於丁二?電解質添加碳酸乙烯酯對鋰離子電池性能之影響;The effects of addition of ethylene carbonate in succinonitrile-based electrolyte on the performance of Li-ion batteries

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题名:	於丁二?電解質添加碳酸乙烯酯對鋰離子電池性能之影響;The effects of addition of ethylene carbonate in succinonitrile-based electrolyte on the performance of Li-ion batteries
作者:	陳柏宇;Chen, Bo-Yu
贡献者:	材料科學與工程研究所
关键词:	丁二?;電解質;碳酸乙烯酯;鋰離子電池;succinonitrile;electrolyte;ethylene carbonate;Li-ion batteries
日期:	2021-08-10
上传时间:	2021-12-07 11:54:42 (UTC+8)
出版者:	國立中央大學
摘要:	本研究將不同體積百分比(10, 20, 30 %(v/v) )之碳酸乙烯酯添加至含有六氟磷酸鋰之丁二?溶液以配置成0.3 M六氟磷酸鋰溶液，並從化學穩定性、電化學阻抗圖譜、充放電及界面穩定性測試去分析添加碳酸乙烯酯對丁二?電解質之影響。從化學穩定性可得知添加碳酸乙烯酯有助於抑制丁二?與鋰金屬反應。從電化學阻抗圖譜可得知當添加30 %(v/v)之碳酸乙烯酯，其電解質於室溫下具有2.3810-3 S cm-1之離子傳導率。從充放電測試可得知磷酸鋰鐵/添加30 %(v/v)碳酸乙烯酯之電解質/鋰金屬半電池於0.1 C具有約143 mAh g-1之放電電容值，此電容值為理論電容值(170 mAh g-1)之84 %。於界面穩定性測試，當以0.1 mA/cm2電流密度進行充放電時，添加30 %(v/v)碳酸乙烯酯之電解質其電池能於穩定之電壓範圍進行充放電，因此推論於此添加量，碳酸乙烯酯能與鋰金屬反應生成較穩定之固態電解質界面。;In this research, different volume percentage (10, 20, 30 %(v/v) ) of ethylene carbonate is added into succinonitrile mixed with lithium hexafluorophosphate to form 0.3 M lithium hexafluorophosphate solution. By using chemical stability test, electrochemical impedance spectroscopy, charge and discharge test, and interface stability test, we can analyze the effect of the addition of ethylene carbonate in succinonitrile-based electrolyte on the Li-ion batteries. The chemical stability tests show that the addition of ethylene carbonate can inhibit the interfacial reaction of lithium metal and succinonitrile. Based on the results of electrochemical impedance spectroscopy, the electrolyte possesses the ion conductivity of 2.3810-3 S cm-1 at room temperature when 30 %(v/v) amount of ethylene carbonate is added. The charge and discharge tests also indicate that lithium iron phosphate/30 %(v/v) ethylene carbonate in succinonitrile-based electrolyte/lithium metal half cell shows the discharge capacity of 143 mAh g-1, which is 84 % of the theoretical capacity (170 mAh g-1). Interface stability test indicates that when 30 %(v/v) amount of ethylene carbonate is added, the battery can charge and discharge at the stable voltage range, it can be concluded that the stable solid electrolyte interface forms between electrolyte and lithium metal.
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