journal article·2022-12-09

A Polymer Electrolyte with High Cationic Transport Number for Safe and Stable Solid Li-Metal Batteries

Xinyuan Shan, Madison Morey, Zhenxi Li, Sheng Zhao, Shenghan Song, Zhenxue Xiao, Hao Feng, Shilun Gao, Guoran Li, Alexei P. Sokolov, Emily Ryan, Kang Xu, Ming Tian, Yi He, Huabin Yang, Peng-Fei Cao

ACS Energy Letters· Volume 7· Issue 12
Publisher page

Abstract

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.
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Research context

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin 300350, China

Division of Materials Science and Engineering, Boston University, Boston, Massachusetts 02215, United States

Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States

Department of Chemistry & Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States

Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States

Battery Science Branch, Energy and Biomaterials Division, Sensor and Electron Devices Directorate, US Army Research Laboratory, Adelphi, Maryland 20783-1197, United States

State Key Lab of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China

Experimental Teaching Center of Materials Science, School of Materials Science and Engineering, Nankai University, Tianjin 300350, China

Funding

Natural Science Foundation of Tianjin City · Ministry of Education of the People's Republic of China · Basic Energy Sciences · Boston University · National Natural Science Foundation of China · National Science Foundation

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