低成本Nb掺杂Li7La3Zr2O12固态电解质的性能与应用研究
Properties and application of low-cost Nb-doped Li7La3Zr2O12 solid electrolyte
冯玉川 1张鑫 2王明辉 3何泓材 4林元华1
作者信息
- 1. 清华大学材料学院,北京 100084
- 2. 景德镇陶瓷大学材料科学与工程学院,江西景德镇 333403
- 3. 清陶(昆山)能源发展股份有限公司清陶新能源材料研究院,江苏昆山 215300;宜春清陶能源科技有限公司,江西宜春 336000
- 4. 清陶(昆山)能源发展股份有限公司清陶新能源材料研究院,江苏昆山 215300;苏州清陶新能源科技有限公司,江苏昆山 215300
- 折叠
摘要
固态电池因其在能量密度、循环寿命和安全性等方面的优异性能受到关注.其核心组件为固态电解质材料.具有石榴石结构的Li7La3Zr2O12(LLZO)氧化物固态电解质由于具备宽电化学窗口、良好的离子传导性、稳定的化学性能及简单的制备工艺等特点而得到广泛研究.本研究采用Nb元素对LLZO进行掺杂,成功制备得到Li6.75La3Zr1.75Nb0.25O12(LLZNO)氧化物固态电解质,其离子电导率达到了7.79×10-4 S/cm,且制备成本与未掺杂的LLZO相比无明显增加.将其涂覆在聚乙烯(PP)隔膜表面形成PP-LLZNO隔膜,表现出良好的热稳定性和离子电导率.与Al2O3涂覆隔膜或固态电解质Li6.75La3Zr1.75Ta0.25O12(LLZTO)涂覆隔膜组装的电池相比,组装了PP-LLZNO涂覆隔膜的扣式电池和软包电池的容量保持率分别达到了84.99％(50圈)和57.40％(100圈),展现出更优异的性能.因此,高离子电导率和低成本LLZNO的制备对固态电解质的大规模生产及在固态电池中的广泛应用具有一定的参考意义.
Abstract
Solid-state batteries have attracted considerable attention due to their outstanding performance in energy density,cycle life and safety.The core component of such batteries is the solid electrolyte material.Oxide solid electrolytes with garnet structure,such as Li7La3Zr2O12(LLZO),have been widely studied due to their broad electrochemical stability window,excellent ion conductivity,chemical stability and straightforward fabrication process.In this study,Nb doping was employed to modify LLZO,leading to the successful synthesis of Li6.75La3Zr1.75Nb0.25O12(LLZNO)oxide solid electrolyte.It exhibited an ion conductivity of 7.79×10-4 S/cm without significant increase in the fabrication cost.This material was coated onto the surface of polyethylene(PP)membranes to form PP-LLZNO membranes,which demonstrated excellent thermal stability and ion conductivity.Compared with the batteries assembled with Al2O3 coated membranes or solid electrolyte Li6.75La3Zr.75Ta0.25O12(LLZTO)coated membranes,the button cells and pouch cells assembled with PP-LLZNO coated membranes showed superior capacity retention rates of 84.99％(50 cycles)and 57.40％(100 cycles),respectively.This work provides reference for the large-scale production of solid electrolytes and its application in solid-state batteries.
关键词
固态电池/Li7La3Zr2O12/Nb掺杂/固态电解质涂覆隔膜/软包电池Key words
solid-state battery/Li7La3Zr2O12/Nb doping/solid electrolyte coated membrane/pouch cell引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据