journal article·2021-08-23

Composite Hybrid Quasi-Solid Electrolyte for High-Energy Lithium Metal Batteries

Yanfang Zhai, Guanming Yang, Zhong Zeng, Shufeng Song, Shuai Li, Ning Hu, Weiping Tang, Zhaoyin Wen, Li Lu, Janina Molenda

ACS Applied Energy Materials· Volume 4· Issue 8
Publisher page

Abstract

Exploring quasi-solid electrolytes with superior ionic conductivities, wide electrochemical stability window, desirable compatibility toward lithium metal, and facile processability for high-energy lithium metal batteries remains a challenge. In this work, all of these issues are fully addressed via a composite hybrid design, of which poly(ethylene oxide) (PEO) is used as a polymeric host and guarantees the interfacial compatibility toward lithium metal, highly conductive and thermally stable ionogel aims at suppressing PEO crystallization and enhancing conductivity, and garnet conductor enhances mechanical and electrochemical stabilities. Such a composite hybrid design yields the required quasi-solid electrolyte, which not only shows a high ionic conductivity of 7.4 × 10–4 S cm–1 at 25 °C but also extends the electrochemical stability window to 5.5 V vs Li/Li+, demonstrated with the interacted and monolithic structure of the composite hybrid quasi-solid electrolyte by XPS. Moreover, the composite hybrid quasi-solid electrolyte suppresses dendrite growth with a current density up to 0.7 mA cm–2. The quasi-solid Li∥LiNi0.5Co0.2Mn0.3O2 and Li∥LiFePO4 cells using this composite hybrid quasi-solid electrolyte are demonstrated. This study suggests that engineering integration of ionogel, polymer, and inorganic conductor offers an alternative to explore new electrolytes for lithium metal batteries.
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Research context

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Advanced Battery Technologies Research

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Affiliations

College of Aerospace Engineering, Chongqing University, Chongqing 400044, China

Guangdong Provincial Key Laboratory of Energy Materials for Electric Power, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China

State Key Laboratory of Reliability and Intelligence Electrical Equipment, National Engineering Research Center for Technological Innovation Method and Tool, and School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China

State Key Laboratory of Space Power-Sources Technology, Shanghai Institute of Space Power-Sources, Shanghai 200245, China

CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Department of Mechanical Engineering, National University of Singapore, 117575 Singapore

Faculty of Energy and Fuels, AGH University of Science and Technology, Al Mickiewicza 30, 30059 Krakow, Poland

Funding

National Natural Science Foundation of China · National Science and Technology Major Project · Science and Technology Planning Project of Tianjin · Guangdong Provincial Key Laboratory of Energy Materials for Electric Power · Hebei Province

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