Study on performance of composite polymer films doped with modified molecular sieve for lithium-ion batteries |
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Authors: | Yuqing Zhang Guodong Zhang Tingdong Du Lizao Zhang |
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Affiliation: | School of Chemical Engineering and Technology, Tianjin University, Weijin Road 92#, Nankai District, 300072, Tianjin, China |
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Abstract: | To improve the tensile strength and ionic conductivity of composite polymer films for lithium-ion batteries, molecular sieves of MCM-41 modified with sulfated zirconia (SO42−/ZrO2, SZ), denoted as MCM-41/SZ, were doped into a poly(vinylidene fluoride) (PVdF) matrix to fabricate MCM-41/SZ composite polymer films, denoted as MCM-41/SZ films. Examination by transmission electron microscope (TEM) shows that modified molecular sieves have lower aggregation and a more porous structure. Tensile strength tests were carried out to investigate the mechanical performance of MCM-41/SZ films, and then the electrochemical performance of batteries with MCM-41/SZ films as separators was tested. The results show that the tensile strength (σt) of MCM-41/SZ film was up to 7.8 MPa; the ionic conductivity of MCM-41/SZ film was close to 10−3 S cm−1 at room temperature; and the coulombic efficiency of the assembled lithium-ion battery was 92% at the first cycle and reached as high as 99.99% after the 20th cycle. Meanwhile, the charge-discharge voltage plateau of the lithium-ion battery presented a stable state. Therefore, MCM-41/SZ films are a good choice as separators for lithium-ion batteries due to their high tensile strength and ionic conductivity. |
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Keywords: | Lithium-ion battery Modified molecular sieve Composite polymer film Tensile strength Ionic conductivity |
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