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.
Highlights
Cheap glass fiber mats as a matrix of gel polymer electrolytes for lithium ion batteries Yusong Zhu, Faxing Wang, Lili Liu, Shiyin Xiao, Yaqiong Yang & Yuping Wu
In the case of the composite membrane, the pores of the fibrous matrix of the glass fiber mats (GFMs) are covered with poly(vinylidene fluoride) (PVDF) and the inner space of the GFM membrane is filled with PVDF matrix (Figure 1c and 1e)
As the above shown, the GFM mainly consists of silicon dioxide which is thermally stable up to 400uC and the thermal stability of the composite membrane is mainly dependent on the PVDF
Summary
Cheap glass fiber mats as a matrix of gel polymer electrolytes for lithium ion batteries Yusong Zhu, Faxing Wang, Lili Liu, Shiyin Xiao, Yaqiong Yang & Yuping Wu. 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. 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. Gel PEs, which are formed by absorbing a large amount of liquid electrolytes in polymer matrices and have characteristics of both the solid and the liquid electrolytes, become the optimal choice[18] Their poor mechanical property and high cost restrict their application[10,11,19]. Lithium ion batteries require a separator with pore size in the range 0.03–0.1 mm, 30–60% porosity with high uniformity and acceptable mechanical strength[21]. Low cost, high-temperature stability and simple manufacture process make glass fiber mats of great attractions to the lithium ion batteries
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