2013 Fiscal Year Final Research Report
Safety Evaluation of Lithium Ion Secondary Batteries by using Ultramicroelectrodes and Infrared Microscopy
| Project/Area Number |
23310107
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Social systems engineering/Safety system
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| Research Institution | Yamagata University |
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Principal Investigator |
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 安全工学 / リチウム電池 / マイクロ電極 / 内部短絡 / 赤外線顕微鏡 / 過充電 / 電流遮断法 / リチウムロス |
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| Research Abstract |
Safety issue of lithium secondary batteries have been investigated. Unfortunately, the application of infrared microscopy to monitor the temperature increasement for microscopic scale would not work due to the interference by the thick electrolyte solution on the electrode. The application of microelectrode as the model for shorted circuit caused by the micro-particle of metals was also would not work due to the fused out of very thin Pt wire. According to the current interrupt technique, rate determining step of battery reaction was the ion transfer process of electrolyte solution. We also found that the carbon conductive agent include the Fe impurity. This Fe dissolve/precipitate at anode/cathode and makes shorted circuit throughout the separator.
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