Design and Synthesis of a Facile Solution-Processing and Ultrastable Crosslinkable Branched Nitroxide Polymer
Design and Synthesis of a Facile Solution-Processing and Ultrastable Crosslinkable Branched Nitroxide Polymer
复制标题
易于溶液加工且超稳定的可交联支化氮氧化物聚合物的设计与合成
DOI：
10.1002/macp.201900068
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发表时间：
2019
影响因子：
2.5
通讯作者：
Lu Jiang
中科院分区：
文献类型：
--
作者：
Qin Herong;Qin Herong;Huang Jianbing;Liang Hui;Zhang Zishou;Lu Jiang
氮氧化物聚合物用作正极材料的一个关键挑战是在加工过程中保持良好的溶解性，以及在充放电过程中保持良好的耐溶剂性。针对这一问题，本文通过甲基丙烯酸2，2，6，6-四甲基-4-哌啶酯、肉桂酰乙酯和乙二醇二甲基丙烯酸酯的可逆加成-断裂链转移共聚，然后用3-氯过氧苯甲酸氧化，设计并合成了一种新型的光交联型支化氮氧化物聚合物。合成的聚合物能以环境友好的工艺溶解在乙醇中，经紫外光照射后容易转变为对有机电解液具有高度抗性的交联型聚合物。交联型氮氧化物聚合物正极具有显著的循环稳定性，在10C倍率下1000次充放电循环容量保持率为90%，优于未交联型正极1000次容量保持率65%。
A general critical challenge for nitroxide polymers being used as cathode materials is keeping the good solubility during the processing and good solvent resistance during charging and discharging. To address this issue, herein, a new photo‐crosslinkable branched nitroxide polymer is designed and synthesized via reversible addition‐fragmentation chain transfer copolymerization of 2,2,6,6‐tetramethyl‐4‐piperidyl methacrylate, cinnamoyl ethyl methacrylate, and ethylene glycol dimethacrylate, followed by oxidation using 3‐chloroperoxybenzoic acid. The as‐synthesized polymer can dissolve in ethyl alcohol with environmental‐friendly processing, and then can easily change into crosslinked polymer with highly resistance to organic electrolyte after UV irradiation. The crosslinked nitroxide polymer‐based cathode achieves remarkable cycle stability with a capacity retention of 90% over 1000 charge–discharge cycles at 10 C current rate, superior to that of the un‐crosslinked one with capacity retention of 65% over 1000 cycles.