Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (10): 3090-3099.doi: 10.19799/j.cnki.2095-4239.2022.0113

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Preparation and properties study of glass fiber cloth-based multilayer composite solid electrolyte

Minhui LIAO1,2(), Daxiang YANG1,2,3(), Yang ZHOU1,2, Renjie WAN3, Ruiping LIU4, Qiang WANG1,2,3   

  1. 1.The Green Aerotechnics Research Institute of Chongqing Jiaotong University
    2.Chongqing Key Laboratory of Green Aviation Energy and Power
    3.Chongqing Jiaotong University, Chongqing 401120, China
    4.China Mining University, Beijing 100083, China
  • Received:2022-03-04 Revised:2022-03-07 Online:2022-10-05 Published:2022-10-10
  • Contact: Daxiang YANG E-mail:939551239@qq.com;361425973@qq.com

Abstract:

Lithium bistrifluoromethanesulfonimide (LiTFSI) was used as a lithium salt. Glass fiber cloth, polyethylene oxide (PEO), 1-ethyl-3-methylimidazole bis-trifluoromethanesulfonimide salt ([EMIM]TFSI) and LLZO nanoparticles were used as raw materials. Glass fiber-based multilayer composite solid electrolyte membranes with different LLZO contents were prepared by the solution casting method. Enlarging the amorphous phase region of PEO and improving the interface compatibility of the film can improve the ionic conductivity of the film, and at the same time, using Si-O and -OH functional groups on the surface of glass fiber cloth can guide the uniform deposition of lithium ions and inhibit the growth of lithium dendrites. The results show that under the condition of 30 ℃, the ionic conductivity of glass fiber cloth/PEO/ILs/LLZO (SPE) composite solid electrolyte membrane with a weight ratio of 5% LLZO is 3.53 × 10-4S/cm, and the working voltage window is 5.18 V. The Li+ migration number is 0.33. The prepared LFP/SPE/Li and NCM622/SPE/Li solid state batteries have a discharge capacity of 165 mAh/g and 226 mAh/g at 0.1 C, respectively. Among them, the LFP/SPE/LI battery circulates 120 cycles at 0.5 C, a discharge capacity of 120 mAh/g, and a capacity retention rate of 99.8%. In addition, the impedance change is small before and after cycling, and it has excellent interfacial stability.

Key words: multilayer composite solid electrolyte membrane, glass fiber cloth, [EMIM]TFSI, ionic conductivity, solid state battery

CLC Number: