期刊
JOURNAL OF MEMBRANE SCIENCE
卷 565, 期 -, 页码 50-60出版社
ELSEVIER
DOI: 10.1016/j.memsci.2018.07.094
关键词
Lithium ion battery separator; Shutdown property; Stability; Poly(ether ether ketone); Polymethyl methacrylate
资金
- National Nature Science Foundation of China [51274130]
- Ministry of Science and Technology Special Fund for Innovative Technology [2015IM040100]
- Tsing-Feng Front-Loading Scholarship of Tsinghua University
This paper presents a tri-layer membrane featured with double amido functionalized poly(ether ether ketone) outer layers and a poly(methyl methacrylate) interlayer and its application as a lithium ion battery separator. On one hand, the outer layers possess outstanding stability and endurance, which helps the tri-layer membrane to resist harsh conditions. On the other hand, the fusible interlayer can melt to block the pores of membrane once temperature is higher than 100 degrees C, which helps to prevent the lithium ion transmission between electrodes to terminate reactions in LIB. As a result, the tri-layer membrane exhibits remarkable features, including high maximum service temperature (350 degrees C), no area shrinkage at 150 degrees C, and wide shutdown temperature window (100-270 degrees C). The high stability and the shutdown property can avoid the thermal runaway of lithium ion battery, and greatly improve the safety. In addition, the wettability of the membrane is dramatically increased (contact angle= 0 degrees, vs. electrolyte) due to the strong interaction between polar polymer matrix and polar electrolyte, and the ionic conductivity of tri-layer membrane is 25.8% higher than the Celgard-2325 membrane at 30 degrees C (the 25 mu m PP/PE/PP tri-layer membrane). The discharge capacity of LIB-NW-CA/P/CA is 3.7%, 7.6%, 9.7%, 12.2%, 13.5% and 54.3% higher than that of LIB-Celgard at 0.1 C, 0.2 C, 0.5 C, 1 C, 2 C and 5 C, respectively.
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