期刊
MATERIALS TRANSACTIONS
卷 56, 期 2, 页码 269-273出版社
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.M2014396
关键词
acoustic emission; lithium-ion battery; in-situ evaluation; degradation; micro-crack
资金
- National Research Foundation of Korea (NRF) - Korean Government (MEST) [NRF-2012R1A1A1012603]
- Korea Institute of Science and Technology (KIST)
Acoustic Emission (AE) technique was employed for evaluating charge/discharge damage in a lithium-ion battery. A coin-type battery of lithium cobalt oxide/carbon electrodes was used for acoustic monitoring during accelerated charge/discharge cycle test. A number of AE signals were successfully detected during charge/discharge. Microstructural observation of the electrodes after the cycle test revealed mechanical damage such as micro-cracking of the cathode and chemical damage such as solid electrolyte interphase (SET) layer formed on the anode. The detected AE signals were classified into two distinct types (i.e., type 1 and type 2) based on the AE waveform parameters (i.e., duration and amplitude). The main frequency component of the type 1 signal with short duration and high amplitude was in the range of 121-160kHz, whereas the frequency of type 2 signals with long duration and low amplitude was between 81 and 120 kHz. Active AE source of type 1 and type 2 signal was attributed to micro-cracking in cathode and gas bubble accompanied by SET layer formation, on anode, respectively. These results demonstrate the feasibility of the AE technique for the evaluation of charge/discharge degradation of secondary battery.
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