Decoupling the Modulus and Toughness Effects of Solid Polymer Electrolytes in All-Solid-State Lithium Batteries
Decoupling the Modulus and Toughness Effects of Solid Polymer Electrolytes in All-Solid-State Lithium Batteries
复制标题
解耦全固态锂电池中固体聚合物电解质的模量和韧性影响
DOI：
10.1021/acsaem.1c02857
复制
发表时间：
2021
影响因子：
6.4
通讯作者：
Li, Christopher Y.
中科院分区：
文献类型：
--
作者：
Zheng, Yongwei;Li, Xiaowei;Fullerton, William R.;Li, Christopher Y.
固体聚合物电解质（SPE）在全固态锂电池（ASSLB）应用中引起了越来越多的关注。以前的 SPE 设计一直侧重于在不牺牲离子电导率的情况下提高聚合物剪切模量，而最近的发展表明，弹性和韧性等其他机械性能也很重要。不幸的是，SPE 中的韧性和模量常常交织在一起，并且韧性在 SPE 性能中的确切作用仍然难以捉摸。在这项工作中，我们将超高分子量聚环氧乙烷引入到基于 PEO 的网络 SPE 中，形成半互穿网络 (s-IPN) SPE。这种设计使 s-IPN SPE 能够实现显着的韧性变化，同时保留相似的离子电导率和模量，从而有效地消除韧性和模量的影响。我们的结果表明，增加韧性可以显着提高锂对称电池的循环寿命。还实现了出色的库仑效率和完整的电池性能。因此，这项工作表明韧性应该成为未来 SPE 设计的重要标准。
Solid polymer electrolytes (SPEs) have attracted increasing attention for all solid-state lithium battery (ASSLB) applications. Previous SPE design has been focusing on improving the polymer shear modulus without sacrificing ionic conductivity, whereas recent development suggests that other mechanical properties such as elasticity and toughness are also important. Unfortunately, the toughness and modulus are often intertwined in SPEs, and the exact role of toughness in SPE performance remains elusive. In this work, we introduce ultrahigh-molecular-weight poly(ethylene oxide) to a PEO-based network SPE to form semi-interpenetrating network (s-IPN) SPEs. This design allows for the s-IPN SPEs to achieve a significant toughness change while retaining similar ionic conductivities and moduli, which effectively decouples the toughness and modulus effects. Our results show that increasing toughness can significantly improve lithium symmetric cell cycling life. Excellent Coulombic efficiency and full battery performance have also been achieved. This work therefore demonstrates that toughness should be an important criterion for future SPE design.
影响因子：
16.6
作者：
Choudhury, Snehashis;Stalin, Sanjuna;Archer, Lynden A.
通讯作者：
Archer, Lynden A.