Hantao Xu, Wei Deng, Jingyuan Yu, Lei Shi, Wenwei Zhang, Juncai Long, Chaobin He, Lin Xu
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引用次数: 0
摘要
与传统的固体聚合物电解质相比,聚碳酸酯基电解质具有更宽的电化学窗口和可观的离子电导率,是固态锂金属电池(lmb)的理想电解质。然而,聚碳酸酯与金属锂会发生严重的界面副反应,导致聚合物的界面降解。本文通过侧链的原位锚定设计了一种自发形成的受限构象,以抑制聚碳酸酯基电解质的界面降解。受限制的构象使侧链能够屏蔽和保护环状碳酸盐的可降解酯键,抑制聚碳酸酯和锂金属阳极之间的接触和界面降解。作为概念验证,在0.5 mA cm-2的电流密度下,受保护的聚碳酸酯基电解质显示了Li/Li电池超过1000小时的稳定循环能力,并且组装的LiNi0.8Co0.1Mn0.1O2/Li袋状电池也实现了类似的循环性能改善。这项工作表明,通过锚定侧链构建受限构象的策略是制造高稳定聚碳酸酯基固态lmb的可行途径。
Anchoring Side Chains to Carbonate Groups for Reviving Stable Polycarbonate-Based Solid-State Lithium Metal Batteries
Polycarbonate-based electrolytes are ideal electrolytes for solid-state lithium metal batteries (LMBs) due to their wider electrochemical windows and considerable ionic conductivities compared with conventional solid polymer electrolytes. However, polycarbonates encounter severe interfacial side reactions with lithium metal, leading to the interfacial degradation of polymers. Herein, a spontaneously formed restricted conformation is designed via the in situ anchoring of side chains to suppress the interfacial degradation of polycarbonate-based electrolytes. The restricted conformation enables the side chains to shield and protect the degradable ester bonds of cyclic carbonates, suppressing contact and interfacial degradation between polycarbonates and lithium metal anodes. As a proof of concept, the protected polycarbonate-based electrolyte demonstrates a stable cycling capability of the Li/Li cell beyond 1000 h at a current density of 0.5 mA cm–2, and the assembled LiNi0.8Co0.1Mn0.1O2/Li pouch cell also achieves similar improvement in cycling performance. This work indicates that the strategy of constructing restricted conformations via anchoring side chains is a feasible avenue for fabricating highly stable polycarbonate-based solid-state LMBs.
期刊介绍:
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