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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

Physical characterization of the membranes.SEM micrographs for (a) the surface and (b) the cross-section of the GFM, (c, d) the surface and (e) the cross-section of the PVDF-GFM composite membrane, and (f, g) EDX of the PVDF-GFM membrane.
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f1: Physical characterization of the membranes.SEM micrographs for (a) the surface and (b) the cross-section of the GFM, (c, d) the surface and (e) the cross-section of the PVDF-GFM composite membrane, and (f, g) EDX of the PVDF-GFM membrane.

Mentions: SEM micrographs of the GFM and the PVDF-GFM composite membrane are shown in Figure 1. From the surface and inner morphology of the GFM (Figure 1a and 1b), the pore size of the fibrous matrices is not uniform and the inner structure is very loose. In the case of the composite membrane, the pores of the fibrous matrix of the GFM are covered with PVDF and the inner space of the GFM membrane is also filled with PVDF matrix (Figure 1c and 1e). The pores on the surface of the composite membrane (Figure 1d) cannot be seen clearly. This indicates that the particles of electrodes in nano-size will not pass through the composite membrane while the Li+ ions can transport freely. This structure is of great importance to prevent possible micro short-circuit and help to improve the safety of LIBs, which is evidently advantageous over the commercial separator. The EDX analysis of the PVDF-GFM composite (Figure 1g) also shows that C, O, F and Si elements are observed on the inner GFM surface demonstrating that the GFM fibers are covered with PVDF.


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)

Physical characterization of the membranes.SEM micrographs for (a) the surface and (b) the cross-section of the GFM, (c, d) the surface and (e) the cross-section of the PVDF-GFM composite membrane, and (f, g) EDX of the PVDF-GFM membrane.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Physical characterization of the membranes.SEM micrographs for (a) the surface and (b) the cross-section of the GFM, (c, d) the surface and (e) the cross-section of the PVDF-GFM composite membrane, and (f, g) EDX of the PVDF-GFM membrane.
Mentions: SEM micrographs of the GFM and the PVDF-GFM composite membrane are shown in Figure 1. From the surface and inner morphology of the GFM (Figure 1a and 1b), the pore size of the fibrous matrices is not uniform and the inner structure is very loose. In the case of the composite membrane, the pores of the fibrous matrix of the GFM are covered with PVDF and the inner space of the GFM membrane is also filled with PVDF matrix (Figure 1c and 1e). The pores on the surface of the composite membrane (Figure 1d) cannot be seen clearly. This indicates that the particles of electrodes in nano-size will not pass through the composite membrane while the Li+ ions can transport freely. This structure is of great importance to prevent possible micro short-circuit and help to improve the safety of LIBs, which is evidently advantageous over the commercial separator. The EDX analysis of the PVDF-GFM composite (Figure 1g) also shows that C, O, F and Si elements are observed on the inner GFM surface demonstrating that the GFM fibers are covered with PVDF.

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