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A Polymer Electrolyte with High Cationic Transport Number for Safe and Stable Solid Li-Metal Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-11-08 , DOI: 10.1021/acsenergylett.2c02349
Xinyuan Shan 1 , Madison Morey 2 , Zhenxi Li 1 , Sheng Zhao 3 , Shenghan Song 4 , Zhenxue Xiao 1 , Hao Feng 1 , Shilun Gao 1 , Guoran Li 1 , Alexei P. Sokolov 3, 5 , Emily Ryan 2 , Kang Xu 6 , Ming Tian 7 , Yi He 4 , Huabin Yang 1, 8 , Peng-Fei Cao 7
Affiliation  

The strategies for achieving a high cationic transport polymer electrolyte (HTPE) have mostly focused on developing single-ion conducting polymer electrolytes, which is far from being practical due to sluggish ion transport. Herein, we present an unprecedented approach on designing an HTPE via in situ copolymerization of regular ionic conducting and single-ion conducting monomers in the presence of a lithium salt. The HTPE, i.e., poly(VEC10-r-LiSTFSI), exhibits a combination of impressive properties, including high cationic transport number (0.73), high ionic conductivity (1.60 mS cm–1), tolerance of high current density (10 mA cm–2), and high anodic stability (5 V). A lithium-metal battery constructed with the developed HTPE retains 70% capacity after 1200 cycles at 1 C, and it also operates in a wide temperature range and with a high mass loading of the cathode. Advanced characterizations and computations reveal that the high tLi+ and high ionic conductivity effectively suppress Li0-dendrite growth by circumventing concentration polarizations that plague most polymer electrolytes.

中文翻译:

用于安全稳定的固体锂金属电池的高阳离子传输数聚合物电解质

实现高阳离子传输聚合物电解质(HTPE)的策略主要集中在开发单离子导电聚合物电解质,由于离子传输缓慢,这远非实用。在此,我们提出了一种前所未有的设计 HTPE 的方法,即在锂盐存在下通过常规离子导电单体和单离子导电单体的原位共聚来设计 HTPE。HTPE,即聚 (VEC10- r -LiSTFSI),表现出令人印象深刻的特性组合,包括高阳离子传输数 (0.73)、高离子电导率 (1.60 mS cm –1 )、高电流密度耐受性 (10 mA cm –2), 和高阳极稳定性 (5 V)。用开发的 HTPE 构造的锂金属电池在 1 C 下循环 1200 次后仍能保持 70% 的容量,并且它还可以在很宽的温度范围内工作,并具有高质量的阴极负载。先进的表征和计算表明,高t Li +和高离子电导率通过避免困扰大多数聚合物电解质的浓度极化有效抑制 Li 0 -枝晶生长。
更新日期:2022-11-08
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