Qingdao Energy Institute developed a self-supporting high temperature resistant magnesium battery polymer electrolyte

With the increasing demand for the development of space and underground resources, there is an urgent need to develop special power supplies that can withstand high temperatures (>100°C)
.
However, current commercial lithium-ion batteries usually suffer from significant performance degradation when the operating temperature exceeds 80 °C, and even thermal runaway and explosion occur, resulting in serious safety incidents
.
Magnesium metal exhibits high safety due to its good chemical stability, high melting point (651 °C) and not easy to grow dendrites
.
Based on this, magnesium metal batteries have important application potential in the field of high temperature special power sources
.
However, conventional liquid magnesium electrolytes can only work in a narrow temperature range, so the development of high-temperature-resistant magnesium electrolyte systems is the key to the development of high-temperature magnesium batteries
.

Recently, the team of Cui Guanglei, a researcher at the Qingdao Institute of Bioenergy and Processes of the Chinese Academy of Sciences, cooperated with Qingdao University of Science and Technology and other units to develop a new self-supporting single-ion conductor polymer electrolyte.
The magnesium metal battery assembled with this electrolyte showed excellent high temperature.
Electrochemical performance and safety
.
The self-supporting polymer electrolyte exhibits excellent electrochemical stability with an electrochemical window as high as 4.
8 V (vs.
Mg/Mg ²⁺ )
.
In addition, due to the single-ion conductor-like structure, the magnesium ion migration number of the self-supporting polymer electrolyte reaches 0.
79, which is much higher than that of conventional liquid electrolytes, and the assembled Mg//Mg symmetric battery can perform stable polarization and long cycling.
, and there is no obvious uneven deposition on the surface of the magnesium anode after cycling
.
Due to its high thermal stability and good flame retardancy, the assembled Mo ₆ S ₈ //Mg battery based on this electrolyte can not only perform charge-discharge cycles in a wide temperature range (30-150 °C), but also Demonstrates high security under abuse conditions
.
This work promotes the development of high-temperature, high-safety magnesium batteries and their key materials
.

The related research results were published in Advanced Energy Materials
.
The above work has been supported and funded by the National Natural Science Foundation of China, the Strategic Pilot Science and Technology Project of the Chinese Academy of Sciences, and the Key R&D Program of Shandong Province
.

Qingdao Energy Institute developed a self-supporting high temperature resistant magnesium battery polymer electrolyte