成果報告書詳細
管理番号20140000000837
タイトル*平成23年度中間年報 「新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業(燃料電池・蓄電池) EV用リチウム系二次電池特性の多重“In-Situ”評価法の確立および応用」
公開日2015/4/24
報告書年度2011 - 2011
委託先名電動車両技術開発株式会社 国立大学法人東京農工大学
プロジェクト番号P10020
部署名イノベーション推進部
和文要約
英文要約Title: New Energy Venture Business Technology Innovation Program/ New Energy Venture Business Technology Innovation Program (Fuel Cells and Batteries)/ Establishment Regarding ”In-situ” and Simultaneous Multiplicity-Diagnosing Characterization Method of Many Lithium Ion Batteries for Electric Vehicle and Its Application (FY2011-FY2012) FY2011 Annual Report

Objective of the present research is focused on making a new evaluation method of SOC (State of Charge), SOH (State of Health) and SOL (State of Life) of lithium ion secondary battery (LIB) by using a FFT (first Fourier transform) method with multi-channels and on applying its method to diagnose many cells for electric vehicle in a short time. For certify the advantage of this method, the following research themes were conducted.
1. Basic experiments to examine the main factors to produce the performance of charge-discharge curves of LIB
a) Preparation of evaluating cells; 18650-Type battery packs and modules including thermal and mechanical design were prepared. The capabilities of the pack and the sub-module were 100V and 40A, and 25V and 40A, respectively. Peltier device was used as a temperature-controller around the LIBs to keep the cell- temperature a constant. FFT experiment is performed with the prepared battery packs and modules.
b) Evaluating test at laboratory-level; Instrumentation and software for a newly prepared FFT method was developed for our measurements and analysis of the data. The resulting data were represented with 3D expression. AC Impedance spectrum (ACIS) measurements were conducted with frequency from 65 kHz to 0.01 Hz by using FRA and with a newly prepared FFT method with 13-channels. LIBs used for the ACIS measurement were 18650-type ones for EV. Simultaneous measurement of the 12 sets of ACIS using FFT with multi-channels was performed. Accumulation of the ACIS data is being performed.
c) Characterization of the materials composed of LIB for EV and examination of their electrochemical behavior; 18650-LIB used for the ACIS measurement was found to be composed of a cathode with Li salt of Ni, Mn and Co oxide, an anode with graphite, and 1.0M LiPF6 electrolyte with EC/PC/DMC. The correlation between the battery performances and electrode materials is being examined. Furthermore, we analyzed quantitatively the CV under the solid-state of Li4Ti5O12 (LTO) particles with various sizes and the specific surface area and with the additive of carbon powder confined on electrodes, which has been known as an anodic material. The corresponding analytical method is going to apply for the characterization of materials used for the 18650-LIB.
2. Evaluation and Diagnosis of LIB with FFT method and its superiority
In FRA and FFT experiments, a sinusoidal perturbation signal with the current amplitude from 0.10 to 1.0 mAcm-2 was superimposed onto the described dc potential, in which the oxidation state of the cell is altered. Under the same circumstances for SOC and temperature, we notice that no deviations between the curve obtained by FRA and the curve obtained by FFT can be seen at all of frequencies; from 0.010 to 10 kHz, that is, no differences in two spectra can be detected. In the case of FFT experiments with 12 channels, the data of 12 spectra were obtained in about 8 minutes. However, in the case of FRA, the data of 1 spectrum were obtained over 1 hour. Time required for the ACIS measurement per one sample reduced one hundred in time by the FFT. Furthermore, in order to establish the accuracy of FFT method, we developed the related soft-ware and a measurement procedure. Here, the dynamic range of the analyzed frequency apparently expanded 105 to 108, which corresponds to the range of 10-3 to 105 Hz.
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