| 离子液体作为电解液添加剂用于高压锂离子电池 |
| |
| 引用本文： | 张文林,霍宇,李功伟,孙腾飞,赵勇琪,李春利.离子液体作为电解液添加剂用于高压锂离子电池[J].化工学报,2019,70(6):2334-2342. |
| |
| 作者姓名： | 张文林 霍宇 李功伟 孙腾飞 赵勇琪 李春利 |
| |
| 作者单位： | 河北工业大学化工学院，化工节能过程集成与资源利用国家地方联合工程实验室，天津 300130 |
| |
| 基金项目： | 河北省高等学校科学技术研究项目(ZD2015118) |
| |
| 摘 要： | 合成了功能化离子液体1-丁基-3-甲基咪唑双（三氟甲磺酰）亚胺盐（BMIMTFSI）作为高压锂离子电池电解液添加剂，用于抑制有机溶剂的氧化，以提高碳酸酯类电解液的耐高压性。分别采用充放电测试、电化学交流阻抗（EIS）、循环伏安法（CV）和扫描电子显微镜（SEM）等研究了LiNi0.5Mn1.5O4/Li电池的电化学行为和LiNi0.5Mn1.5O4材料表面形貌。结果表明，当在电解液中添加20% （体积分数）BMIMTFSI时，LiNi0.5Mn1.5O4/Li电池在室温、0.2C下的最高放电比容量是126.81 mA·h·g-1，5C下的放电比容量为109.36 mA·h·g-1，比在1 mol·L-1 LiPF6-EC/DMC电解液中的放电比容量提高了91.7%；且该电池在0.2C下循环50圈后的放电比容量保持率在95%左右，比用碳酸酯类电解液提高了近10%。SEM结果表明，在碳酸酯类电解液中加入BMIMTFSI后，LiNi0.5Mn1.5O4电极表面附着了一层均匀且致密的固态电解质界面（SEI）膜。
|
| 关 键 词： | 离子液体 电化学 氧化 电解液 高压 添加剂 锂离子电池 |
| 收稿时间： | 2018-10-10 |
| 修稿时间： | 2019-03-21 |
Ionic liquids as electrolyte additives for high-voltage lithium-ion batteries |
| |
| Wenlin ZHANG,Yu HUO,Gongwei LI,Tengfei SUN,Yongqi ZHAO,Chunli LI.Ionic liquids as electrolyte additives for high-voltage lithium-ion batteries[J].Journal of Chemical Industry and Engineering(China),2019,70(6):2334-2342. |
| |
| Authors: | Wenlin ZHANG Yu HUO Gongwei LI Tengfei SUN Yongqi ZHAO Chunli LI |
| |
| Affiliation: | National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China |
| |
| Abstract: | The functionalized ionic liquids 1-butyl-3-methylimidazoliumbis(trifluoromethanesulfonyl)imide (BMIMTFSI) was synthesized as a high-pressure lithium ion battery electrolyte additive for inhibiting the oxidation of organic solvents to enhance carbonic acid. The electrochemical behaviors of LiNi0.5Mn1.5O4/Li batteries and the surface morphology of LiNi0.5Mn1.5O4 electrode were studied by charge-discharge test, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and scanning electron microscopy (SEM). The results show that when 20% (vol) BMIMTFSI is added to carbonate-based electrolyte, the highest discharge capacity of LiNi0.5Mn1.5O4/Li cells is 126.81 mA·h·g-1 at 0.2C rate, and the discharge capacity is 109.36 mA·h·g-1 at high rate of 5C, which is 91.7% higher than that in 1.0 mol·L-1 LiPF6-EC/DMC electrolyte. And the discharge capacity retention rate of LiNi0.5Mn1.5O4/Li cells reaches about 95% after 50 cycles at 0.2C rate, which is nearly 10% higher than that with blank electrolytes. The results of SEM showed that a uniform and compact solid electrolyte interface (SEI) film was attached to the surface of LiNi0.5Mn1.5O4 electrode after adding BMIMTFSI to carbonate-based electrolyte. |
| |
| Keywords: | ionic liquids electrochemistry oxidation electrolytes high voltage additive lithium-ion battery |
|
| 点击此处可从《化工学报》浏览原始摘要信息 |
|
点击此处可从《化工学报》下载全文 |
