期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 49, 页码 42348-42355出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b15505
关键词
safety; flame-retarding polymer matrix; gel polymer electrolyte; lithium ion batteries
资金
- Mitsui Chemicals
State-of-the-art (SOTA) liquid electrolyte/polyolefin separator setups used in lithium ion batteries (LIBs) suffer from the hazard of leakage and high flammability. To address these issues, phosphonate, a flame-retarding moiety, is chemically bonded to a polymer matrix to fabricate a nonflammable gel polymer electrolyte (GPE). The obtained phosphonate-based polymer matrix as well as its corresponding GPE (gelled with flammable SOTA nonaqueous liquid electrolyte) shows remarkable flame resistivity. Unlike poly(vinylidene fluoride-co-hexafluoropropylene)-based GPEs, the phosphonate-based GPE does not react with lithiated graphite at high temperatures. Both features indicate that the phosphonate-based GPE is superior to SOTA GPEs in the aspect of safety performance. As the flame-retarding moiety is chemically bonding to the polymer, the parasitic reactions between the flame retarding moiety and the electrodes are avoided. Consequently, LIB cells comprising phosphonate-based GPE show good capacity retention comparable to cells comprising SOTA GPEs. Compared with SOTA GPEs, phosphonate-based polymer-based GPEs show improved intrinsic safety performance and comparable cycle life. Therefore, phosphonate-based polymers exhibit high potential to be used as a new class of polymer matrix for GPE used in LIBs.
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