Journal of Applied Reliability (한국신뢰성학회지:신뢰성응용연구)

The Korean Reliability Society (한국신뢰성학회)
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Evaluation and monitoring of degradation mechanism of Li-ion battery for portable electronic device

휴대전자기기용 저용량 리튬이온 배터리의 충방전 열화 기구 분석 및 모니터링

  • Byeon, Jai Won (Department of materials science & engineering, Seoul national university of science & technology)
  • 변재원 (서울과학기술대학교 신소재공학과)
  • Received : 2013.05.15
  • Accepted : 2013.06.08
  • Published : 2013.06.25
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Abstract

As a fundamental experimental study for reliability improvement of lithium ion secondary battery, degradation mechanism was investigated by microscopic observation and acoustic emission monitoring. Microstructural observation of the decomposed battery after cycle test revealed mechanical and chemical damages such as interface delamination, microcrack of the electrodes, and solid electrolyte interphase (SEI). Acoustic emission (AE) signal was detected during charge and discharge of lithium ion battery to investigate relationships among cumulative count, discharge capacity, and microdamages. With increasing number of cycle, discharge capacity was decreased and AE cumulative count was observed to increase. Observed damages were attributed to sources of the detected AE signals.

Keywords

References

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