低成本无氟水系混合溶剂醋酸锂电解液研究  

RESEARCH ON LOW-COST FLUORINE-FREE AQUEOUS MIXED SOLVENT LITHIUM ACETATE ELECTROLYTES

作　　者：吴凡 蒋文全 罗熳[1,3,4] 武媛方 张永强 赫文秀[5] Wu Fan;Jiang Wenquan;Luo Man;Wu Yuanfang-;Zhang Yongqiang;He Wenxiu(National Engineering Research Center of Nonferrous Metals Materials and Products for New Energy,GRINM Group Co.,Ltd.,Beijing 100088,China;GRIMAT Engineering Institute Co.,Ltd.,Beijing 101407,China;General Research Institute for Nonferrous Metals,Beijing 100088,China;GRINM(Guangdong)Institute for Advanced Materials and Technology,Foshan 528051,China;School of Chemistry and Chemical Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China)

机构地区：[1]有研科技集团国家有色金属新能源材料与制品工程技术研究中心,北京100088 [2]有研工程技术研究院有限公司,北京101407 [3]北京有色金属研究总院,北京100088 [4]有研(广东)新材料技术研究院,佛山528051 [5]内蒙古科技大学化学与化工学院,包头014010

出　　处：《太阳能学报》2023年第8期17-22,共6页Acta Energiae Solaris Sinica

基　　金：内蒙古自治区科技计划项目(2020GG0151);广东省高水平创新研究院项目(2021B0909050001)。

摘　　要：利用共溶剂1,5-戊二醇(PD)和聚乙二醇(PEG)改进13 m(m=[mol盐]/[kg溶剂]质量摩尔浓度)Li OAc作为水系锂离子电池电解液的电化学稳定窗口,研制低成本无氟水系混合溶剂醋酸锂电解液。通过红外吸收和拉曼散射光谱对电解液中水分子的活性进行表征,结果表明,在混合溶剂电解液中水分子的活性受到抑制。电化学测试表明电解液成分为2 m Li OAcPD0.5PEG0.5时,具有最宽的电化学稳定窗口3.10 V,使Li_(4)Ti_(5)O_(12)负极可进行可逆充放电,最后Li_(4)Ti_(5)O_(12)//Li Mn2O4全电池测试得到初始平台电压为2.3 V,能量密度为0.0616 k Wh/kg,相较于13 m Li OAc电解液具有更高的比容量和循环稳定性。Using 1,5-pentanediol(PD)and polyethylene glycol(PEG)as co-solvent to improve the electrochemical performance of 13 m(m=[mol salt][/kg solvent])LiOAc as aqueous lithium-ion batteries electrolytes obtains low-cost fluorine-free aqueous mixed solvent lithium acetate electrolytes.The activity of water molecules in the electrolyte was characterized by infrared absorption and Roman scattering spectroscopy.The results show that in the mixed solvent electrolytes the activity of water molecules is inhibited.Electrochemical tests show that the electrolytes have the widest electrochemical stability window of 3.10 V when the electrolyte composition is 2 m LiOAc-PD_(0.5)PEG_(0.5),which makes the negative electrode Li_(4)Ti_(5)O_(12)reversibly charge and discharge.Li_(4)Ti_(5)O_(12)//LiMn2O4 full cell with 2 m LiOAc-PD_(0.5)PEG_(0.5)tests show an initial platform voltage of 2.3 V and specific energy of 0.0616 kWh/kg,which obtains higher capacity and cycle stability than 13 m LiOAc electrolytes.

关 键 词：锂离子电池 电解液 储能 溶剂化作用 

分 类 号：TM911[电气工程—电力电子与电力传动]