Oxygen, hydrogen, ethylene and CO2 development in lithium-ion batteries
Oxygen, hydrogen, ethylene and CO2 development in lithium-ion batteries
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DOI：
10.1016/j.jpowsour.2007.06.182
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发表时间：
2007-12
影响因子：
9.2
通讯作者：
M. Holzapfel;A. Würsig;W. Scheifele;J. Vetter;P. Novák
中科院分区：
文献类型：
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作者：
M. Holzapfel;A. Würsig;W. Scheifele;J. Vetter;P. Novák
通过原位差示电化学质谱法（DEMS）检查了不同类型的电池相关电极材料的气体析出。除了标准石墨之外，还检查了新型硅基负极，并且表明与石墨相比，在该材料上氢气和乙烯的释放显著减少。结果表明，除了电解液的氧化外，Li2O2电极的氧化反应也会产生析氧。Li[Ni0.2Li0.2Mn0.6] O2氧化后的4.5V平台同样被证明与析氧有关。在这种情况下，电解质氧化也被证明是一种副反应。对层状正极材料Li（Ni，Co，Al）O_2和Li（Ni，Mn，Co）O_2也进行了研究。研究了不同参数对锂离子电池中CO2析出的影响。CO2的生成量随着温度的升高和电池电压的升高而增加，而碳酸亚乙烯酯（VC）的加入则减少了CO2的生成量。Li（Ni，Mn，Co）O2比Li（Ni，Co，Al）O2显示出更少的CO2生成量。
Gas evolution has been examined for different types of battery-related electrode materials via in situ differential electrochemical mass spectrometry (DEMS). Besides standard graphite also a novel silicon-based negative electrode was examined and it was shown that the evolution of hydrogen and ethylene is considerably reduced on this material compared to graphite. Oxygen evolution was proven to happen on the oxidative reaction of a Li2O2electrode, besides a certain oxidation of the electrolyte. The 4.5V plateau upon the oxidation of Li[Ni0.2Li0.2Mn0.6]O2was likewise proven to be linked to oxygen evolution. Also in this case electrolyte oxidation was shown to be a side reaction. Layered positive electrode materials Li(Ni,Co,Al)O2and Li(Ni,Mn,Co)O2were also examined. The influence of different parameters on the CO2evolution in lithium-ion batteries was shown up. The amount of CO2formation is increased by high temperatures and cell voltages, while the addition of vinylene carbonate (VC) decreases it. Li(Ni,Mn,Co)O2shows much less CO2evolution than Li(Ni,Co,Al)O2.