摘要
全固态锂电池因其在安全性和能量密度方面的优势而被普遍认为是下一代储能设备。全固态电池中使用固态电解质取代了传统液态电池中的有机电解液,因而需要开发具备不同特性的新型正极活性材料。全固态锂电池中的固固接触需要活性物质具有良好的可变形性。此外,活性物质应当具备更高的离子电导率从而减少正极中离子导电剂的使用,进而获得更高的容量。本文报道了一种尖晶石型氯化物正极材料Li_(2-2x)Mn_(1-x)Zr_(x)Cl_(4),其具有良好的可变形性和高离子电导率(25℃下的离子电导率上至0.16 m S·cm^(-1))。使用具备最高离子电导率的组分LiMn_(0.5)Zr_(0.5)Cl_(4)作为正极组装的全固态电池在室温下实现了200圈的稳定循环。
All-solid-state Li batteries(ASSLBs)are now considered to be next-generation energy storage devices due to their advantages in safety and energy density.With liquid electrolytes replaced by solid electrolytes,novel cathode active materials(CAMs)with different characteristics are needed.The solid-solid contact in ASSLBs requires CAMs to have good deformability.In addition,higher ionic conductivity is also essential to reduce the mass of the Li-ion conductive agent,thus accessing a higher overall capacity.Herein,we report a spinel-type chloride cathode Li_(2-2x)Mn_(1-x)Zr_(x)Cl_(4),which has good deformability and high ionic conductivity(up to 0.16 mS·cm^(-1)at 25℃).The ASSLB using the optimal composi-tion of LiMn_(0.5)Zr_(0.5)Cl_(4)as the cathode exhibits promising cycling stability for 200 cycles at room temperature.
作者
郝继鹏
马骋
Jipeng Hao;Cheng Ma(Department of Materials Science&Engineering,University of Science and Technology of China,Hefei 230026,China)
基金
supported by the National Key R&D Program of China(2018YFA0209600,2017YFA0208300)
the National Natural Science Foundation of China(51802302)
the Fundamental Research Funds for the Central Universities(WK3430000006).
