Application of Li6.4La3Zr1.45Ta0.5Mo0.05O12/PEO Composite Solid Electrolyte in High-Performance Lithium Batteries

Chengjun Lin; Yaoyi Huang; Dingrong Deng; Haiji Xiong; Bin Lu; Jianchun Weng; Xiaohong Fan; Guifang Li; Ye Zeng; Yi Li; Qihui Wu

doi:10.3390/ma17133094

Application of Li_6.4La₃Zr_1.45Ta_0.5Mo_0.05O₁₂/PEO Composite Solid Electrolyte in High-Performance Lithium Batteries

Materials (Basel). 2024 Jun 24;17(13):3094. doi: 10.3390/ma17133094.

Authors

Chengjun Lin¹, Yaoyi Huang², Dingrong Deng¹, Haiji Xiong¹, Bin Lu¹, Jianchun Weng¹, Xiaohong Fan¹, Guifang Li¹, Ye Zeng¹, Yi Li³, Qihui Wu¹

Affiliations

¹ College of Marine Equipment and Mechanical Engineering and Xiamen Key Lab of Marine Corrosion and Smart Protective Materials, Jimei University, Xiamen 361021, China.
² College of Resources and Environmental Sciences, Quanzhou Normal University, Quanzhou 362000, China.
³ Jiangsu Key Lab of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215125, China.

Abstract

Replacing the flammable liquid electrolytes with solid ones has been considered to be the most effective way to improve the safety of the lithium batteries. However, the solid electrolytes often suffer from low ionic conductivity and poor rate capability due to their relatively stable molecular/atomic architectures. In this study, we report a composite solid electrolyte, in which polyethylene oxide (PEO) is the matrix and Li_6.4La₃Zr_1.45Ta_0.5Mo_0.05O₁₂ (LLZTMO) and Li_6.4La₃Zr_1.4Ta_0.6O₁₂ (LLZTO) are the fillers. Ta/Mo co-doping can further promote the ion transport capacity in the electrolyte. The synthesized composite electrolytes exhibit high thermal stability (up to 413 °C) and good ionic conductivity (LLZTMO-PEO 2.00 × 10^-4 S·cm^-1, LLZTO-PEO 1.53 × 10^-4 S·cm^-1) at 35 °C. Compared with a pure PEO electrolyte, whose ionic conductivity is in the range of 10^-7~10^-6 S·cm^-1, the ionic conductivity of composite solid electrolytes is greatly improved. The full cell assembled with LiFePO₄ as the positive electrode exhibits excellent rate performance and good cycling stability, indicating that prepared solid electrolytes have great potential applications in lithium batteries.

Keywords: LLZTMO; composite electrolyte; polyethylene oxide; solid lithium batteries.

Grants and funding

This study was financially supported by NSFC (22172062, 22379051) and by the Fund of Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials.