Designing Comb-Chain Crosslinker-Based Solid Polymer Electrolytes for Additive-Free All-Solid-State Lithium Metal Batteries
Designing Comb-Chain Crosslinker-Based Solid Polymer Electrolytes for Additive-Free All-Solid-State Lithium Metal Batteries
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DOI：
10.1021/acs.nanolett.0c03033
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发表时间：
2020-09-09
期刊：
影响因子：
10.8
通讯作者：
Li, Christopher Y.
中科院分区：
文献类型：
--
作者：
Li, Xiaowei;Zheng, Yongwei;Li, Christopher Y.
开发固体聚合物电解质是实现实用化无枝晶锂金属电池的有效途径。调节纳米聚合物网络化学对于SPE设计至关重要。在这项工作中，我们吸取了橡胶化学的教训，使用预成型聚合物作为多功能交联剂开发了一系列基于梳状链交联剂的SPE（ConSPE）。高官能度交联剂增加了纳米级交联域的连接性，这导致具有显著改善的韧性和上级锂枝晶电阻的坚固网络，即使在2 mA cm（-2）的电流密度下。均匀且柔性的网络还显著地将阳极稳定性提高到相对于Li/Li+超过5.3V。具有ConSPE的无添加剂的全固态LMB显示出高放电容量和高达10 C速率的稳定循环，并且可以在25 ℃下稳定循环。我们的研究结果表明，ConSPE是有前途的高性能和树枝状无LMB。
Developing solid polymer electrolytes (SPEs) is a promising approach to realize practical dendrite-free lithium metal batteries (LMBs). Tuning the nanoscale polymer network chemsitry is of critical importance for SPE design. In this work, we took lessons from the rubber chemistry and developed a series of comb-chain crosslinker-based SPEs (ConSPEs) using a preformed polymer as the multifunctional crosslinker. The high-functionality crosslinker increased the connectivity of nanosized cross-linked domains, which led to a robust network with dramatically improved toughness and superior lithium dendrite resistance even at a current density of 2 mA cm(-2). The uniform and flexile network also dramatically improved the anodic stability to over 5.3 V versus Li/Li+. Additive-free, all-solid-state LMBs with the ConSPE showed high discharge capacity and stable cycling up to 10 C rate, and could be stably cycled at 25 degrees C. Our results demonstrated that ConSPEs are promising for high-performance and dendrite-free LMBs.