Investigation on the Copolymer Electrolyte of Poly(1,3-dioxolane-co-formaldehyde).,Macromolecular Rapid Communications

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Investigation on the Copolymer Electrolyte of Poly(1,3-dioxolane-co-formaldehyde).
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-04-06 , DOI: 10.1002/marc.202000047
Fengquan Liu ₁ , Ting Li ₁ , Yujie Yang ₁ , Jun Yan ₁ , Ning Li ₁ , Jinxin Xue ₁ , Hong Huo ₁ , Jianjun Zhou ₁ , Lin Li ₁

Affiliation

A series of copolymers are prepared via cationic ring-opening polymerization with 1,3-dioxolane (DOL) and trioxymethylene (TOM) as monomers. The crystallization behaviors of the copolymers can be suppressed by adjusting the ratio of DOL/TOM. With LiBF4 as a source for a BF3 initiator, copolymer electrolytes (CPEs) can be prepared in situ inside cells without needing nonelectrolyte catalysts or initiators. The ionic conductivities and Li+ diffusion coefficients ( D Li + ) of the CPEs increase with a decreasing DOL/TOM ratio in a certain range. The CPE with a DOL/TOM ratio of 8/2 has the highest ionic conductivity as well as D Li + and shows excellent interfacial compatibility with lithium (Li) metal anodes. Li-Li symmetric cells can be uniformly plated/stripped for more than 1200 h. Furthermore, LiFePO4 -Li cells with 8/2-CPE display stable cycling performance for over 400 cycles. This strategy is a promising approach for the preparation of high-performance polymer electrolytes and is sure to promote their application in Li metal batteries.

中文翻译：

聚（1,3-二氧戊环-共甲醛）共聚物电解质的研究。

通过以1，3-二氧戊环（DOL）和三甲醛（TOM）为单体的阳离子开环聚合反应制备了一系列共聚物。通过调节DOL / TOM的比例可以抑制共聚物的结晶行为。使用LiBF4作为BF3引发剂的来源，可以在电池内部原位制备共聚物电解质（CPE），而无需非电解质催化剂或引发剂。CPE的离子电导率和Li +扩散系数（D Li +）在一定范围内随DOL / TOM比的降低而增加。DOL / TOM比为8/2的CPE具有最高的离子电导率以及D Li +，并且与锂（Li）金属阳极具有出色的界面相容性。Li-Li对称电池可均匀铺板/剥离超过1200小时。此外，具有8 / 2-CPE的LiFePO4-Li电池在超过400个循环中显示出稳定的循环性能。该策略是制备高性能聚合物电解质的有前途的方法，并且肯定会促进它们在锂金属电池中的应用。

更新日期：2020-04-06

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