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Cheap glass fiber mats as a matrix of gel polymer electrolytes for lithium ion batteries.

Zhu Y, Wang F, Liu L, Xiao S, Yang Y, Wu Y - Sci Rep (2013)

Bottom Line: Gel polymer electrolytes (GPEs) have been tried to replace the organic electrolyte to improve their safety.However, the application of GPEs is handicapped by their poor mechanical strength and high cost.The results show this gel-type composite membrane has great attraction to the large-capacity LIBs requiring high safety with low cost.

View Article: PubMed Central - PubMed

Affiliation: New Energy and Materials Laboratory (NEML), Department of Chemistry & Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China.

ABSTRACT
Lithium ion batteries (LIBs) are going to play more important roles in electric vehicles and smart grids. The safety of the current LIBs of large capacity has been remaining a challenge due to the existence of large amounts of organic liquid electrolytes. Gel polymer electrolytes (GPEs) have been tried to replace the organic electrolyte to improve their safety. However, the application of GPEs is handicapped by their poor mechanical strength and high cost. Here, we report an economic gel-type composite membrane with high safety and good mechanical strength based on glass fiber mats, which are separator for lead-acid batteries. The gelled membrane exhibits high ionic conductivity (1.13 mS cm(-1)), high Li(+) ion transference number (0.56) and wide electrochemical window. Its electrochemical performance is evaluated by LiFePO4 cathode with good cycling. The results show this gel-type composite membrane has great attraction to the large-capacity LIBs requiring high safety with low cost.

No MeSH data available.


Related in: MedlinePlus

The flame retarding ability of the membranes.The combustion test of (a, c) the Celgard 2730 and (b, d) the PVDF-GFM composite membrane.
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f3: The flame retarding ability of the membranes.The combustion test of (a, c) the Celgard 2730 and (b, d) the PVDF-GFM composite membrane.

Mentions: The combustion test of Celgard 2730 and the PVDF-GFM membrane is shown in Figure 3. When the commercial separator of Celgard 2730 was put on the fire, the separator shrank immediately and got on fire in a short time (< 3 s) (Figure 3c). This is similar to the other traditional separator due to the existence of combustible polyolefin matrix such polyethylene and polypropylene. The composite membrane shows perfect flame retarding ability. It did not catch on fire and also not shrink when putting on the fire (Figure 3d) because the components in the composite membrane are SiO2 and PVDF, which have flame retarding ability. The composite membrane shows acceptable mechanical property, which is very important for practical application of LIBs (Supplementary Fig. S1). The maximums of stress and strain of the PVDF-GFM composite are 14.3 MPa and 1.8%, respectively. After gelled to get GPE PVDF-GFM, the mechanical strength of the composite does not change.


Cheap glass fiber mats as a matrix of gel polymer electrolytes for lithium ion batteries.

Zhu Y, Wang F, Liu L, Xiao S, Yang Y, Wu Y - Sci Rep (2013)

The flame retarding ability of the membranes.The combustion test of (a, c) the Celgard 2730 and (b, d) the PVDF-GFM composite membrane.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3824160&req=5

f3: The flame retarding ability of the membranes.The combustion test of (a, c) the Celgard 2730 and (b, d) the PVDF-GFM composite membrane.
Mentions: The combustion test of Celgard 2730 and the PVDF-GFM membrane is shown in Figure 3. When the commercial separator of Celgard 2730 was put on the fire, the separator shrank immediately and got on fire in a short time (< 3 s) (Figure 3c). This is similar to the other traditional separator due to the existence of combustible polyolefin matrix such polyethylene and polypropylene. The composite membrane shows perfect flame retarding ability. It did not catch on fire and also not shrink when putting on the fire (Figure 3d) because the components in the composite membrane are SiO2 and PVDF, which have flame retarding ability. The composite membrane shows acceptable mechanical property, which is very important for practical application of LIBs (Supplementary Fig. S1). The maximums of stress and strain of the PVDF-GFM composite are 14.3 MPa and 1.8%, respectively. After gelled to get GPE PVDF-GFM, the mechanical strength of the composite does not change.

Bottom Line: Gel polymer electrolytes (GPEs) have been tried to replace the organic electrolyte to improve their safety.However, the application of GPEs is handicapped by their poor mechanical strength and high cost.The results show this gel-type composite membrane has great attraction to the large-capacity LIBs requiring high safety with low cost.

View Article: PubMed Central - PubMed

Affiliation: New Energy and Materials Laboratory (NEML), Department of Chemistry & Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China.

ABSTRACT
Lithium ion batteries (LIBs) are going to play more important roles in electric vehicles and smart grids. The safety of the current LIBs of large capacity has been remaining a challenge due to the existence of large amounts of organic liquid electrolytes. Gel polymer electrolytes (GPEs) have been tried to replace the organic electrolyte to improve their safety. However, the application of GPEs is handicapped by their poor mechanical strength and high cost. Here, we report an economic gel-type composite membrane with high safety and good mechanical strength based on glass fiber mats, which are separator for lead-acid batteries. The gelled membrane exhibits high ionic conductivity (1.13 mS cm(-1)), high Li(+) ion transference number (0.56) and wide electrochemical window. Its electrochemical performance is evaluated by LiFePO4 cathode with good cycling. The results show this gel-type composite membrane has great attraction to the large-capacity LIBs requiring high safety with low cost.

No MeSH data available.


Related in: MedlinePlus