基于LLZTO固态电解质的固态锂金属电池  

Solid-state lithium metal battery based on LLZTO solid-state electrolyte

作　　者：高捷 韩晓刚 GAO Jie;HAN Xiao-gang(State Grid Shanghai Electric Power Company,Shanghai 201899,China;State Key Lab of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an,Shaanxi 710049,China)

机构地区：[1]国网上海市电力公司,上海201899 [2]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049

出　　处：《电池》2023年第2期137-140,共4页Battery Bimonthly

摘　　要：有机液态电解质具有可燃性,存在起火甚至爆炸等安全隐患,有限的电化学窗口限制了锂金属负极和高电压正极的应用。采用固态电解质代替电解液和隔膜,有望解决安全问题,更宽的电化学窗口可匹配锂金属负极和高电压正极,较大幅度地提高电池的能量密度。采用高温固相法合成具有高离子电导率(8.14×10^(-4)S/cm)的锂镧锆钽氧(LLZTO)固态电解质。基于LLZTO电解质组装匹配镍锰酸锂(LNMO)高电压正极的锂金属电池,以0.05 C的倍率在3.5~5.3 V充放电,能稳定循环超过50次,放电比容量保持在100~120 mAh/g之间。Organic liquid electrolytes was flammable and had potential safety hazards such as fire and even explosion.Its limited electrochemical window limited the application of lithium metal anode and high-voltage cathode.The use of solid electrolyte instead of electrolyte and separator was expected to solve the safety problem.A wider electrochemical window could match the lithium metal anode and high-voltage cathode,which greatly improved the energy density of the battery.Lithium lanthanum zirconium tantalum oxide(LLZTO)solid electrolytes with high ionic conductivity(8.14×10-4 S/cm)were synthesized by high temperature solid state method.Lithium metal batteries matched with lithium nickel manganese oxide(LNMO)high-voltage cathodes were assembled based on LLZTO electrolytes.When charged and discharged at a rate of 0.05 C in 3.5-5.3 V,it could cycle steadily more than 50 times,the specific discharge capacity was maintained between 100-120 mAh/g.

关 键 词：电池安全性 能量密度 固态电解质 高电压正极 锂金属电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]