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Triallyl cyanurate copolymerization delivered nonflammable and fast ion conducting elastic polymer electrolytes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-27 , DOI: 10.1039/d2ta06723d
Dashan Zhang 1, 2 , Yongzheng Shi 1, 2 , Junwei An 3, 4 , Shubin Yang 1 , Bin Li 1, 2
Affiliation  

Although solid polymer electrolytes (SPEs) possess competitive advantages of excellent processability and good interfacial contact with electrodes over rigid and fragile inorganic solid electrolytes, the unsatisfactory ionic conductivities and undesired flammability issues still impede their practical applications. In this report, derived from the vulcanized nitrile butadiene rubber (v-NBR) matrix, a nonflammable, elastic, and fast lithium ion conducting SPE (v-NBR/TAC/IL) is developed via introducing the triallyl cyanurate crosslinking agent and an ionic liquid plasticizer. The abundant C[double bond, length as m-dash]C bonds and triazines in the triallyl cyanurate agent are utilized as vulcanization accelerators to cross link the NBR matrices and as flame retardants to inhibit the combustion of the electrolyte, respectively. Furthermore, the electronegative nitrogen atoms in triallyl cyanurate can help delocalizing lithium salts, facilitating the dissociation and transportation of lithium ions. Therefore, the resultant rubber-based polymer electrolyte exhibits excellent flame retardancy, good mechanical properties (0.58 MPa, 162% elongation) and high ionic conductivity (1.8 × 10−4 S cm−1 at room temperature). Consequently, the lithium symmetrical battery with v-NBR/TAC/IL electrolyte exhibits a long plating/stripping cycling for up to 1500 h, and the full battery of Li|v-NBR/TAC/IL|LiFePO4 displays a high specific capacity of 132.6 mA h g−1 and a long cycling life over 250 cycles.

中文翻译:

氰脲酸三烯丙酯共聚提供不易燃和快速离子导电的弹性聚合物电解质

尽管固体聚合物电解质(SPEs)与刚性和易碎的无机固体电解质相比,具有优异的加工性能和与电极良好的界面接触等竞争优势,但离子电导率不理想和易燃性问题仍然阻碍了它们的实际应用。本报告以硫化丁腈橡胶 (v-NBR) 为基体,通过引入氰脲酸三烯丙酯交联剂和离子液体增塑剂。丰富的C[双键,长度为 m-dash]氰脲酸三烯丙酯试剂中的 C 键和三嗪分别用作硫化促进剂以交联 NBR 基体,并用作阻燃剂以抑制电解质的燃烧。此外,氰脲酸三烯丙酯中的负电性氮原子有助于锂盐离域,促进锂离子的解离和传输。因此,所得橡胶基聚合物电解质表现出优异的阻燃性、良好的机械性能(0.58 MPa,162% 伸长率)和高离子电导率(室温下为1.8 × 10 -4 S cm -1 )。因此,采用 v-NBR/TAC/IL 电解质的锂对称电池表现出长达 1500 小时的长电镀/剥离循环,而 Li|v-NBR/TAC/IL|LiFePO 的完整电池图4显示132.6 mA hg -1的高比容量和超过250个循环的长循环寿命。
更新日期:2022-09-27
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