. To check whether the batteries are suit for space applications or not, we demonstrate the ionic liquid type batteries and LiFePO4/C type battery in orbit by mounting on “Hodoyoshi-3” microsatellite, and test LiFePO4/C type cell on the ground at various conditions for a better understanding.
On the ground tests, AC impedance and capacity of the cells were initially measured, and charge/discharge cycling was constantly repeated at 10, 23 and 45°C. The cells were discharged by constant current (CC) protocol to DOD 50% with 1.0 C for 30 minutes. They were then charged by a constant-current/constant voltage (CC-CV) protocol to 3.6 V for 65 minutes with 0.5 C. For capacity check, the cells were charged at 1.0 C in CC-CV mode until their charge current becomes 60 mA, and discharged at 1.0 C in CC mode to 2.0 V at 23°C. The AC impedance was measured by applying 100 mA of AC oscillation over the frequency range from 0.01 Hz to 10 kHz at SOC 50%.
As a result, the decrease in the impedance for the charge transfer through the cycles was observed at each test condition. Furthermore, especially in over recommended charge condition at 10°C, cells that were charged and discharged at 1.1 A/1.1 A were led to internal short circuit. The results suggested that the negative electrode performed as a “lithium-ion excess” by cycles. We define “lithium-ion excess” that lithium-ion happens to stay inside the negative electrode without desorption after cells discharge.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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