1. Study on cellulose nanofibers/aramid fibers lithium-ion battery separators by the heterogeneous preparation method.
- Author
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Liu, Xin, Qin, Menghua, Sun, Wei, Zhang, Dailiang, Jian, Binbin, Sun, Zhonghua, Wang, Shujie, and Li, Xiang
- Subjects
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ARAMID fibers , *LITHIUM-ion batteries , *CELLULOSE , *NANOFIBERS , *IONIC conductivity , *POROSITY , *POLYIMIDES - Abstract
In this study, a heat-resistant and high-wettability lithium-ion batteries separator (PI-CPM-PI) composed of cellulose nanofibers (CNF) and aramid fibers (PMIA chopped fiber/PPTA pulp) with the reinforced concrete structure was fabricated via a traditional heterogeneous paper-making process. CNF played crucial roles in optimizing the pore structure and improving the wettability of PI-CPM-PI separator. The effects of composition on separator properties were investigated and the results indicated that the optimal compositions were 0.5 wt% CNF, 0.5 wt% PMIA chopped fiber/PPTA pulp (ratio of 5:5), 0.05 wt% diatomite and 1.5 wt% polyimide. Relevant tests demonstrated that the performance advantages of PI-CPM-PI separators were exhibited at the wettability and thermal stability compared to the commercial separator (PP). Additionally, batteries assembled with PI-CPM-PI separators showed excellent electrochemical and cycling performance (ionic conductivity of 1.041 mS.cm−1, the first discharge capacity of 158.2 mAh.g−1 at 0.2C and capacity retention ratio of 99.76 % after 100 cycles). • CPM membrane was prepared by heterogeneous process with vacuum assisted filtration. • PI-CPM-PI separator had function design of reinforced concrete structure. • PI-PI micro-crosslinking structure was formed by spraying and mixing method. • The DTM caused the enhancement of wettability and thermal stability of separators. • PI-CPM-PI separator had good wettability, thermal stability and electrochemical. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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