凝胶型锂离子电池的制作及电化学和安全性能  

Fabrication of gel-type Li-ion batteries and their electrochemical and safety properties

作　　者：涂健 徐雄文 胡海波 聂阳 曾涛 孙秋实 成浩 谢健[2] 赵新兵[2] TU Jian;XU Xiongwen;HU Haibo;NIE Yang;ZENG Tao;SUN Qiushi;CHENG Hao;XIE Jian;ZHAO Xinbing(Hunan Cube New Energy Technology Co.Ltd.,Zhuzhou 412000,Hunan,China;School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China)

机构地区：[1]湖南立方新能源科技有限责任公司,湖南株洲412000 [2]浙江大学材料科学与工程学院,浙江杭州310027

出　　处：《储能科学与技术》2021年第3期1025-1031,共7页Energy Storage Science and Technology

基　　金：湖南省重大科技项目(2020GK1014);国家自然科学基金项目(51572238);浙江省自然科学基金(LY19E020013)。

摘　　要：采用原位聚合法制备了凝胶型软包锂离子电池,该电池包括钴酸锂正极、石墨负极、镀陶瓷聚乙烯隔膜,以及弥散于正负极和隔膜之间的凝胶电解质。电化学测试表明,凝胶型电池具有和液态电池可比的容量和循环稳定性。差示扫描量热(DSC)测试表明,相对于液态电解质,凝胶电解质与钴酸锂正极和石墨负极之间的热稳定性更好。热板和加速量热(ARC)试验表明,凝胶电池具有更好的安全性能。采用原位聚合法制作了超薄软包电池,该电池显示出较好的柔性,经折叠和剪切试验后该电池仍可正常工作。Pouch-type gel Li-ion batteries were fabricated by in-situ polymerization and constructed from a LiCoO_(2) cathode,a graphite anode,a ceramics-coated polyethylene separator,and a gel electrolyte that was dispersed in between.Electrochemical tests showed that the battery using the gel electrolyte exhibited comparable capacity and cycling stability compared with that using the liquid electrolyte.The differential scanning calorimeter tests indicated that the gel electrolyte exhibited an improved thermal stability toward LiCoO_(2) and graphite than the liquid electrolyte.The hot-plate and accelerating rate calorimetry tests suggested that the safety property of the battery can be enhanced using gel electrolytes instead of liquid electrolytes.An ultrathin pouch battery was also fabricated by in-situ polymerization,and it showed good flexibility and can still operate after folding and cutting.

关 键 词：锂二次电池 凝胶电解质 聚季戊四醇三丙烯酸酯 原位聚合 钴酸锂 

分 类 号：TM911[电气工程—电力电子与电力传动]