Development of a thin flexible Li battery design with a new gel polymer electrolyte operating at room temperature

JOURNAL OF POWER SOURCES

卷:482

Article

Porthault, H.¹  Calberg, C.²  Amiran, J.¹  Martin, S.¹  Paez, C.²  Job, N.²  Heinrichs, B.²  Liquet, D.³  Salot, R.¹ 

[1] Univ Grenoble Alpes, LETI, CEA, MINATEC Campus, F-38054 Grenoble, France

[2] Univ Liege, Dept Chem Engn Nanomat, Electrochem, Catalysis, B6a Quartier Agora,13 Allee 6 Aout, B-4000 Liege, Belgium

[3] Prayon SA, 144 Rue J Wauters, B-4480 Engis, Belgium

关键词: Gel polymer electrolyte;    IoT;    Battery design;    Lithium metal battery;   

DOI  :  10.1016/j.jpowsour.2020.229055

来源: Elsevier

【 摘 要 】

In this study, we develop a new Li-metal battery design merging with IoT requirements, mainly the low thickness, the thermal stability and the flexibility. To reach these specifications, we firstly prepared an efficient gel polymer electrolyte (GPE) composed of a PVDF-HFP polymer network, a LiFSI: Pyr13FSI liquid binary solution and a lithium montmorillonite Li-MMT clay. The as-synthesized material exhibits a high ionic conductivity (0.48 mS cm(-1) at 25 degrees C) and a good thermal stability, up to 140 degrees C. In parallel, a new battery design with an optimized ratio of packaging to active material thickness is developed. In this design, copper foils act both as current collector and as battery casing, decreasing the overall cell thickness. Li metal batteries are realized using the developed GPE material and this new battery design. The cell thickness is 360 and 760 mu m for single side and double-sided architectures respectively. These batteries show well functioning under high bending and exhibit a good cycling ability with a remaining capacity higher than 85% after more than 200 cycles at 25 degrees C. Thanks to the combination of the original Cu packaging and the flexible GPE membrane, developed Li-metal batteries exhibit promising properties to merge with the new IoT requirements.

【 授权许可】

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