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Mechanism of Gas Generation in Lithium Ion Batteries by Overdischarge

机译：锂离子电池过放电产生气体的机理

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We found that over-discharging (ODC) LiMn_2O_4-based lithium ion batteries (LIBs) generates H_2 gas. To investigate the origin of the H_2 gas, we performed isotope-labeling of the electrolyte in addition to physical and chemical analyses. ODC proved to destroy SEI films on the anode surface. Also, the volume of the ODC-induced gas increased with charge/discharge cycles, which we attribute to a thicker SEI with H atoms after the cycles. Our isotope-labeling experiment shows that the H_2 is not derived from the electrolytes; rather, H-impurities in the cathode active material seem to be the H_2 source.

机译：我们发现，过放电（ODC）的LiMn_2O_4基锂离子电池（LIB）会产生H_2气体。为了研究H_2气体的来源，除了进行物理和化学分析外，我们还对电解质进行了同位素标记。事实证明，ODC会破坏阳极表面的SEI膜。另外，ODC诱导气体的体积随充电/放电循环而增加，这归因于循环后具有H原子的SEI较厚。我们的同位素标记实验表明，H_2并非源自电解质。相反，阴极活性材料中的氢杂质似乎是氢的来源。

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来源
《Battery safety》|2015年|17-22|共6页
会议地点 Phoenix AZ(US)
作者
M. Hashimoto; M. Yamashiro; T. Ichihashi; A. Toda; T. Miyazaki; S. Fujieda;
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作者单位

Smart Energy Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan;

Smart Energy Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan;

Smart Energy Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan,Department of Science and Engineering, Tokyo University of Science, 2461 Yamazaki, Noda, Chiba 278-0022, Japan;

Smart Energy Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan;

Smart Energy Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan;

Smart Energy Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan;

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Mechanism of Gas Generation in Lithium Ion Batteries by Overdischarge

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