Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 329, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2021.111544
Keywords
Polydopamine; ZIF-8 coating; Separator; Thermal stability; Cycle stability
Categories
Funding
- National Natural Science Foundation of China [31770608]
- Jiangsu Specially-appointed Professorship Program [[2016] 20]
- Science and Technology Innovation Project for Overseas Students of Nanjing City (Ningrenshehan) [[2018]214]
- Postgraduate Research&Practice Innovation Program of Jiangsu Province [KYCX19_1087]
- University Scientific Research Project of Jiangsu Province [201810298075Y]
- Innovative training program for college students of Nanjing Forestry University [2018NFUSPITP176]
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The study proposes an effective approach to improve cycle stability and inhibit dendrite growth by exploring MOFs-based 3D-channeled separator through in-situ growth of ZIF-8 coating. By manipulating PLA membrane preparation and coating morphology, the biobased separator achieved excellent thermal stability and electrolyte uptake ability. The assembled Li-ion battery exhibited ultrahigh cycle stability and resistance to dendritic penetration, showing the potential for next generation energy storage devices with excellent cycle stability.
Lithium-ion batteries have been regarded as the most potential energy storage system due to their high energy density and theoretical capacity. However, conventional separators suffer from low electrolyte absorption, poor thermal and cycling stability, short circuits caused by dendrite growth. Herein, an effective approach was proposed to explore MOFs-based 3D-channeled separator via in-situ growth of ZIF-8 coating, which could significantly improve cycle stability and inhibit dendrite growth. Specifically, PLA membrane with 3D-channels was prepared by directional electrospinning and dopamine-induced assembling of MOFs in-situ growth onto the specified surface. By manipulating solvents, the desirable robustness of MOFs coatings could be accomplished through morphological assembly. Based on MOFs-architectured coating and microporosity, the excellent thermal stability (no change in size at 120 degrees C) and superior electrolyte uptake ability (290%) were finally obtained for the biobased separator. The assembled Li-ion battery exhibited ultrahigh cycle stability (capacity retention rate, 98.78% after 200 cycles at 1C rate) and preferable resistance to dendritic penetration, higher than those of the publicly reported. The excellent performance was attributed to the multiple 3D-channeled pathways for Li+ provided by MOFs and coating morphology. This study shows the potential for the development of next generation energy storage devices with excellent cycle stability.
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