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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Elimination of Fluorination: The Influence of Fluorine-Free Electrolytes on the Performance of LiNi1/3Mn1/3Co1/3O2/Silicon-Graphite Li-Ion Battery Cells
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Elimination of Fluorination: The Influence of Fluorine-Free Electrolytes on the Performance of LiNi1/3Mn1/3Co1/3O2/Silicon-Graphite Li-Ion Battery Cells

机译：消除氟化：无氟电解质对LINI1 / 3MN1 / 3CO1 / 3O2 /硅 - 石墨锂离子电池电池性能的影响

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摘要

In the quest for environmentally friendly and safe batteries, moving from fluorinated electrolytes that are toxic and release corrosive compounds, such as HF, is a necessary step. Here, the effects of electrolyte fluorination are investigated for full cells combining silicon- graphite composite electrodes with Li-Ni1/3Mn1/3Co1/3O2 (NMC111) cathodes, a viable cell chemistry for a range of potential battery applications, by means of electrochemical testing and postmortem surface analysis. A fluorine-free electrolyte based on lithium bis(oxalato) borate (LiBOB) and vinylene carbonate (VC) is able to provide higher discharge capacity (147 mAh g(NMC)(-1)) and longer cycle life at C/10 (84.4% capacity retention after 200 cycles) than a cell with a highly fluorinated electrolyte containing LiPF6, fluoroethylene carbonate (FEC) and VC. The cell with the fluorine-free electrolyte is able to form a stable solid electrolyte interphase (SEI) layer, has low overpotential, and shows a slow increase in cell resistance that leads to improved electrochemical performance. Although the power capability is limiting the performance of the fluorine-free electrolyte due to higher interfacial resistance, it is still able to provide long cycle life at C/2 and outperforms the highly fluorinated electrolyte at 40 degrees C. X-ray photoelectron spectroscopy (XPS) results showed a F-rich SEI with the highly fluorinated electrolyte, while the fluorine-free electrolyte formed an O-rich SEI. Although their composition is different, the electrochemical results show that both the highly fluorinated and fluorine-free electrolytes are able to stabilize the silicon-based anode and support stable cycling in full cells. While these results demonstrate the possibility to use a nonfluorinated electrolyte in high-energy-density full cells, they also address new challenges toward environmentally friendly and nontoxic electrolytes.
机译：在寻求环保和安全的电池中，从含有毒性和释放腐蚀性化合物（例如HF）的氟化电解质的移动是必要的步骤。这里，通过电化学测试，研究了将电解质氟化与Li-Ni1 / 3Mn1 / 3Co1 / 3O2（NMC111）阴极组合的全细胞的影响和后期表面分析。基于BIS锂（Oxalato）硼酸锂（LiboB）和碳酸亚乙烯酯（Vc）的无氟电解质能够提供更高的放电容量（147mAhg（NMC）（ - 1））和C / 10的循环寿命更长（在200次循环后的84.4％容量保留）比具有高氟化电解质的含有LiPF6，氟碳酯（FEC）和VC的电池。具有氟电解质的细胞能够形成稳定的固体电解质相互关节（SEI）层，具有低的过电位，并且显示细胞抗性的缓慢增加，导致改善电化学性能。尽管功率能力由于较高的界面抗性而限制了无氟电解质的性能，但它仍然能够在C / 2处提供长循环寿命，并且优于40℃的高氟化电解质。X射线光电子谱（ XPS）结果表明，具有高氟化电解质的F质SEI，而无氟电解质形成富含O的SEI。虽然它们的组成是不同的，但电化学结果表明，高氟化和无氟电解质均能够稳定硅基阳极并在全细胞中支撑稳定的循环。虽然这些结果表明了在高能密度的全细胞中使用非血量电解质的可能性，但它们也为环境友好和无毒电解质提供了新的挑战。

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