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Updated: Mar 24, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Toward the design of high voltage magnesium-lithium hybrid batteries using dual-salt electrolytes
Yingwen Cheng1, Daiwon Choi1, Kee Sung Han2
1Energy Processes and Materials Division, Energy and Environment Directorate Pacific Northwest National Laboratory, Richland, WA 99354, USA. jun.liu@pnnl.gov guosheng.li@pnnl.gov.
Abstract:
We report a design of high voltage magnesium-lithium (Mg-Li) hybrid batteries through rational control of the electrolyte chemistry, electrode materials and cell architecture. Prototype devices with a structure of Mg-Li/LiFePO4 (LFP) and Mg-Li/LiMn2O4 (LMO) have been investigated. A Mg-Li/LFP cell using a dual-salt electrolyte 0.2 M [Mg2Cl2(DME)4][AlCl4]2 and 1.0 M LiTFSI exhibits voltages higher than 2.5 V (vs. Mg) and a high specific energy density of 246 W h kg(-1) under conditions that are amenable for practical applications. The successful demonstrations reported here could be a significant step forward for practical hybrid batteries.
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