Preparation and performance of EVOLi-OMMT separator material for lithium ion battery

GONG Guifen; ZOU Minggui; CUI Weiwei; FAN Jinqiang; MA Xu

doi:10.13801/j.cnki.fhclxb.20210517.004

Volume 39 Issue 3

Mar. 2021

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GONG Guifen, ZOU Minggui, CUI Weiwei, et al. Preparation and performance of EVOLi-OMMT separator material for lithium ion battery[J]. Acta Materiae Compositae Sinica, 2022, 39(3): 1186-1193. doi: 10.13801/j.cnki.fhclxb.20210517.004

Citation:

GONG Guifen, ZOU Minggui, CUI Weiwei, et al. Preparation and performance of EVOLi-OMMT separator material for lithium ion battery[J]. Acta Materiae Compositae Sinica, 2022, 39(3): 1186-1193. doi: 10.13801/j.cnki.fhclxb.20210517.004

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Preparation and performance of EVOLi-OMMT separator material for lithium ion battery

doi: 10.13801/j.cnki.fhclxb.20210517.004

School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China

Received Date: 2021-03-19
Accepted Date: 2021-05-08
Rev Recd Date: 2021-04-26

Available Online: 2021-05-18

Publish Date: 2021-03-01

Abstract

Abstract

Using Poly (ethylene-vinyl alcohol) (EVOH) and Lithium montmorillonite (Li-OMMT), an ionic resin is synthesized first, and then compounded with the lithium montmorillonite to prepare a new organic-inorganic hybrid material EVOLi-OMMT. Electrospinning is used to make it into a non-woven fabric separator for lithium-ion batteries. The bonding structure of the hybrid material was first characterized by infrared, and the microstructure of the diaphragm was characterized by SEM. Then the two composite diaphragms synthesized were compared with the Celgard diaphragm for liquid absorption, porosity, thermal performance and electrical performance. The results show that a new chemical bond is formed between EVOLi and OMMT to form an intercalation cross-linked structure. The mechanical strength of the diaphragm is 68.12% higher than that of EVOLi. The pore diameter of the diaphragm is uniform. The modified diaphragm has a porosity and liquid absorption rate of 457% and 73% respectively, the initial temperature is higher, up to 270℃, and can withstand 175℃ without shrinkage; the electrochemical test results show that the modified membrane has a small ion interface migration resistance, which can be as low as 96.59 Ω; 100 times 0.1 C After the cycle, the capacity retention rate can reach 93.4%, and it shows excellent rate performance in the cycle test.
- lithium-ion battery,
- separator,
- hybrid material,
- electrospinning,
- poly(ethylene-vinyl alcohol) (EVOH),
- Lithium montmorillonite (Li-OMMT)
Long Abstrsct
Innovation Points

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References(32)

References

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